Scientific notation converter
Convert numbers between decimal, scientific, engineering and SI-prefixed notation.
Scientific notation converter
Paste a list of numbers, one per line, and this tool converts every value between decimal notation (0.000123), scientific notation (1.23e-4) and engineering notation (123e-6). It also reads and writes SI-prefixed values such as "123 µ", so a batch of measurements in mixed formats becomes consistent in one pass.
The target format option picks what every line is rewritten as. Significant digits controls how much precision the output keeps, from 1 to 20 digits, applied consistently whether the result lands in decimal or exponential form. The multiplication sign option covers how an exponent is written: a plain "e", an uppercase "E", the more formal "× 10^n" with a caret, or "× 10⁻ⁿ" with true Unicode superscript characters, matching whatever convention your document or spreadsheet expects. Decimal separator switches between a period and a comma for the fractional part, useful when the result is heading into a locale that writes numbers the European way.
Each line is treated as one value, so pasting a column exported from a spreadsheet converts the whole batch at once; a line that isn't a recognised number — a header, a label, a stray word — is left untouched and counted separately, rather than breaking the conversion. Input can already be in decimal, scientific, engineering or SI-prefixed form, with either a period or a comma as the decimal point, and Windows and Unix line endings are handled the same way.
Everything runs locally in your browser — no number is ever sent anywhere. Copy the result, download it as a .txt file, or send the output straight back into the input to apply another format on top.