Math & Proportions
Turn a numbers question into a clear result. Choose a tool, enter your values, and see how the calculation works.
Tools in this collection
- Aspect Ratio Calculator — Simplify image dimensions to an aspect ratio and calculate a matching width or height for resizing, with explicit whole-pixel rounding.
- Fraction Calculator — Add, subtract, multiply, and divide two fractions with exact simplified results and an approximate decimal for checking your work.
- Percentage Calculator — Calculate percentages, increases, decreases, and differences for everyday decisions.
- Permutation & Combination Calculator — Count ordered arrangements and unordered selections of distinct items without repetition, using exact integers for up to 100 items.
- Ratio Calculator — Simplify a two-part whole-number ratio and divide a total proportionally, with clear shares for planning, scaling, and study.
- Right Triangle Calculator — Find a missing right-triangle side, area, perimeter, and acute angles from two legs or a hypotenuse and one leg in matching units.
- Unit Converter — Convert common length, mass, temperature, area, volume, and speed units locally.
Choose the right kind of calculation
Use Fraction Calculator for arithmetic on two rational numbers. Use Ratio Calculator to simplify a two-part proportion and share a total. Aspect Ratio Calculator applies proportions specifically to whole-pixel image dimensions.
Right Triangle Calculator applies the Pythagorean theorem only to triangles with a right angle. Permutation & Combination Calculator counts selections of distinct items without repetition.
Keep exact and approximate results separate
Simplified fractions and selection counts are exact integers. Decimal shares, triangle measurements, and resized dimensions may be rounded. Read the result notes before using them in another calculation.
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