Ratio calculator
Simplify a ratio to its lowest terms, or solve a proportion for a missing value — instantly, in your browser.
Simplify a ratio
:
Simplified · decimal
2 : 3 · 0.667
Solve a proportion (A : B = C : x)
:=:
x
15
Frequently asked questions
How do I simplify a ratio?
Divide both numbers by their greatest common divisor. For 8:12, the GCD is 4, so it simplifies to 2:3. This tool does the GCD for you.
How do I solve a proportion?
For A:B = C:x, cross-multiply: x = B × C ÷ A. For example, 2:3 = 10:x gives x = 3 × 10 ÷ 2 = 15. Enter three values and leave the missing one blank.
What is a ratio as a decimal?
Divide the first number by the second. 3:4 as a decimal is 3 ÷ 4 = 0.75.
Is my data uploaded?
No. TryCalculatingNow calculates in your browser. Nothing you type leaves your device.