Spike's Calculators

Area and Perimeter

Isosceles Trapezoid

Spike VM

Calculate the area and perimeter of an isosceles trapezoid. In an isosceles trapezoid, the base length angles are equal, making both side legs equal in length.
This calculator uses feet and or inches for measurements

Isosceles trapezoid = equal base angles with two legs (sides) of equal length.

Isosceles Trapezoid

Isocles Trapezoid Area and Perimeter

Base a ft in n
Base b ft in n
Height ft in n
Decimal Precision


Length of Leg c ft
Area of the Trapezoid
Decimal Square Feet ft²
Square Feet ft² in²
Decimal Square Inches in²
Square Inches in²
Square Metres
Perimeter of the Trapezoid
Decimal Feet ft
Feet ft in
Decimal Inches in
Inches in
Metres m


  1. enter the length of base a in feet and or inches
  2. length of base b in feet and or inches
  3. the height of the trapezoid in feet and or inches
  4. decimal precision, the number of digits after the decimal point


  1. the length of leg c in decimal feet
  2. the area of the isosceles trapezoid in decimal square feet
  3. area in square feet and inches
  4. the area in decimal square inches
  5. the area in square inches
  6. the area in square metres
  7. the perimeter of the isosceles trapezoid in decimal feet
  8. the perimeter in lineal feet and inches
  9. the perimeter in decimal inches
  10. the perimeter in inches
  11. the perimeter in metres
A = (a+b)/2*h
P = a+b+ 2 legs
where A is the area
a is a base length
b the other base length
h the height of the trapezoid
P the perimeter of the trapezoid

one square foot ( ft²) = 144 square inches (in²)
one square inch (in²) = 0.00694444444444443 square feet (ft²)
one square foot ( ft²) = 0.09290304 square metres (m²)
square inch (in²) = 0.00064516 square metres (m²)
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