Ratio Calculator
Simplify ratios, scale a ratio up or split a total into parts. Useful for recipes, comparisons, mixtures and quick everyday maths.
Calculate a ratio
Enter two or three parts. You can simplify the ratio, scale it by a multiplier, or split a total amount according to the ratio.
Smallest whole-number version.
Add all simplified ratio parts.
Each part's share of your total.
Every part multiplied equally.
Total divided by total parts.
A quick interpretation.
How the ratio calculator works
A ratio compares amounts in parts. If a recipe uses flour and water in a ratio of 2:3, that means for every 2 parts of flour you use 3 parts of water.
Simplify ratio = divide each part by the greatest common divisor
Scale to total = total ÷ total ratio parts
Each share = ratio part × value per partA proportion keeps the same relationship while the numbers get larger or smaller.
Ratio examples
| Example | Calculation | Result |
|---|---|---|
| Simplify 10:20 | Divide both sides by 10 | 1:2 |
| Split 100 in the ratio 2:3 | Total parts = 5, each part = 20 | 40:60 |
| Scale 3:2:1 to total 60 | Total parts = 6, each part = 10 | 30:20:10 |
When ratios are useful
- Recipes: scale ingredients without changing the balance.
- Shopping: compare quantities alongside the unit price comparison calculator.
- Percentages: convert part-to-whole relationships with the percentage calculator.
- Splitting totals: divide money, time or quantities into fair shares.
Ratio calculator FAQs
How do you simplify a ratio?
Divide every part of the ratio by the largest number that divides evenly into all parts. For example, 10:20 simplifies to 1:2.
How do you split a total into a ratio?
Add the ratio parts together, divide the total by that number, then multiply each ratio part by the value per part.
Can a ratio have three parts?
Yes. Ratios such as 3:2:1 are common in recipes, mixtures and comparisons. The calculator supports two-part and three-part ratios.