Fraction Calculator

Add, subtract, multiply, or divide any two fractions, mixed numbers, or decimals. Live result shown in mixed, improper, and decimal form. Everything runs in your browser — nothing is uploaded.

Mode

A fraction · mixed · decimal

B fraction · mixed · decimal

Operation Add + Subtract − Multiply × Divide ÷

Result

Mixed —

Improper —

Decimal —

Decimal → exact fraction

Type a decimal, get the closest exact fraction with denominator at most maxDen. Useful for recipes (0.625 cup = 5/8 cup), woodwork (0.75" = 3/4"), and sewing (0.875 yard = 7/8 yard).

Decimal Max denominator

5/8

Quick reference

Decimal	Mixed	Improper	Note
0.125	1/8	1/8	eighth
0.25	1/4	1/4	quarter
0.333…	1/3	1/3	non-terminating
0.375	3/8	3/8	three-eighths
0.5	1/2	1/2	half
0.625	5/8	5/8	five-eighths
0.666…	2/3	2/3	non-terminating
0.75	3/4	3/4	three-quarters
0.875	7/8	7/8	seven-eighths

Accepted input formats

Fraction: 3/4, -5/8, 10/10 (auto-simplified)
Mixed number: 1 1/2, -2 3/4 (a whole number, space, then a fraction)
Decimal: 0.625, 1.5, .5, -0.25 (parsed as the exact decimal, not the IEEE-754 float)
Integer: 3, -7