Decimal to fraction
Turn a decimal such as 0.125 into an exact fraction such as 1/8. It is useful for measurements, recipes and math homework where a fraction is easier to read than a long decimal.
- Runs in your browser
- Free, no account needed
- Copy or download the result
Result
Example
0.125
Exact fraction: 1/8
How to use the decimal to fraction
- Type a decimal in the box, such as 0.125 or -2.75.
- You can also use e notation, such as 2.5e-3.
- Press Run to see the exact fraction.
- Press Copy result or Download to save it.
How it works
The decimal is written over a power of ten and reduced to lowest terms. 0.125 is 125/1000, which simplifies to 1/8.
The answer is always exact. A whole-number result appears with no denominator, such as 3.
Only decimals that end are supported. Typing 0.333 gives 333/1000, not 1/3, because the tool cannot know the digits were meant to repeat.
Use at most 80 digits and an exponent from -100 to 100. Fractions, commas and text are rejected.
Results are improper fractions, so 2.75 shows as 11/4 rather than a mixed number.
Everything runs in your browser. Your input is not uploaded or stored.
Questions and answers
How do you convert a decimal to a fraction?
Write the digits over 10, 100, 1000 and so on, matching the number of decimal places, then simplify. 0.75 is 75/100, which reduces to 3/4.
What is 0.375 as a fraction?
0.375 is 375/1000, which simplifies to 3/8.
How do I convert a repeating decimal like 0.333...?
This tool only handles decimals that end. A repeating decimal needs a bit of algebra, which shows 0.333... equals 1/3. Typing 0.333 here gives exactly 333/1000.
Can it show a mixed number?
No. The result is an improper fraction, such as 11/4. Divide to get the mixed form: 11/4 is 2 and 3/4.