Ratio Calculator
Simplify ratios, solve proportions (A:B = C:x), divide an amount in a ratio and scale ratios up or down.
About Ratio Calculator
This ratio calculator online handles the common ratio and proportion tasks. Simplify a ratio such as 24:36 to its lowest terms, solve a proportion like A:B = C:x for the missing value, divide an amount in a given ratio, or scale a ratio up or down.
It works with two numbers or three and more, so you can split money between partners, scale a recipe or resize dimensions while keeping the same proportion. It acts as a simplify ratio calculator and a proportion calculator online in one place, with the working shown. It is free, needs no sign-up and runs in your browser.
How to use Ratio Calculator
- Choose what you want to do from the tabs.
- Enter the ratio terms (A:B or A:B:C…) and any other values.
- Read the simplified ratio, missing value or shares.
Frequently asked questions
How do I simplify a ratio?
Divide every term by their HCF. 24:36 → HCF 12 → 2:3. Decimals are first scaled to whole numbers.
How do I solve A:B = C:x?
Cross-multiply: x = B × C ÷ A. For 3:4 = 15:x, x = 4 × 15 ÷ 3 = 20.
How do I divide ₹90,000 in the ratio 2:3:4?
Add the parts (9). Each share = total × part ÷ 9 → ₹20,000, ₹30,000 and ₹40,000.
How do I calculate a ratio between two numbers?
Write the numbers as A:B and divide both by their highest common factor. For example, 15:25 simplifies to 3:5.
What is proportion?
A proportion says two ratios are equal, such as 2:3 = 8:12. If one term is missing, cross-multiply to find it.
Can I simplify a ratio with three numbers?
Yes. Enter all three terms, such as 12:18:24, and the calculator divides each by their common factor to give 2:3:4.
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