Fraction Calculator
Compute with fractions (and mixed numbers) instantly. Results are simplified, shown as fraction + mixed number + decimal, with clear steps.
Supported: fractions (3/4), mixed (2 1/3), whole (5), decimals (1.25), negatives. Use spaces only for mixed numbers (e.g., “2 1/3”).
Privacy: runs locally in your browser. No inputs are stored or transmitted.
How it works
Fractions are computed exactly using integer arithmetic, then simplified using the greatest common divisor (GCD). Mixed numbers are displayed as: whole + remainder/denominator (when |value| ≥ 1).
- Add/Subtract: a/b ± c/d = (ad ± bc) / bd
- Multiply: (a/b) × (c/d) = (ac) / (bd)
- Divide: (a/b) ÷ (c/d) = (a/b) × (d/c), c ≠ 0
Examples
- 2 1/3 + 3/4 = 3 1/12
- 5/6 − 1/3 = 1/2
- 7/8 × 4 = 3 1/2
- 1 ÷ 2/5 = 2 1/2
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
FAQ
- What inputs does this fraction calculator support?
It supports fractions (e.g., 3/4), whole numbers (e.g., 5), decimals (e.g., 1.25), and mixed numbers (e.g., 2 1/3). You can also use a leading minus sign for negatives.
- Does it simplify fractions automatically?
Yes. Results are reduced to lowest terms using GCD, and mixed-number form is shown when the absolute value is at least 1.
- How does division work for fractions?
Dividing by a fraction means multiplying by its reciprocal. For example, (a/b) ÷ (c/d) = (a/b) × (d/c), provided c ≠ 0.
- What if the denominator is zero?
A denominator of 0 is invalid. The calculator will show an error and no result.
- Are my inputs stored?
No. The calculation runs locally in your browser and does not store or transmit your inputs.