Scientific Notation Converter

How to use

1. 1Type any number into the input field. Plain decimals, E notation (1.23e5), spelled-out scientific (1.23 x 10^5), and bare powers of ten (10^9) are all accepted.
2. 2Drag the significant figures slider to round the mantissa, or pick a quick preset (3, 4, 5, 6, 8, 10, 15).
3. 3Toggle E notation case (e vs E) and the exponent sign style (1.23e5 vs 1.23e+5) so the output matches the convention you need.
4. 4Read the four output cards: scientific, E notation, engineering, and the full decimal expansion. Click Copy on any card to grab that form.
5. 5Switch to Batch list to paste one number per line, then copy any output column straight into a spreadsheet or report.

About this tool

Scientific Notation Converter rewrites any number into four common forms at once: scientific notation with a single digit before the decimal point and a power of ten (1.23 x 10^5), E notation that calculators, spreadsheets, and most programming languages print (1.23e5 or 1.23E5), engineering notation where the exponent is always a multiple of three so the prefix lines up with SI units like kilo, mega, giga, milli, micro, and nano, and the standard decimal expansion written out in full. Type any of these forms in the input field and the other three fill in instantly. The parser accepts plain decimals (123.45, 0.000123), e-notation in lower or upper case (1.23e5, 1.23E-7, 1.23e+7), the spelled-out scientific form with a multiplication sign and caret (1.23 x 10^5, 1.23 X 10^5, 1.23 * 10^5), the Unicode multiplication sign and dot operator, bare powers of ten (10^9), thousands separators (1,234,567), and underscore separators for readability (6_022e23). A precision slider rounds the mantissa to between one and fifteen significant figures using banker rounding, with quick presets at 3, 4, 5, 6, 8, 10, and 15 sig figs to match common chemistry, physics, and engineering reporting. Toggle the E case (1.23e5 vs 1.23E5) and the exponent sign style (1.23e5 vs 1.23e+5) so the output matches the convention your assignment, paper, or codebase requires. A breakdown panel shows the sign, mantissa, exponent, and how many significant digits are actually in use, which is handy for homework and lab reports. A batch mode converts a whole list at once: paste one value per line, copy any of the four output columns straight into a spreadsheet, with malformed lines kept and labelled so you can fix them without losing your place. Built-in quick examples cover the constants people most often look up: Avogadro's number, the speed of light, Planck's constant, the electron mass, Earth's radius, an atomic radius, one cent in dollars, and one trillion as a power of ten. Everything runs locally in your browser, so the values you convert here never leave your device.

Free to use. Works in your browser. No signup, no login.