Free Online Calculators
Fractions +−×÷ with auto-simplification & decimal display
Working with fractions doesn't have to be a headache. Our free fraction calculator handles addition, subtraction, multiplication, and division of fractions in seconds – complete with automatic simplification and a decimal equivalent so you always understand the result. Whether you're a student tackling homework, a parent helping at the kitchen table, or a professional double-checking a quick calculation, this tool makes fraction arithmetic fast and foolproof.
Fractions show up everywhere – recipes, construction measurements, financial ratios, and classroom math. Our calculator is built to handle every common operation you'll need:
Using the calculator is straightforward. Follow these simple steps:
There's no sign-up, no download, and no cost. Just open the page and start calculating.
When you add or multiply fractions, the raw answer often isn't in its simplest form. For example, adding 1/4 and 1/4 gives 2/4 – but the cleanest answer is 1/2. Our calculator automatically applies the greatest common divisor (GCD) algorithm to reduce every result, so you always get the most readable, standardized form of the answer without any extra steps.
To add or subtract fractions, you need a common denominator. The calculator finds the least common denominator (LCD) for you, converts both fractions, performs the operation, and simplifies the result. For example: 2/3 + 1/4 becomes 8/12 + 3/12 = 11/12.
Multiplication is the most straightforward fraction operation. You multiply the numerators together and the denominators together: (a/b) × (c/d) = (a×c)/(b×d). The result is then simplified. For example: 2/3 × 3/5 = 6/15 = 2/5.
Division uses the keep-change-flip method: keep the first fraction, change ÷ to ×, and flip the second fraction. So 3/4 ÷ 2/5 becomes 3/4 × 5/2 = 15/8. Our calculator handles this automatically every time.
Sometimes a fraction like 7/16 is hard to visualize. That's why every result includes a decimal equivalent. Seeing that 7/16 = 0.4375 helps in practical situations – like checking a measurement against a decimal ruler or entering a value into another formula. Both representations are shown side by side so you get the full picture.
You need to find a common denominator first. Our fraction calculator does this automatically – just enter both fractions and select the + operation. It finds the least common denominator, converts both fractions, adds them, and simplifies the result instantly.
Yes. Every result is automatically reduced to its lowest terms. The calculator uses the greatest common divisor of the numerator and denominator to simplify, so you never need to reduce manually.
Mixed numbers aren't entered directly, but you can convert them to improper fractions first. Multiply the whole number by the denominator and add the numerator: 2 1/2 = (2×2+1)/2 = 5/2. Then enter 5 as the numerator and 2 as the denominator.
The decimal display converts the simplified fraction result into its decimal form. For instance, 3/4 displays as 0.75. This helps when you need to use the result in a decimal context or just want a more intuitive sense of the value.
Absolutely. The fraction calculator on Simple Calculator is completely free with no registration required. Open it on any device – desktop, tablet, or smartphone – and calculate as many fractions as you need.