Solve ratios and proportions (A:B = C:D), simplify ratios and scale recipes or images.
What is the Ratio Calculator?
Find a missing value in a proportion like 4 : 6 = 10 : x, simplify ratios such as 12 : 18 to 2 : 3, and convert to 1 : n form. Useful for recipes, maps, mixing, image sizes and exam questions.
How to use the Ratio Calculator
- Enter three values and leave one box empty.
- Read the missing value.
- See the simplified ratio below.
Frequently asked questions
How do I solve a proportion?
Cross-multiply: if A/B = C/D then D = B × C ÷ A.
This ratio calculator is 100% free, needs no signup and runs in your browser, so your data stays private.
Last updated: · By NodifyTech