Calculate with fractions

Type two fractions or mixed numbers, choose the operation, and get the answer in lowest terms, as a mixed number and as a decimal, for homework, recipes or measurements.

First number

Like 3/4, 1 1/2, 5 or 0.25

Operation

Second number

Calculations run on this device. We don't see, store or log the numbers you enter.

How it works

Type the first number, for example 3/4 or 1 1/2.
Choose add, subtract, multiply or divide.
Type the second number and read the answer.

Why use this calculator

The answer is always reduced to lowest terms and shown three ways, so you can copy whichever your worksheet or recipe needs. It works on any phone, offline once loaded.

How the answer is worked out

To add or subtract, both fractions are put over a common denominator: 1/2 + 1/3 = 3/6 + 2/6 = 5/6. To multiply, multiply tops and bottoms: 2/3 × 9/10 = 18/30 = 3/5. To divide, multiply by the second fraction turned upside down: 5/8 ÷ 1/4 = 5/8 × 4/1 = 20/8 = 5/2, which is 2 1/2 or 2.5. Mixed numbers are turned into improper fractions first: 1 1/2 is 3/2.

Writing numbers

Use a slash for fractions (3/4), a space between the whole part and the fraction (2 3/4), a minus sign for negatives (−1/2) and a full stop for decimals (0.75, turned into 3/4).

Worked examples

Example calculations, in lowest terms
Calculation	Answer	Mixed number	Decimal
1/2 + 1/3	5/6	5/6	0.8333
3/4 - 1/6	7/12	7/12	0.5833
2/3 × 9/10	3/5	3/5	0.6
5/8 ÷ 1/4	5/2	2 1/2	2.5
1 1/2 + 2 3/4	17/4	4 1/4	4.25

Frequently asked questions

How do I enter a mixed number?

Put a space between the whole number and the fraction: 2 1/3.

Why is my answer an improper fraction?

Both forms are shown: 7/4 is the same as 1 3/4, and 1.75.

Can I divide by zero?

No. Dividing by 0 has no answer, and the calculator says so.

Are my numbers stored?

No. Everything is calculated on your device.

Last reviewed: October 1, 2026