Rex says
The fast lane for the math you almost remember from school. Type the numbers, get the answer, move on with your day.
Try a scenario
Click to load — tweak from there.Inputs
Result
Simplified
5/6
Decimal
0.833333
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter numerator 1.
- 2Enter denominator 1.
- 3Enter operation.
- 4Enter numerator 2.
- 5Enter denominator 2.
- 6Read your simplified on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Enter two fractions and an operation — get the simplified result and decimal value.
Worked example
Using the values the calculator loads with:
Inputs
- Numerator 1: 1
- Denominator 1: 2
- Operation: Add (+)
- Numerator 2: 1
- Denominator 2: 3
Results
- Simplified: 5/6
- Decimal: 0.833333
What each field means
Inputs
- Numerator 1
- The numerator 1 used in the calculation. Starts at 1 so you have a working example on load.
- Denominator 1
- The denominator 1 used in the calculation. Starts at 2 so you have a working example on load.
- Operation
- Pick the option that matches your situation — the maths changes per option. Choices: Add (+), Subtract (−), Multiply (×), Divide (÷).
- Numerator 2
- The numerator 2 used in the calculation. Starts at 1 so you have a working example on load.
- Denominator 2
- The denominator 2 used in the calculation. Starts at 3 so you have a working example on load.
Results
- Simplified
- Returned as a plain value and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Decimal
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the fraction calculator work?
Enter two fractions and an operation — get the simplified result and decimal value.
What do I need to enter?
5 values: numerator 1, denominator 1, operation, numerator 2, and denominator 2. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the simplified result mean?
It is returned as a plain value and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are rounded for display; the underlying calculation keeps full precision.
Who is this tool for?
It's built for students, developers, and anyone who needs the answer right now without setting up a spreadsheet.
Accuracy and limitations
- Results are rounded for display; the underlying calculation keeps full precision.
- Very large or very small inputs may hit floating-point limits in the browser.
- Inputs outside the accepted range are clamped rather than rejected.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Fraction Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/fraction
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/fraction" target="_blank" rel="noopener">Fraction Calculator — RevenueLab</a> (2026).</p>
Source: [Fraction Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/fraction) (2026).