Perimeter of a Triangle with Fractions Calculator

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Choose whether to calculate the perimeter or find a missing side length.
The whole-number part of side a. Enter 0 for a pure fraction.
The numerator of the fractional part of side a.
The denominator of the fractional part of side a.
The whole-number part of side b.
The numerator of the fractional part of side b.
The denominator of the fractional part of side b.
The whole-number part of side c.
The numerator of the fractional part of side c.
The denominator of the fractional part of side c.
Perimeter (fraction)
4 181/280

Exact result as a simplified mixed number or fraction

Perimeter (decimal)4.646429
Side a2 1/5
Side b4/7
Side c1 7/8
Common denominator (LCD)280

Perimeter = 4 181/280

  • The three sides are 2 1/5, 4/7, and 1 7/8.
  • The least common denominator of the three side fractions is 280, so all three sides are converted to that denominator before the numerators are added.
  • The exact perimeter is 4 181/280, which equals approximately 4.6464 in decimal form.

Next stepTo verify: convert all sides to decimals, add them, and compare to the decimal result shown above.

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