Decimal to Fraction Calculator
Convert a decimal number into a simplified fraction.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
As a fraction
3/4
This tool performs standard mathematical operations for educational and reference purposes. Always double-check results for critical academic or professional work.
About the Decimal to Fraction Calculator
The decimal to fraction calculator converts a decimal number into a fraction in lowest terms. It writes the decimal over a power of ten — one zero for each decimal place — and then divides top and bottom by their greatest common divisor. Terminating decimals convert exactly. Repeating decimals such as 0.333… should be entered with as many digits as you need; the result will be a close fraction rather than an exact one.
How to use it
- 1Enter the decimal number, for example 0.75 or 2.125.
- 2Press Calculate to see the simplified fraction.
Worked example
0.75 = 75/100, and dividing both by 25 gives 3/4. 0.125 = 125/1000 = 1/8. 2.5 = 25/10 = 5/2, or 2 1/2 as a mixed number.
How it works
How it works
The decimal is written over a power of ten based on its number of decimal places, then reduced to lowest terms.
Who it is for
Students and anyone converting measurements, such as decimal inches to fractional inches.
Why it helps
Fractions are often clearer than decimals for measurements and for exact values.
Common use cases
- Converting decimal inches to a fraction for a tape measure
- Checking homework answers
- Converting a percentage to a fraction (0.4 → 2/5)
Frequently asked questions
A:It converts the entered digits exactly; long repeating decimals are approximated by the digits you provide.
Reviewed for accuracy · Last updated October 7, 2026
Calculations use standard, well-established mathematical identities and algorithms with no approximation beyond normal floating-point precision.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
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