Turn any decimal into a fraction in simplest form (repeating decimals too), turn a fraction back into a decimal, or simplify a fraction.
How to turn a decimal into a fraction
- Count the digits after the decimal point. 0.375 has three.
- Write the digits over 1 followed by that many zeros: 375/1000.
- Simplify by dividing the top and bottom by their greatest common factor (125): 375/1000 = 3/8.
Repeating decimals
A decimal that repeats forever is still a fraction. For one repeating digit, put it over 9: 0.333… = 3/9 = 1/3. For two repeating digits, use 99: 0.272727… = 27/99 = 3/11. Type them here with brackets around the repeating part, like 0.(27).
Common decimals as fractions
| Decimal | Fraction | Decimal | Fraction |
|---|
| 0.1 | 1/10 | 0.6 | 3/5 |
| 0.125 | 1/8 | 0.625 | 5/8 |
| 0.2 | 1/5 | 0.666… | 2/3 |
| 0.25 | 1/4 | 0.75 | 3/4 |
| 0.333… | 1/3 | 0.8 | 4/5 |
| 0.375 | 3/8 | 0.875 | 7/8 |
| 0.4 | 2/5 | 0.9 | 9/10 |
| 0.5 | 1/2 | 1.5 | 3/2 = 1 1/2 |
How we checked this
Before every update, this calculator is run in a real browser with these known answers, and it must match all of them:
- 0.375 = 3/8 ✓
- 0.333… (typed 0.(3)) = 1/3 ✓
- 5/8 = 0.625 ✓
Last checked October 26, 2026. Spotted something wrong? The math is done in your browser with the formula shown on this page, so you can check any result by hand.
Questions people ask
What is 0.75 as a fraction?
3/4. Write 75/100 and divide the top and bottom by 25.
What is 0.3 repeating as a fraction?
1/3. One repeating digit goes over 9: 3/9, which simplifies to 1/3.
How do you convert a fraction to a decimal?
Divide the top by the bottom. 5/8 = 5 ÷ 8 = 0.625.
What does simplest form mean?
The top and bottom have no common factor other than 1. 18/24 isn't in simplest form because both divide by 6; 3/4 is.