Scientific Notation Calculator
Convert numbers to scientific notation and back, or multiply them.
All calculations happen locally in your browser — nothing is uploaded, stored or tracked.
Pick a mode
To scientific, from scientific, or multiply.
Enter the number or parts
As needed for the mode.
Read the result
With engineering notation too.
What Is Scientific Notation?
Scientific notation writes numbers as a coefficient between 1 and 10 multiplied by a power of ten: 6.02 × 10²³. It is the standard way to write very large and very small numbers in science — the mass of an electron, the distance to a galaxy.
This calculator converts any number into scientific notation and engineering notation (where the exponent is a multiple of three, matching SI prefixes), converts back from coefficient and exponent, and multiplies two numbers written in scientific notation.
How Conversion Works
The conversion moves the decimal point until one non-zero digit remains to its left, counting the places moved as the exponent — positive for large numbers, negative for small ones.
Your data never leaves your device.
Every calculation on this site runs in your browser using vanilla JavaScript. Nothing is uploaded, stored or tracked.
- 100% local, client-side calculations
- No data stored on any server
- No tracking, no analytics, no ads scripts
- Works offline once loaded
Frequently Asked Questions
How do I write 0.0005 in scientific notation?
5 × 10⁻⁴. The decimal point moves four places to the right, so the exponent is −4.
What is engineering notation?
Scientific notation where the exponent is always a multiple of 3 (like SI prefixes: kilo, mega, milli). 0.0005 becomes 500 × 10⁻⁶.
What is a mantissa?
The coefficient in front of the power of ten — between 1 and 10 in normalized scientific notation.
How do I multiply numbers in scientific notation?
Multiply the coefficients and add the exponents: (2×10³) × (3×10⁴) = 6×10⁷.
Can it handle very large numbers?
Yes — up to the limits of standard floating point, roughly 10³⁰⁸.