Area Calculator
The following are calculators to evaluate the area of 7 most common shapes. The area of other shape usually can be obtained by cutting it into many simple shapes and adding the areas up. This calculator is especially useful for estimating the land area.
Rectangle
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Triangle
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Use the triangle calculator to convert if you only know other parameters of a triangle instead of the length of the three edges. |
Trapezoid
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Circle
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Sector
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Ellipse
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Parallelogram
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Reference
Area Formulas of Simple Shapes
Rectangle Area
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total area = lw
Where l is length and w is width
Triangle Area
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total area = (s(s-x)(s-y)(s-z))½
where s = ½(x + y + z)
Trapezoid Area
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total area = ½(w1 + w2)h
Where h is the height and w1 and w2 are the top and bottom edge length
Circle Area
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total area = πr2
Where r is the radius
Sector Area
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total area = ½(θ/π)r2
Where r is the radius and θ is the angle
Ellipse Area
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total area = πab
Where a and b are the length of the major and minor axes
Parallelogram Area
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total area = bh
Where h is the height and b is the base length
Common Area Units
| Unit | Area in m2 |
| square meter | SI Unit |
| hectare | 10,000 |
| square kilometre (km2) | 1,000,000 |
| square foot | 0.0929 |
| square yard | 0.8361 |
| acre | 4,046.9 (43,560 square feet) |
| square mile | 2,589,988 (640 acres) |
