Trapezoid Area Calculator
Find the area of a trapezoid from its two parallel sides and height.
Change the values and press Calculate to work out your own figures.
Enter the base a, base b and height.
| Amount | Unit |
|---|---|
| 69.67728 | m² |
| 696,772.8 | cm² |
| 750 | ft² |
| 108,000 | in² |
| 83.33333333 | yd² |
| 0.01721763086 | acres |
Show the working
- A = (a + b) ÷ 2 × h
- Area = 750 ft²
How to use it
Enter the base a, base b and height.
Enter the measurements (decimals, fractions such as 3/4, or mixed numbers such as 1 1/2) and, if you like, their unit; the answer is then also given in other units. Show the working gives the formula.
Key facts
A = (a + b) ÷ 2 × h
The median
The segment joining the midpoints of the legs is the average of the bases; the area is the median times the height.
Questions
What is the area with bases 30 and 45 and height 20?
750.
Is a trapezoid the same as a trapezium?
In the US, yes; in the UK the words are swapped.
Formulas
A = (a + b) ÷ 2 × h
Sources
Limitations
- All measurements in one calculation use the same unit; the answer is also given in other units.
- Measurements up to 10¹⁵.