Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions. Your work stays on this device whenever possible.
How to use Fraction Calculator
- Fill the first group with the whole part, numerator and denominator of Fraction 1; leave the whole box at 0 for a plain fraction.
- Choose +, −, × or ÷ in the operator selector between the two groups.
- Fill Fraction 2 the same way, keeping both denominators non-zero.
- Press 'Calculate Fraction' to see the mixed number, the decimal, the percentage and the step-by-step box.
- Use 'Simplify Fraction 1 Only' to reduce the first fraction alone, or 'Reset' to restore the 1 3/4 and 2 1/2 starting values.
Worked example
Add 1 3/4 and 2 1/2. Improper forms are 7/4 and 5/2. The least common denominator is 4, so the terms become 7/4 and 10/4, and their sum is 17/4. That is already reduced, so the tool reports 4 1/4 (17/4), decimal 4.25 and percentage 425%.
When to use this tool
- Scaling a recipe that calls for 1 3/4 cups of flour by adding another 2 1/2 cups for a bigger batch.
- A carpenter subtracting a 5/8 inch offset from a 2 1/4 inch board width.
Important limitations
Calculations require integer numerators and non-zero integer denominators. Irrational numbers or floating-point decimals within fraction terms must be represented as rational whole integers.
Comparing alternatives
Other options for fraction calculator include Calculator.net, Omni Calculator, Mathway.
ToolkitPoint is not affiliated with those services.
Frequently asked questions
How do I enter a negative mixed number?
Put the minus sign in the whole box: whole -1 with numerator 3 and denominator 4 is read as -7/4. For a negative proper fraction, leave whole at 0 and type the negative numerator instead.
Can I type decimals such as 0.5?
No. The boxes are converted with BigInt, which only accepts whole numbers, so a decimal stops the calculation without a message. Rewrite 0.5 as 1/2 before entering it.
What does 'Simplify Fraction 1 Only' ignore?
It skips the operator and Fraction 2 entirely. It converts the first fraction to improper form, divides by the greatest common divisor, and shows the mixed number with a four-digit decimal, so 18/24 becomes 3/4.
Why is the reduction step sometimes missing?
The 'Reduce using GCD' line is printed only when the greatest common divisor exceeds 1. If the raw answer is already in lowest terms, the list stops after the operation step.
Are large numerators exact?
Yes for the fraction itself, because BigInt has no digit limit. The decimal and percentage lines convert through ordinary numbers, so beyond about 15 digits those two figures are approximate.