What is the Ratio Calculator?
A ratio calculator either reduces a pair of positive numbers to the smallest equivalent integer ratio, or solves for a missing value in a proportion where A:B equals C:D (enter either C or D, not both).
Why people use this calculator
Mixing paint, scaling recipes, maps, screen layouts and exam problems all use ratios and proportions.
How to use the Ratio Calculator  summary
- Pick mode: Simplify or solve proportion.
- Enter values: Positive numbers only; follow on-screen hints for solve mode.
- Calculate: Get simplified integers or the missing term.
Tips for best results
Double-check classroom or exam problems with a second method when precision matters. Cross-check loan or investment figures with your bank’s official schedule  small rounding differences are normal between calculators.