Scientific Notation Converter
Convert any number to and from scientific and engineering notation instantly — runs 100% in your browser with no upload.
🔒 Converted in your browser — nothing is uploaded.
What this tool does
Type a plain decimal number and see it rewritten in scientific notation, or type scientific notation and see the plain decimal value — both fields stay in sync as you type. Scientific notation writes a number as a mantissa between 1 and 10 multiplied by a power of ten, so 1234 becomes 1.234e3 (meaning 1.234 × 10³) and 0.0005 becomes 5e-4. The converter also shows engineering notation, a variant where the exponent is always a multiple of three (so 12345 becomes 12.345e3), which lines up neatly with metric prefixes like kilo, mega and micro — and the tool shows that prefixed form directly, so 12345 reads as 12.345 k and 0.000123 as 123 µ. It handles zero, negative numbers and very large or very small values without losing precision.
How to read the e-notation
The letter e stands for "times ten to the power of", so 6.022e23 means 6.022 × 10²³ and 9.11e-31 means 9.11 × 10⁻³¹. A positive exponent shifts the decimal point to the right (a bigger number), while a negative exponent shifts it to the left (a smaller number). When entering scientific notation you can use the compact e form (1.23e4), an uppercase E (1.23E4), or a written-out style like 1.23 × 10^4 — the tool understands all of them and converts to a clean, unambiguous result.
Frequently asked questions
What is the difference between scientific and engineering notation?
Both express a number as a value times a power of ten. Scientific notation keeps the mantissa between 1 and 10, so 12345 is 1.2345e4. Engineering notation forces the exponent to be a multiple of three so it matches metric prefixes, so the same number is 12.345e3, which reads naturally as 12.345 thousand.
How do I type a very small number like 0.00000123?
Just type 0.00000123 into the decimal field and the scientific field will show 1.23e-6. You can also type it the other way around: enter 1.23e-6 in the scientific field and the decimal value appears automatically.
Is my number sent to a server?
No. The number you enter never leaves your device. All conversion runs entirely in your browser with JavaScript — nothing is uploaded, logged, or stored.