Fraction to decimal
Convert a fraction such as 3/8 into a decimal such as 0.375. When the decimal goes on forever, like 1/3, the tool rounds it to the number of places you choose and labels it as rounded.
- Runs in your browser
- Free, no account needed
- Copy or download the result
Result
Example
1/3
Rounded to 12 decimal places: 0.333333333333
How to use the fraction to decimal
- Type a fraction in the Fraction box, such as 1/3 or -7/8.
- Pick 6, 12, 20 or 40 places under Decimal places.
- Press Run. The result is labeled Exact decimal or Rounded to your chosen number of places.
- Press Copy result or Download to keep it.
How it works
The tool divides the top number by the bottom number using whole-number arithmetic, so there is no floating point error.
If the decimal ends within your chosen places, the result says Exact decimal. Otherwise it says Rounded to N decimal places.
Rounding goes to the nearest digit, and exact halves round away from zero. Trailing zeros are removed.
Repeating decimals are rounded, not shown with a repeat bar. For example, 1/3 at 6 places is 0.333333.
A zero denominator is rejected. Each part of the fraction can have up to 80 digits.
Everything runs in your browser. Your input is not uploaded or stored.
Questions and answers
How do you convert a fraction to a decimal?
Divide the numerator, the top number, by the denominator, the bottom number. 3/8 means 3 divided by 8, which is 0.375.
Why does 1/3 not give an exact decimal?
1/3 is 0.3333... with 3s that never end. Any fraction in lowest terms whose denominator has a prime factor other than 2 or 5 repeats forever, so the tool rounds it.
What is 2/3 as a decimal?
It is 0.6666... repeating. Rounded to 6 places, this tool shows 0.666667.
Can I enter an improper fraction or a negative?
Yes. 7/4 gives 1.75 and -1/8 gives -0.125.