Ratio Calculator
Simplify ratios, scale them up and solve for a missing value.
Simplified ratio
3 : 4 : 5
18 : 24 : 30
Total parts
12
Part 1 share
25.00%
Part 2 share
33.33%
Part 3 share
41.67%
Divide every part by their greatest common divisor.
| Part | Original | Simplified | Percentage |
|---|---|---|---|
| 1 | 18 | 3 | 25.00% |
| 2 | 24 | 4 | 33.33% |
| 3 | 30 | 5 | 41.67% |
What does Ratio Calculator do?
Simplify a ratio to its lowest terms, convert it to a percentage split, or solve a proportion where one value is unknown. Handles ratios with two or more parts, which is what recipes and mixes usually need.
How to Use Ratio Calculator
- 1Enter the ratio partsTwo or more whole numbers.
- 2Pick a modeSimplify, convert to percentages, scale, or solve for a missing value.
- 3Read the resultThe simplified form and percentage split are shown together.
Key Features
- Simplify ratios with two, three or more parts
- Convert each part to a percentage of the whole
- Solve proportions where one of four values is unknown
- Scale a ratio to a target total, which is how recipes are resized
- Aspect ratio mode for screen and image dimensions
Frequently Asked Questions
How do I simplify a ratio?
Divide every part by their greatest common divisor. 18:24:30 all divide by 6, giving 3:4:5.
How do I convert a ratio to a percentage?
Add the parts to get the whole, then divide each part by that total. For 3:2, the total is 5, so the split is 60% and 40%.
How do I solve a proportion?
Cross-multiply. For 3:4 = 9:x, multiply 4 × 9 and divide by 3 to get x = 12. The solver mode does this for whichever value you leave blank.
How do I scale a recipe?
Enter the original quantities as the ratio parts and set the target total. Each ingredient is scaled by the same factor, which keeps the proportions exact.
Explore Related Workflows & Utilities
More tools in Calculators and related problem-solving tools
Direct Workflow Extensions
Add, subtract, multiply and divide fractions with the steps shown.
Solve every common percentage question in one place.
Mean, sum and count from any list of numbers.
Find the lowest common multiple and highest common factor.
Convert length, weight, temperature, volume, speed and more.
Find the sale price, the amount saved and the real discount.
Complementary Utilities across Categories
Topical Deep Dives & Guides
Popular Related Searches for Ratio Calculator
Everything you enter here is processed on your own device. Nothing is uploaded to a server, so there is nothing for us to store or log.
Related Tools
Fraction Calculator
Add, subtract, multiply and divide fractions with the steps shown.
Percentage Calculator
Solve every common percentage question in one place.
Average Calculator
Mean, sum and count from any list of numbers.
LCM and HCF Calculator
Find the lowest common multiple and highest common factor.