Fraction & Rational Number Calculator

Math Updated 16 Jun 2026

Fraction & Rational Number Calculator is a mathematics calculator that helps you calculate the ratio between two numbers in simplified form. The formula used is: Add: (n₁d₂+n₂d₁)/(d₁d₂) · Subtract: (n₁d₂−n₂d₁)/(d₁d₂) · Multiply: n₁n₂/(d₁d₂) · Divide: n₁d₂/(d₁n₂) · Simplify by GCD. Ensure all inputs share the same unit system (e.g. all metres or all feet) unless the formula converts between units.

Formula

Add: (n₁d₂+n₂d₁)/(d₁d₂) · Subtract: (n₁d₂−n₂d₁)/(d₁d₂) · Multiply: n₁n₂/(d₁d₂) · Divide: n₁d₂/(d₁n₂) · Simplify by GCD

Example Calculation

Inputs
  • Numerator 1: 3
  • Denominator 1: 4
  • Numerator 2: 2
  • Denominator 2: 5

Suppose you enter: Numerator 1 = 3, Denominator 1 = 4, Numerator 2 = 2, Denominator 2 = 5. The calculator applies the formula (Add: (n₁d₂+n₂d₁)/(d₁d₂) · Subtract: (n₁d₂−n₂d₁)/(d₁d₂) · Multiply: n₁n₂/(d₁d₂) · Divide: n₁d₂/(d₁n₂) · Simplify by GCD) and shows all output values below. Change any input field to immediately see how the result changes.

Frequently asked questions

What is the Fraction & Rational Number?
The Fraction & Rational Number Calculator is a mathematics calculator that helps you calculate the ratio between two numbers in simplified form. Ensure all inputs share the same unit system (e.g. all metres or all feet) unless the formula converts between units.
When should I use this calculator?
Use this calculator whenever you need a quick, accurate result for the ratio between two numbers in simplified form without working through the arithmetic manually.
What units should I enter?
Ensure all inputs share the same unit system (e.g. all metres or all feet) unless the formula converts between units.
How accurate are the results?
Results are mathematically exact given the formula and your inputs. Rounding to decimal places may introduce small display differences.
How do I interpret the result?
Check that all inputs are in the valid range for the formula. Some operations (e.g. square root, division) require non-negative or non-zero values.
How can I verify the calculation manually?
Use the displayed formula and work through the numbers step by step. If your manual result differs slightly, check rounding and unit conversions first.
Can I use this for planning and budgeting?
Yes. Run best-case, expected, and worst-case inputs to compare outcomes and make safer planning decisions.