The full index
Every calculator & converter
227 free tools across 18 subjects.
227 calculators shown
Time & Date25
Open section- Add Working Days CalculatorThe date that's N business days from a date, skipping weekends and holidays.
- Age CalculatorYour exact age in years, months and days — and days to your next birthday.
- Bearing & Heading CalculatorTrue and magnetic bearing between two points — or where a bearing and distance take you.
- Countdown & Elapsed Time CalculatorTime left until an event — or time since it happened.
- Date Add/Subtract CalculatorAdd or subtract days, weeks, months, years or working days from a date.
- Date Difference CalculatorExact years, months and days between two dates — plus weeks, working days and hours.
- Date Information CalculatorWeekday, ISO week number, day of year and more for any date.
- Date-Time Format ConverterConvert a date between ISO 8601, RFC 2822, Unix, Excel, US and Indian formats.
- Deadline & Notice Period CalculatorThe last day of a notice period, deadline or limitation period.
- Duration ConverterConvert durations between seconds, minutes, hours, days, weeks and HH:MM:SS.
- Flight Duration EstimatorRoughly how long a flight between two cities takes.
- Great-circle Distance CalculatorThe shortest distance between two places on Earth — 'as the crow flies'.
- Light Travel Time CalculatorHow long light (or a radio signal) takes to cover a distance.
- Overtime Pay CalculatorOvertime hours and pay under Indian, US federal or California rules.
- Recurring Dates GeneratorList every date of a repeating schedule — weekly, monthly, 2nd Tuesday and more.
- Running & Walking Pace CalculatorYour pace per km and mile, speed, and predicted race times.
- Shift Rotation PlannerA day-by-day roster for 2-2-3, DuPont, 4-on-4-off or your own rotation.
- Speed, Distance & Time CalculatorSolve for speed, distance or time — in any units, with pace and arrival time.
- Time Calculator — Add and Subtract Hours, Minutes and SecondsAdd and subtract times in h:mm:ss, multiply or divide a time, or find the time between two clock times — even across midnight.
- Time Zone ConverterConvert a time across time zones on cards you can add, remove, reorder and swap — DST handled.
- Travel Time Calculator (with Stops)How long a road trip takes with breaks — and when you'll arrive.
- Unix Timestamp ConverterConvert Unix epoch time to and from human-readable dates.
- Work Hours & Timesheet CalculatorTotal hours worked from start and end times, with breaks, overtime and pay.
- Working Days CalculatorBusiness days between two dates, excluding weekends and holidays.
- World Clock & Meeting PlannerSee one moment in several cities and find meeting hours that suit everyone.
Finance & Investment69
Open section- Absolute Return & ROI CalculatorTotal return on an investment, including income and costs.
- Asset Allocation CalculatorA starting split between equity, debt and gold for your age, risk and horizon.
- Average Cost Calculator (Stocks & Mutual Funds)Average buy price across several purchases, and what it takes to average down.
- Beta & Correlation CalculatorHow much a stock or fund moves with the market: beta, correlation, R² and alpha.
- Bond Duration & Convexity CalculatorHow sensitive a bond's price is to interest rates.
- Bond Price & Yield (YTM) CalculatorA bond's fair price from its yield — or its yield to maturity from the price.
- Budget Planner (50/30/20 Rule)Split your take-home pay into needs, wants and savings.
- CAGR CalculatorCompound Annual Growth Rate between a starting and ending value.
- Capital Gain CalculatorProfit on selling shares, funds, gold or property — and whether it's short or long term.
- Child Education PlannerHow much to invest for your child's higher education.
- Compound Interest CalculatorSee how money grows with compounding, at any frequency.
- Cost-Benefit Ratio CalculatorDiscounted benefits divided by discounted costs — is the project worth it?
- Credit Card Payoff CalculatorHow long to clear your credit card dues — or what to pay each month to clear them by a date.
- Currency-adjusted Return CalculatorYour real return on foreign investments, in your own currency.
- Debt Snowball & Avalanche CalculatorPay off several debts faster: snowball vs avalanche, month by month.
- Debt-to-Income (DTI) Ratio CalculatorWhat share of your income goes to loan payments — the number lenders check.
- Direct vs Regular Mutual Fund CalculatorHow much more you keep in a direct plan than in a regular plan.
- Discount Calculator — Sale Price & Percent OffSale price after a discount, the % off between two prices, or the original price — with stacked offers and tax.
- Dividend Yield & Total Return CalculatorDividend yield, yield on cost, income and total return on a stock.
- Emergency Fund CalculatorHow big your emergency fund should be, and how long it takes to build.
- EPF CalculatorProvident Fund balance at retirement at the 8.25 % EPF rate.
- Equity vs Debt Calculator (Post-tax)Equity fund, debt fund or FD — which leaves you more after Indian tax?
- Exit Load CalculatorThe exit load on a mutual fund redemption — and whether waiting is worth it.
- Expense Ratio & Fee Impact CalculatorHow much a fund's expense ratio costs you over the years.
- FD Calculator — Fixed Deposit Interest & MaturityMaturity value and interest on a fixed deposit — cumulative or monthly/quarterly payout, with TDS.
- FIRE Calculator (Financial Independence, Retire Early)Your FIRE number and how many years until you can stop working.
- Flexible SIP CalculatorSIP that changes over time: raise, cut, pause or top up — phase by phase.
- Fund vs Benchmark ComparisonDid your fund beat its benchmark? By how much a year, and how consistently?
- Goal-based Investment PlannerHow much to invest monthly (or once) to reach a future goal.
- Inflation CalculatorFuture cost of today's expenses, and what money will be worth later.
- IRR & NPV CalculatorNet present value, internal rate of return, payback and profitability index for any cash flows.
- Life Insurance Cover CalculatorHow much term cover your family needs — and how much more to buy.
- Lumpsum Investment CalculatorFuture value of a one-time investment at an expected annual return.
- Market-cap Allocation CalculatorYour equity split across large, mid and small caps.
- Marriage Goal PlannerPlan the savings for a wedding years from now.
- Maximum Drawdown CalculatorThe worst peak-to-trough fall in a price or NAV history, and how long recovery took.
- Mutual Fund Portfolio Consolidation CalculatorToo many funds? See the overlap, your average expense ratio and what consolidating saves.
- Net Worth CalculatorEverything you own minus everything you owe.
- NPS Calculator (National Pension System)NPS corpus at 60, the lump sum you can take, and your monthly pension.
- Portfolio Concentration CalculatorHow concentrated your portfolio is: top-holding shares, HHI and effective number of holdings.
- Portfolio Rebalancing CalculatorExactly how much to buy or sell to get back to your target allocation.
- Portfolio Volatility CalculatorExpected return and risk of a mix of assets, with the benefit of diversification.
- Portfolio Weights & Allocation CalculatorEach holding's weight and your mix by asset class, sector or any grouping.
- Post-tax Return CalculatorWhat you keep after tax — and why when the tax is paid matters.
- PPF CalculatorPublic Provident Fund maturity at today's 7.1 % rate, with extensions.
- Project ROI CalculatorReturn on investment for a business project, campaign or purchase.
- RD Calculator — Recurring Deposit & SavingsWhat a monthly recurring deposit grows to — or how much to save each month for a goal.
- Real Estate Investment Return CalculatorThe true return on a property you buy, rent out and sell — loan, costs and all.
- Real Return Calculator (Inflation-adjusted)What an investment really earns after inflation — and after tax.
- Rent Affordability Calculator — How Much Rent Can I Afford?The rent your income supports under the 30 % rule, 50/30/20 or the 40× rule — plus move-in cash and a check of any rent.
- Rent vs Buy CalculatorShould you buy a home or rent and invest the difference? Your net worth both ways, year by year.
- Rental Yield CalculatorGross and net rental yield of a property, after costs and vacancy.
- Rolling Returns CalculatorHow a fund performed over every 1-, 3- or 5-year period — not just one lucky window.
- Sector Allocation CalculatorHow your stocks are spread across sectors — and where you're concentrated.
- Sharpe Ratio CalculatorReturn earned per unit of risk — compare two funds fairly.
- Simple Interest CalculatorInterest on the principal only: I = P × R × T.
- SIP CalculatorProject the future value of a monthly SIP, with optional step-up.
- SIP Exit Load CalculatorExit load on redeeming SIP units — instalment by instalment, oldest first.
- SIP vs Lumpsum CalculatorInvest a sum all at once, or spread it out? Compare both, fairly.
- Sortino Ratio CalculatorRisk-adjusted return that only penalises the bad months.
- Step-up SIP CalculatorSIP returns when you raise the instalment every year.
- Stock Intrinsic Value CalculatorA share's fair value by DCF, dividend discount, Graham number or P/E — and your margin of safety.
- STP CalculatorMove a lump sum from a debt fund into equity in monthly instalments.
- Sukanya Samriddhi Yojana (SSY) CalculatorMaturity value of a Sukanya Samriddhi account at 8.2 %.
- SWP CalculatorMonthly income from a mutual fund: what's left, and how long it lasts.
- Time Value of Money (TVM) SolverSolve for FV, PV, payment, number of periods or rate — like a financial calculator or Excel.
- Tip & Bill Split Calculator — Tip, Tax and Each Person's ShareAdd a tip (and tax) to a bill and split it equally or by what each person ordered, with rounding.
- Tracking Error & Tracking Difference CalculatorHow closely a fund follows its benchmark — and how much it lags or leads.
- XIRR CalculatorAnnualised return on irregular investments and withdrawals (SIPs, top-ups, redemptions).
Loans & Debt14
Open section- APR Calculator — True Cost of a LoanThe real yearly rate after processing fees and charges — and what a 'flat rate' really costs.
- Car Loan Calculator — On-road Price, EMI & Total CostFrom ex-showroom price to on-road price, loan, EMI and the car's true total cost.
- Debt Consolidation CalculatorWould one new loan beat your cards and loans? Compare the EMI, total interest and debt-free date.
- Dynamic Loan Payment CalculatorModel a loan whose rate, EMI or balance changed over time.
- Education Loan Calculator — Moratorium Interest, EMI, Subsidy & Tax SavingEMI after the course and grace period, the interest that builds up while you study, subsidies and the tax deduction on interest.
- EMI PlannerCalculate your monthly EMI from loan amount, rate, and tenure.
- EMI-to-Tenure Planner"I can pay ₹41,000/month — how long will my loan take?"
- Home Affordability & Down Payment Calculator — How Much House Can I Afford?The home price your income and savings support — loan, EMI, down payment and stamp duty — or what a given home needs.
- Loan Amortization ExplorerFull month-by-month loan payoff schedule, with optional extra payments.
- Loan Capacity Calculator"If I can pay ₹50,000/month, how much can I borrow?"
- Loan Health Check"I've already paid 74 EMIs — how much do I still owe?"
- Loan Transfer Analyzer"Another bank is offering a lower rate — should I switch?"
- Prepayment Optimizer"I have ₹5 lakh — should I reduce my EMI or finish the loan earlier?"
- Target Tenure EMI Planner"I want to finish my loan in 10 years — what EMI do I need?"
Retirement Planning14
Open section- 401(k) CalculatorYour 401(k) at retirement — with your employer's match, 2026 IRS limits and catch-ups.
- Annuity / Pension CalculatorThe pension a lump sum buys from an insurer — and what it's really worth.
- EPF & NPS Withdrawal Tax CalculatorHow much tax you pay when you withdraw your EPF or exit NPS.
- EPS Pension Calculator (EPS-95)Your monthly pension from the Employees' Pension Scheme, at 58 or earlier/later.
- Gratuity Calculator (India)Gratuity on leaving a job or retiring: 15 days' wages for every year of service.
- Monte Carlo Retirement SimulatorThe chance your retirement money lasts when markets go up and down.
- Retirement Age Optimizer"At what age can I realistically retire?"
- Retirement Corpus Planner"How much money will I need when I retire?"
- Retirement Gap Analyzer"How much am I short of my retirement target?"
- Retirement Income CalculatorHow much monthly income your retirement corpus can safely pay.
- Retirement Money Lifespan Planner"If I withdraw this much every month, how long will my money last?"
- Retirement Readiness Planner"Am I on track to retire?" — the flagship retirement calculator.
- Retirement Savings Planner"How much should I save every month to reach my retirement goal?"
- Senior Citizens' Savings Scheme (SCSS) CalculatorQuarterly income from SCSS at 8.2 %, for 5 years (or 8 with extension).
Salary & Tax5
Open section- GST Calculator — Add or Remove GSTAdd GST to a price or take it out — with CGST/SGST or IGST split and multi-item invoices.
- Income Tax Calculator (India) — Old vs New RegimeYour income tax for FY 2026-27 under both regimes — and which one saves more.
- Salary Calculator — CTC to In-hand (India)Turn your CTC into monthly take-home pay: PF, gratuity, professional tax and income tax.
- Sales Tax CalculatorAdd sales tax to a price, or find the price before tax from a total.
- VAT Calculator — Add or Remove VATAdd VAT to a price or extract it from a VAT-inclusive price, at any rate.
Mathematics29
Open section- Area Calculator — Any ShapeArea and perimeter of squares, triangles, circles, sectors, ellipses, polygons and more — with the formula.
- BODMAS CalculatorSolve any expression in BODMAS order, with every step shown.
- Circle Calculator — Radius, Diameter, Circumference, Area, Arc & SectorKnow one of radius, diameter, circumference or area? Get all the others — plus arc length, sector, chord and segment for an angle.
- Confidence Interval Calculator — Mean or Proportion, Margin of ErrorConfidence interval and margin of error for a mean (t or z) or a proportion (Wilson and normal), at 80–99.9 % confidence.
- Exponent, Root & Logarithm CalculatorPowers (aᵇ), n-th roots, logarithms in any base, and solving aˣ = y — with the working and big answers in scientific notation.
- Factor Calculator — All Factors, Factor Pairs & Prime FactorisationEvery factor of a number, its factor pairs and prime factorisation — and whether it's prime, perfect or a square.
- Fraction CalculatorAdd, subtract, multiply, divide, and simplify fractions.
- LCM & GCF Calculator (HCF)Least common multiple and greatest common factor (HCF) of any list of numbers, with prime factors and steps.
- Long Division Calculator — Steps, Remainder & Repeating DecimalsLong division worked step by step, with the quotient and remainder and the exact decimal — repeating digits marked.
- Matrix Calculator — Multiply, Determinant, Inverse, TransposeAdd, subtract and multiply matrices, or find a matrix's determinant, inverse, transpose, rank and powers — up to 8 × 8.
- Number Sequence Calculator — Arithmetic, Geometric & FibonacciThe n-th term and the sum of arithmetic, geometric and Fibonacci-type sequences — or find the pattern from a few terms.
- P-Value Calculator — From z, t or Chi-squareThe p-value for a z-score, t-statistic or chi-square statistic — one- or two-tailed — and whether it's significant at your α.
- Percentage CalculatorX% of Y, percentage change, what-percent-is-X-of-Y, percent error and percent difference.
- Permutation & Combination Calculator (nPr, nCr)nPr and nCr — ways to arrange or choose r items from n, with or without repetition, exactly.
- Probability Calculator — Two Events, Binomial & At Least OnceProbability of A and B, A or B, neither and conditional; binomial 'exactly k of n'; and the chance of at least one success in n tries.
- Quadratic Equation SolverSolve ax² + bx + c = 0 — real or complex roots, vertex, factored form and graph, step by step.
- Random Number Generator & Dice RollerFair random numbers in a range (with or without repeats), dice like 2d6+3, coin flips, and random picks or shuffles from a list.
- Ratio CalculatorSimplify a ratio, or solve a proportion for a missing value.
- Right Triangle & Pythagoras CalculatorSolve a right-angled triangle from two parts — legs, hypotenuse or an angle — with Pythagoras' theorem shown.
- Rounding Calculator — Decimal Places, Significant Figures & Nearest MultipleRound exactly to decimal places, significant figures or the nearest 10, 100, 0.05… with half-up, banker's, ceiling, floor or truncate.
- Sample Size Calculator — Surveys and StudiesHow many people to survey (or measure) for a chosen margin of error and confidence — with a finite-population correction.
- Scientific CalculatorTrigonometric, logarithmic, exponential, and power functions.
- Scientific Notation Converter — Standard Form, E-notation & EngineeringConvert numbers to and from scientific notation (a × 10ⁿ), E-notation and engineering notation with SI prefixes — exactly.
- Slope, Distance & Midpoint Calculator — Line Through Two PointsFrom two points: slope, distance, midpoint, angle and the line's equation in slope-intercept and standard form.
- Statistics CalculatorMean, median, mode, standard deviation and variance for a data set — or a weighted average.
- Surface Area Calculator — Cube, Cylinder, Cone, Sphere & MoreTotal surface area of cubes, cuboids, cylinders, cones, spheres, pyramids and more — with the formula worked through.
- Triangle Calculator — Solve Any Triangle (SSS, SAS, ASA, AAS, SSA)Solve a triangle from three known parts: all sides and angles, area, perimeter, heights, in- and circumradius — both answers for the ambiguous SSA case.
- Volume Calculator — Any SolidVolume and surface area of cubes, cylinders, cones, spheres, pyramids, tanks and pipes — in litres too.
- Z-Score & Normal Distribution Calculator — Percentile and ProbabilityZ-score of a value, its percentile and the area below, above or between values on a normal curve — or the value at a percentile.
Developer / IT5
Open section- Base64 Encoder / DecoderEncode text to Base64 or decode Base64 back to text.
- Binary & Hex Calculator — Arithmetic, Bitwise AND/OR/XOR & ShiftsAdd, subtract, multiply and divide binary, octal, hex or decimal numbers, plus AND, OR, XOR, NOT and bit shifts — with two's complement.
- Number Base ConverterConvert between binary, octal, decimal, and hexadecimal.
- Password Generator — Strong Random PasswordsStrong random passwords made in your browser — with strength in bits and estimated cracking time.
- URL Encoder / DecoderPercent-encode or decode URLs, query values and form data — and break a URL into its parts.
Networking6
Open section- Baud Rate CalculatorConvert bit rate to baud (and back) for BPSK, QPSK and QAM, or work out real UART serial throughput from baud, data bits, parity and stop bits.
- Data Transfer Rate ConverterConvert Mbps to MB/s, Gbps, KB/s, MiB/s and more, with the working shown and how long a file takes.
- IP Subnet CalculatorCalculate network address, broadcast address, usable host range, and more.
- Network Latency CalculatorPropagation delay and ping (RTT) over fibre, copper, radio or satellite, bandwidth-delay product, and real transfer time.
- Streaming Bitrate CalculatorThe video bitrate, upload speed and data per hour a live stream needs, for your resolution, frame rate, motion and codec.
- Uptime & SLA Calculator — Allowed Downtime for Any Number of NinesTurn an uptime SLA like 99.9 % into allowed downtime per year, month, week and day — or downtime back into uptime.
Data & Storage2
Open sectionEngineering3
Open section- Ohm's Law Calculator — Voltage, Current, Resistance & PowerKnow any two of voltage, current, resistance and power? Get the other two, with the working.
- Resistor Colour Code Calculator — 4, 5 & 6 BandRead a resistor's value from its 4, 5 or 6 colour bands — or find the bands for a value, with the nearest standard E24/E96 value.
- Voltage Drop Calculator — Cable Size, Length & Power LossVoltage drop and power loss in a cable run — single-phase, three-phase or DC, copper or aluminium, mm² or AWG — and the size you need.
Health & Fitness21
Open section- BMI CalculatorBody Mass Index from your height and weight.
- BMR & TDEE CalculatorCalories you burn a day (BMR and TDEE) — and how much to eat to lose, keep or gain weight.
- Body Fat CalculatorBody fat % from a tape measure (US Navy method) or from BMI — with fat mass, lean mass and category.
- Body Surface Area (BSA) Calculator — Mosteller, Du Bois & MoreBody surface area in m² from height and weight — Mosteller, Du Bois, Haycock and Gehan & George side by side.
- Calorie Calculator — Calories to Lose or Gain WeightHow many calories a day to lose (or gain) weight safely — and how long it will take.
- Calories Burned Calculator — Walking, Running, Cycling, Yoga & MoreCalories burned by 40 activities — walking, running, cycling, swimming, yoga, cricket, housework — from the 2024 Compendium MET values.
- Carbohydrate Calculator — Daily Carbs in GramsHow many grams of carbohydrate to eat a day for your calories and diet style.
- Conception Date Calculator — When Did I Conceive?Estimate when conception happened from a due date, birth date, last period or IVF transfer — with the likely fertile window.
- eGFR Calculator — Kidney Function (CKD-EPI 2021)Estimated glomerular filtration rate from serum creatinine, age and sex with the race-free CKD-EPI 2021 equation, and the CKD stage.
- Fat Intake Calculator — Daily Fat in GramsHow many grams of fat to eat a day for your calories and diet style.
- Ideal Weight & Healthy Weight CalculatorYour healthy weight range for your height (WHO or Asian Indian BMI) and four classic ideal-weight formulas.
- Lean Body Mass Calculator — Boer, James, Hume or Body-Fat %Lean body mass (everything except fat) from height and weight by the Boer, James or Hume formula — or from your body-fat percentage.
- Macro Calculator — Protein, Carbs & FatDaily grams of protein, carbohydrate and fat for your calories and diet style — per day and per meal.
- One Rep Max (1RM) Calculator — 7 Formulas and Training LoadsEstimate your one-rep max from a weight and reps (Epley, Brzycki and 5 more), with training loads at each % of 1RM.
- Ovulation Calculator — Fertile Window and Next PeriodsYour likely ovulation day and six-day fertile window, plus your next periods and when to take a pregnancy test.
- Period Calculator — Next Period Dates and Cycle TrackerWhen your next period is due, the next six period dates, and where you are in your cycle today.
- Pregnancy Due Date Calculator — Week by WeekYour due date from your last period, conception or IVF transfer — how far along you are and what's next.
- Pregnancy Weight Gain Calculator — Healthy Range by WeekHow much weight to gain in pregnancy for your pre-pregnancy BMI — the total, the range for this week, and how you're tracking.
- Protein Calculator — How Much Protein Do You Need?Your daily protein in grams — by body weight or as a share of calories — and per meal.
- Sleep Calculator — Bedtime and Wake-up Times by Sleep CyclesWhen to go to bed to wake up between sleep cycles — or when to set the alarm for your bedtime — with recommended hours for your age.
- Target Heart Rate Calculator — Training Zones and Max Heart RateYour maximum heart rate and target zones for moderate and vigorous exercise — by % of max or the Karvonen (heart-rate reserve) method.
Business3
Open section- Commission Calculator — Flat, Tiered, Quota, Draw & Total PaySales commission at a flat or tiered rate, with quota, cap, split, base pay and draw — or the sales you need for a target.
- Depreciation Calculator — SLM, WDV, Declining Balance, SYD & Income-tax RatesYear-by-year depreciation and book value by straight line, WDV, double declining, sum of digits, units — or Indian income-tax block rates.
- Profit Margin & Markup CalculatorMargin, markup and profit from any two of cost, price, margin % and markup % — with tax and quantity.
Unit Converters15
Open section- Angle ConverterConvert angles between degrees, radians, gradians, arcminutes, arcseconds, turns and mils.
- Area ConverterConvert between square meters, square feet, acres, hectares, and more.
- Astronomical Distance ConverterConvert between light-years, parsecs, astronomical units and kilometres.
- Currency Converter — Your Rate, Bank Markup, Fees & GSTConvert money at the rate you enter and see what a bank or card markup, fees and GST really cost you.
- Energy ConverterConvert energy between joules, calories, kcal, kWh, BTU, therms, electronvolts and more.
- Fuel Economy Converter — km/L, L/100 km, mpg (US & UK)Convert fuel economy between km per litre, litres per 100 km and miles per gallon (US and UK).
- Length ConverterConvert between meters, feet, inches, miles, kilometers, and more.
- Power ConverterConvert power between watts, kW, horsepower (hp and PS), BTU/h and tons of refrigeration.
- Pressure ConverterConvert pressure between psi, bar, kPa, atm, kg/cm², mmHg and more — tyres, gas, weather and blood pressure.
- Roman Numeral Converter — Numbers ⇄ Roman NumeralsConvert numbers to Roman numerals and back — 1 to 3,999, and up to 3,999,999 with the bar (vinculum) for thousands.
- Shoe Size Converter — UK, India, US, EU and Foot LengthConvert adult shoe sizes between UK/India, US men's, US women's and EU — or find your size from your foot length.
- Speed ConverterConvert between km/h, mph, m/s, and knots.
- Temperature ConverterConvert between Celsius, Fahrenheit, and Kelvin.
- Volume ConverterConvert between liters, gallons, cups, milliliters, and more.
- Weight ConverterConvert between kilograms, pounds, ounces, and more.
Home & Construction7
Open section- AC Size Calculator — BTU & TonnageWhat size air conditioner a room needs, in BTU and tons — sun, people, kitchen and ceiling height included.
- Concrete Calculator — Volume, Cement Bags, Sand & AggregateHow much concrete for a slab, column or stairs — and the cement bags, sand and aggregate for it.
- Electricity Bill & Appliance Cost CalculatorUnits (kWh) your appliances use and the monthly bill — with flat or slab tariffs.
- Gravel, Sand & Mulch Calculator — Volume, Tonnes, Brass & BagsHow much gravel, sand or mulch for an area and depth — in cubic yards, m³, brass, tonnes and bags, with cost.
- Square Footage & Plot Area CalculatorArea of rooms, homes and plots in sq ft, sq m, gaj, cents, guntha, acres and bigha — with cost.
- Stair Calculator — Risers, Treads, Run, Angle & StringerNumber of steps, exact riser height, total run, slope and stringer length — checked against India's NBC or the US IRC.
- Tile & Flooring Calculator — Tiles, Boxes, Skirting, Grout & CostHow many tiles and boxes for a floor or wall — with grout joints, laying pattern, skirting, grout and cost.
Travel & Vehicles2
Open sectionScience & Weather5
Open section- Density Calculator — Density, Mass & VolumeSolve ρ = m ÷ V for density, mass or volume in any units, with common material densities and specific gravity.
- Half-Life Calculator — Radioactive Decay, Remaining Amount & Carbon DatingExponential decay N = N₀(½)^(t/T): remaining amount, starting amount, elapsed time (carbon dating) or the half-life itself.
- Heat Index, Wind Chill & Dew Point Calculator — Feels-like TemperatureFeels-like temperature from temperature, humidity and wind: heat index, wind chill and dew point (or humidity from dew point).
- Molar Mass Calculator — Molecular Weight, Composition & Grams ⇄ MolesMolecular weight of any formula — brackets and hydrates included — with % composition and grams ⇄ moles ⇄ molecules.
- Molarity & Dilution Calculator — Mass to Weigh, C₁V₁ = C₂V₂Molarity from mass and volume, the mass to weigh for a solution, dilutions with C₁V₁ = C₂V₂, and % w/v ⇄ molarity.
Education2
Open section- Final Grade Calculator — Score Needed on the Final & Weighted GradeWhat you need on the final exam to reach a target grade — or your overall grade from weighted assignments, tests and exams.
- GPA & CGPA Calculator (with CGPA to Percentage)SGPA/GPA from your courses, CGPA across semesters, and CGPA to percentage — 10-point and 4.0 scales.