Fraction Calculator
Add, subtract, multiply or divide fractions and reduce to lowest terms.
About this calculator
Fractions follow different rules for each operation, which is exactly why they're worth a dedicated tool. This calculator takes two fractions and any of the four operations, then returns the result already reduced to lowest terms along with its decimal value.
The rules it applies: to add or subtract, you need a common denominator, so the fractions are cross-multiplied onto a shared bottom before combining the tops. To multiply, you simply multiply straight across, top times top and bottom times bottom. To divide, you flip the second fraction and multiply — the classic 'keep, change, flip'. Every answer is then simplified by dividing both parts by their greatest common divisor.
Fractions, decimals and percentages are three views of the same thing, so this pairs naturally with the percentage calculator for everyday problems and the unit converter when you're scaling recipe or measurement quantities up and down.
Frequently asked questions
How do I add two fractions?
Give them a common denominator, add the numerators, then simplify. For example, 1/2 + 1/3 becomes 3/6 + 2/6 = 5/6.
How do I divide fractions?
Flip the second fraction and multiply — 'keep, change, flip'. So 1/2 ÷ 1/3 = 1/2 × 3/1 = 3/2.
How is the answer simplified?
The calculator divides the numerator and denominator by their greatest common divisor, reducing the fraction to lowest terms automatically.