Mathematics · Basics
Scientific Notation Converter — Standard Form, E-notation & Engineering
Turn any number into scientific notation (standard form), E-notation and engineering notation with its SI prefix, or turn scientific notation back into an ordinary decimal. Optionally round to a number of significant figures. Works exactly on the digits, however large or small the number.
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Scientific Notation
4.5067 × 10⁻⁵
0.000045067 · 5 significant figures
- E-notation
- 4.5067e-5
- Engineering Notation
- 45.067 × 10⁻⁶ — prefix µ (micro)
- Decimal
- 0.000045067
- Order of Magnitude
- 10⁻⁵
How this is calculated
x = a × 10ⁿ with 1 ≤ |a| < 10 · engineering: n a multiple of 3
- n
- Places the decimal point moves (positive for big numbers)
Scientific notation writes a number as a value between 1 and 10 times a power of ten: move the decimal point until one non-zero digit is in front of it and count the moves. 0.000045067 becomes 4.5067 × 10⁻⁵. Engineering notation uses powers that are multiples of 3, matching SI prefixes like kilo, micro and nano.
Assumptions & sources
- Exact decimal conversion; numbers more than 60 digits long are shown only in notation.
- 1Mathematics, Classes 6–11 — Number systems, exponents, sequences and series — NCERT
- 2SI prefixes (including ronna, quetta, ronto, quecto, 2022) — BIPM — The International System of Units
Calculator ID MATH-SCINOT-001 · version 1.0.0
Common questions
What is 0.000045 in scientific notation?
4.5 × 10⁻⁵ — the decimal point moves 5 places to the right.
What's E-notation?
The computer way of writing it: 4.5e-5 means 4.5 × 10⁻⁵.
What's the difference between scientific and engineering notation?
Engineering notation uses exponents in multiples of 3, so 45 × 10⁻⁶ (45 micro) instead of 4.5 × 10⁻⁵.