Math & Education
Ratio & Proportion Calculator
Simplify a ratio and solve the missing value in a proportion.
Ratio simplifier
Reduce both sides to the smallest equivalent ratio
Equivalent ratios preserve the same relationship. A proportion solves one missing value by cross multiplication.
Simplified ratio
16:9About this tool
A straightforward ratio & proportion calculator
Simplify a ratio and solve the missing value in a proportion. Simplify mode removes a common scale from both sides; proportion mode solves any selected missing position by cross multiplication.
Decimal ratio simplification is normalized to six decimal places before reduction. Inputs are processed in your browser, and changing a value updates the result immediately.
How it works
Use the Ratio & Proportion Calculator in three steps
- 1Enter your values
Choose whether to simplify a ratio or solve a proportion, then enter the clearly labeled values.
- 2Check the setup
Choose the units or calculation mode that matches your situation.
- 3Use the result
See the reduced ratio, decimal relationship, percentage, completed proportion, and scale factor.
Common questions
Ratio & Proportion Calculator FAQ
How does the Ratio & Proportion Calculator work?
Simplify mode removes a common scale from both sides; proportion mode solves any selected missing position by cross multiplication.
What information do I need?
Choose whether to simplify a ratio or solve a proportion, then enter the clearly labeled values.
How accurate is the result?
Decimal ratio simplification is normalized to six decimal places before reduction.