Fraction & Ratio Calculator

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Quick Summary

Add, subtract, multiply, and divide fractions with automatic simplification, convert between fractions, decimals, and percents, and scale ratios to any term.

Interactive Client Prototype Sandbox

Result5/6

Mixed: 5/6

Decimal: 0.8333333333

How to use the Fraction & Ratio Calculator

Step-by-Step Guide

Choose Arithmetic, Convert, or Scale Ratio. Enter the numerators and denominators (or a decimal/ratio); the simplified result and its other forms update instantly.

Example1/2 + 1/3 ➔ 5/6 (0.8333); 0.75 ➔ 3/4 (75%); 3:4 scaled to ?:12 ➔ 9:12.

Who it's for

Students, teachers, cooks, woodworkers, and anyone working with fractions or ratios.

Core Features

Add, subtract, multiply, and divide two fractions with automatic lowest-terms simplification.
Show the answer as an improper fraction, a mixed number, and a decimal.
Convert a decimal into a simplified fraction and a percentage.
Scale a ratio so one term hits a target value (e.g. 3:4 → ?:12).

🛡️ No tracking — your inputs, keys, and details never leave this client sandbox.