What this calculator does
A ratio such as 2 : 3 compares parts. A fraction compares a part with the whole. This tool adds the parts, writes each one over the total and simplifies, so 2 : 3 becomes 2/5 and 3/5.
How to use it
- Enter your ratio.
- Press Convert.
- See each fraction in lowest terms, with the working.
The method
- Add all the parts to get the whole.
- Write each part over the whole.
- Simplify each fraction by dividing top and bottom by their greatest common divisor.
3 : 5 : 2 ⇒ whole = 10 ⇒ 310, 510 = 12, 210 = 15
Examples you can try
| Ratio | Fractions |
|---|---|
| 2 : 3 | 2/5 and 3/5 |
| 1 : 1 | 1/2 and 1/2 |
| 3 : 5 : 2 | 3/10, 1/2 and 1/5 |
| 1 : 3 | 1/4 and 3/4 |
Ratio or fraction?
People often mix these up. In the ratio 2 : 3, the first part is 2 out of 5 in total, not 2/3. Our guide on ratio vs fraction explains the difference with more examples.
Tips
- If you only want the ratio in simplest form, use the simplify calculator.
- For percentages instead of fractions, use the ratio to percentage calculator.
Want to learn the method?
Ratio vs fraction: what is the difference?Read our short guide with worked examples you can follow on paper.
Frequently asked questions
How do you convert a ratio to a fraction?
Add the parts to get the whole, then write each part over the whole and simplify.
Is the ratio 2:3 the same as the fraction 2/3?
No. As fractions of the whole, 2 : 3 gives 2/5 and 3/5. The fraction 2/3 compares 2 with 3 directly.
What is 1:4 as a fraction?
1/5 and 4/5.
Can I convert a ratio with three parts?
Yes, up to four parts.
Are the fractions always in lowest terms?
Yes, the calculator simplifies them.