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Developer/Fraction Calculator

Fraction Calculator

Add, subtract, multiply, and divide fractions — simplified, as a mixed number, and as a decimal, with step-by-step working.

STEP-BY-STEPAll 4 operationsMixed numbersSimplifiesStep-by-step
Der RechnerPage 1
First fraction
⁄
Second fraction
⁄
17/12Simplified result
As mixed number1 5/12
As decimal1.416667
Unsimplified17/12
Step-by-step working
  1. LCD of 3 and 4 is 12
  2. 2/3 = 8/12 and 3/4 = 9/12
  3. 8 + 9 = 17 → 17/12
  4. The fraction 17/12 is already in lowest terms (GCD = 1)
How this works
2/3 + 3/4 = 17/12

Add/subtract: rewrite both fractions over the Least Common Denominator (LCD), then combine numerators.

Worked example

You entered 2/3 + 3/4.

  1. Unsimplified:17/12
  2. Simplified:17/12
  3. Mixed number:1 5/12
  4. Decimal:1.416667
Privacy: Everything is computed in your browser — no data leaves your device.
Data Source & Legal Disclaimer
Effective: Standard arithmetic rulesLast updated: 8 months agoUpdate: Manual review
Sources: Khan Academy — Fractions

All calculations run locally in your browser. Results use exact integer arithmetic and are reduced by the greatest common divisor.

See all data sources & update policy →
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