Ratio Calculator
Simplify ratios and solve proportions instantly with one ratio calculator.
Simplify ratios or solve proportions.
1 : 2
About the ratio calculator
How this calculator works
Ratios are useful when you care about relative size rather than standalone numbers. That comes up in recipes, drawings, scaling, model building, and performance comparisons.
This page combines ratio simplification with a direct proportion solver so you can handle both common workflows from the same interface.
Where it is useful
A ratio page is especially handy when the relationship between values matters more than the exact totals.
Because the calculator shows the reduced ratio and the solved value, it is useful for both quick checks and explainable reference work.
- Reduce ratios for classroom math, recipes, and comparisons.
- Solve missing-value scale problems in drawings or plans.
- Check whether two ratios are equivalent before sharing results.
Example calculations
3 examples4 : 8
1 : 2
6 : 9
2 : 3
2 : 5 = 8 : x
x = 20
Common uses
3 ideas- Reduce ratios for classroom math, recipes, and comparisons.
- Solve missing-value scale problems in drawings or plans.
- Check whether two ratios are equivalent before sharing results.
FAQ
3 answersHow does the simplify-ratio mode work?
The simplify mode reduces both numbers by their greatest common divisor so the ratio is shown in lowest terms.
What does the proportion mode calculate?
Proportion mode solves a:b = c:x using cross multiplication, which makes scaling problems much faster.
Can the ratio calculator use decimals?
Simplify mode expects whole numbers. Proportion mode can use decimal values for the entered ratio and third value.