Subtract Fractions Calculator
Enter the numerators and denominators of two fractions to subtract them.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
To subtract one fraction from another, a/b − c/d, this calculator converts both to a common denominator (the least common multiple of b and d), subtracts the numerators, and reduces the result to lowest terms by dividing out the greatest common divisor — equivalent to the cross-multiplication shortcut (ad − bc) ÷ bd.
The result is shown as a simplified fraction, its decimal equivalent, and — when the numerator exceeds the denominator — a mixed number, so the answer is ready to use however you need it. Students checking homework and anyone doing measurements in recipes, woodworking, or sewing that mix fractional units use it to subtract quantities without manually finding a common denominator.
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