Proportion Calculator
Proportion solver — enter known values to find the unknown, supporting both A:B = C:D and A/B = C/D forms.
Scale a value by a ratio — enter the original value and scaling ratio to compute the scaled result.
Reduce a ratio to its simplest integer form.
Features
The proportion calculator provides three common proportion calculation features to quickly solve proportion-related problems.
- Proportion Solver: Given three of A:B = C:D, automatically find the fourth
- Proportion Scaling: Scale a value by a specified ratio
- Proportion Simplifier: Reduce a ratio to its simplest integer form
Usage Instructions
Features
The proportion calculator integrates proportion solving, scaling and simplifying — find the fourth value from three known values in A:B=C:D, scale values by a ratio, or reduce a ratio to simplest integers.
Steps
In "Proportion Solver", enter any three of A, B, C, D (leave the unknown blank) and click "Solve"; or in "Proportion Scaling", enter the original value and the old/new ratios to compute the scaled result; or in "Proportion Simplifier", enter two numbers to reduce to the simplest integer ratio.
Notes
All calculations run locally in the browser; denominators cannot be zero when solving; the simplifier supports decimal-to-integer conversion and results keep up to 8 decimal places.