Fractions Calculator
Fraction Arithmetic Calculator
Basic arithmetic with fractions is essential and applies to ratios, proportions, and proba...
Read MoreFraction/Decimal Converter Calculator
Convert a fraction to a decimal or a decimal to a fraction.
Read MoreFraction Comparison Calculator
Compare two fractions and see which is larger, with both rewritten over a common denominat...
Read MoreGCD & LCM Calculator
Uses the Euclidean algorithm to find the greatest common divisor (GCD) and least common mu...
Read MoreAbout This Category
Fractions, decimals and the greatest common divisor are the same subject seen from three angles. The calculator pages keep the exact fraction alongside the decimal, because rounding early is how a correct method produces a wrong answer.
Comparing two fractions can be done two ways: convert to a common denominator and compare the numerators, or divide and compare the decimals. The comparison page shows both, which is useful when a fraction is close to another.
Frequently Asked Questions
Why does 1/3 not equal 0.333?
Because 0.333 is a rounded decimal. The fraction is exact; the decimal repeats forever. For any later multiplication the fraction gives the precise result.
When do I need the LCM rather than the GCD?
The GCD reduces a single fraction; the LCM finds a common denominator for several. Reduce first, then find the LCM, and the numbers stay small.
How do I compare 7/9 and 5/7 quickly?
Cross-multiply: 7 × 7 = 49 against 5 × 9 = 45, so 7/9 is larger. This avoids converting to decimals and keeps the exact values.
Calculators in This Category
Sources & last update
2026-10-19