How to use the Area Calculator

Quick start

1. Choose rectangle, triangle, circle, trapezoid, or parallelogram.
2. Enter the measurements requested for that shape.
3. Add a unit label if useful.
4. Press Calculate area and review the formula steps.

Choosing the right shape mode

Use rectangle mode for length times width, triangle mode for base and height, circle mode for radius, trapezoid mode for two bases and height, and parallelogram mode for base and height.

Each shape mode keeps the fields focused so you do not have to ignore irrelevant inputs.

Square units

Area is reported in square units because it measures a flat surface. If the measurements are in meters, the area is in m^2.

Make sure every measurement uses the same unit before calculating.

When to use another tool

Use the Circle Calculator if you want radius, diameter, circumference, and area together.

Use the Volume Calculator or Surface Area Calculator for three-dimensional solid shapes.

Examples from the calculator

History, privacy, and copying

Recent answers stay visible in the page while you work. The history is kept only in the current browser tab and is not sent to a server.

Copy answer copies the expression and result so you can paste it into notes, homework, a message, or another document.