Practical tools for measured work
Fraction calculator
Convert decimals and mixed numbers to exact fractions and perform fraction arithmetic.
Calculate the layout, check the diagram, then print the result for the shop or jobsite.
How it works
Enter fractions such as 1/3, decimals such as 0.25, or mixed numbers such as −2 1/3 using a keyboard minus sign. Decimal input is converted exactly to an integer fraction before arithmetic. For example, 1/3 + 1/6 = 1/2 and 0.1 + 0.2 = 3/10.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Fraction operation
- Add
- First fraction or decimal
- 1/3
- Second fraction or decimal
- 1/6
Primary result: Reduced fraction: 1/2.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
Use at most 100 digits per integer or decimal part. Scientific notation and expressions are not accepted. Denominators and divisors cannot be zero. Mixed numbers apply the leading sign to the whole quantity.
Frequently asked questions
Are the displayed decimals exact?
Fractions, combinations and integer multiples use exact integer arithmetic. Other results use floating-point arithmetic and are rounded for display. Keep the exact fraction when a repeating decimal matters.
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