Spike's Calculators

Area and Perimeter

Scalene Trapezium

Spike VM

Calculate the area and perimeter of a scalene trapezium (trapezoid). A scalene trapezium is a shape where two different length bases run parallel to each, and the connecting legs have different lengths.

This calculator can be used for different types of trapeziums (isosceles, right-angled, obtuse) when you know the length of all four sides.

Scalene trapezium = all sides having a different length, and the four angles are unequal.

Scalene Trapezium

Scalene Trapezium Area and Perimeter

Base Length a m
Base Length b m
Length Leg c m
Length Leg d m
Decimal Precision


Height of the of the Trapezium m
Area of the Trapezium
Square Metres
Square Feet ft²
Square Inches in²
Perimeter of the Trapezium
Metres m
Feet ft
Inches in


  1. enter the length of base a in metres
  2. length of base b in metres
  3. the length of leg c in metres
  4. length of leg d in metres
  5. decimal precision, the number of digits after the decimal point


  1. the height of the trapezium in metres
  2. the area of the scalene trapezium in square metres
  3. the area in square feet
  4. the area in square inches
  5. the perimeter of the scalene trapezium in metres
  6. the perimeter in feet
  7. the perimeter in inches
0.5hy= √(s(s-c)(s-d)(s-y))
A = (a+b)/2*h
P = a+b+c+d
where h is the height of the trapezium 
y the length of the base = b  a
s = 0.5(c+ d + y)
a is the short base length
b the long base length
c the length of a leg
d the length of the other leg
A is the area
P the perimeter of the trapezium 

one metre (m) = 3.28083989501312 feet (ft)
one metre (m) = 39.3700787401575 inches (in)
one square metre (m²) = 10.7639104167097 square feet (ft²)
one square metre (m²) = 1550.0031000062 square inches (in²)
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