// Numbers
Decimal ↔ Scientific Notation
Convert between decimal, scientific, E notation and engineering notation — instantly
by
CHUNKY
MUNSTER
MUNSTER
Scientific notation expresses any number as a coefficient (1 ≤ c < 10) multiplied by a power of 10. For example: 0.00045 = 4.5 × 10⁻⁴ and 123,000 = 1.23 × 10⁵. It keeps very large and very small numbers manageable.
Like scientific notation but the exponent is always a multiple of 3, matching SI metric prefixes: 10³ = kilo, 10⁶ = mega, 10⁹ = giga, 10⁻³ = milli, 10⁻⁶ = micro. So 45,000 = 45 × 10³ in engineering notation.
E notation is the computer-friendly form: 1.23E5 means 1.23 × 10⁵. Used in spreadsheets, programming languages, and calculators to avoid superscripts.
Significant figures are the meaningful digits in a number — they indicate the precision of a measurement. 1.23 × 10⁵ has 3 significant figures. Use the dropdown to control how many sig figs appear in the output.