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Instant result
The result updates directly based on the values you enter.
Online Calculator
Area and perimeter calculator
Select a shape and enter its dimensions to calculate its area and perimeter.
Area
50
Perimeter
30
Information
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Local processing
The calculations are done in your browser without sending the data to a server.
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Free
No registration, subscription, or paid API required.
Frequently asked questions
What figures does it include?
Rectangle, square, circle and triangle.
How does it calculate the area of a triangle?
Uses Heron’s formula with the lengths of all three sides.
Does it check if the triangle is valid?
Yes. It checks whether the three lengths can form a triangle.
Are the units fixed?
No. You can use centimeters, meters, or another unit, as long as all measurements use the same unit.