Scientific notation calculator

Convert a number to scientific notation (a × 10ⁿ) and back to decimal form.

Scientific notation

1.23 × 10⁻⁴

Mantissa1.23

Exponent-4

How the calculation works

In scientific notation, a number becomes a × 10ⁿ, with a between 1 and 10. The exponent n counts how many places the decimal moved. E.g. 0.000123 = 1.23 × 10⁻⁴.

Frequently asked questions

How to write Avogadro's number?

6.022 × 10²³ — or 6.022e23 in calculator form.

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Updated on June 18, 2026 · by Rafael Rossi · Methodology & sources