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Convert numbers to and from scientific, E and engineering notation, round to significant figures, and count significant figures — exactly, without floating-point error.
Also covers: Standard form converter · E notation converter · Engineering notation · Significant figures calculator
Reads plain numbers, E notation (4.52e-4) and “× 10^” forms, including superscripts. Conversions work on the digits themselves, so nothing is lost to floating-point rounding. Rounding is half away from zero.
Scientific notation
4.52 × 10^−4
Forms
452 µ (SI prefix)
Significant figures
3
Exponent
-4
Order of magnitude
10^-4
Plain (0.000452), E notation (4.52e-4) or × 10^ form.
Set significant figures, or leave it blank to keep the digits you typed.
Move the decimal point until one non-zero digit is left of it, and count the moves as the power of ten: 45,200 = 4.52 × 10⁴ and 0.000452 = 4.52 × 10⁻⁴.
A text form of scientific notation: 4.52e-4 means 4.52 × 10⁻⁴. Calculators and programming languages use it.
Scientific notation with the exponent a multiple of 3, so it lines up with SI prefixes: 4.52 × 10⁻⁴ = 452 × 10⁻⁶ = 452 µ.
It's ambiguous — 2, 3 or 4. Write 1.5 × 10³, 1.50 × 10³ or 1.500 × 10³ to be clear.
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