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# Fraction calculator

Turn decimals into fractions and back, simplified.
Exact rationals. 0.1 is 1/10, never the float's nearest guessInsert sampleClearDecimal, fraction, or mixed number

Enter a decimal, fraction, or mixed number.

- Decimals parse as exact rationals (fraction.js): 0.1 is 1/10 exactly, no floating-point rounding anywhere in the pipeline.
- Fractions reduce to lowest terms with the sign on the numerator; the gcd row shows what the reduction divided out of your typed digits.
- Improper fractions also read as mixed numbers ("4/3" and "1 1/3" are the same number, both shown).
- Decimal expansions are exact, with repeating digits in parentheses. 0.(3) is 1/3 forever, not "0.3333333333".
- Scientific notation (1e-3) is refused, with the plain form suggested: a refusal beats a silent re-reading.

## More unit & math tools

- [Unit converter](/converters/units)
- [Primes, GCD, and LCM](/converters/primes)
[All unit & math tools](/converters)

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Canonical HTML: https://nutter.tools/converters/fractions/
Markdown version: https://nutter.tools/converters/fractions/index.md
Plain-text version: https://nutter.tools/converters/fractions/index.txt
Agent index: https://nutter.tools/llms.txt