Calculate area, perimeter, volume, and surface area for 17 shapes — from circles and triangles to cylinders and
spheres. Every result shows the formula used.
Try:
Step 1 — choose dimension
Step 2 — choose shape
Step 3 — enter measurements
Optional — show only specific results
Optional — measure a specific face
Results
How to use
Choose 2D (area, perimeter) or 3D (volume, surface area).
Click a shape from the grid — a diagram and input fields appear.
Select a length unit (mm, cm, m, ft, etc.) to label your results.
Enter the measurements and click Calculate →.
Optionally filter results using the metric chips, or select a face on 3D shapes for face-level measurements.
Frequently Asked Questions
How do I calculate the area of a circle?
Area
= π × r². For example, a circle with radius 5 m has area = π × 25 ≈ 78.54 m².
What is the formula for the volume of a cylinder?
Volume = π × r² × h, where r is the base radius and h is the height.
What is the difference between perimeter and
area?
Perimeter is the total boundary length of a 2D shape (measured in units). Area is the 2D space enclosed by the
shape (measured in square units).
How do I find the surface area of a sphere?
Surface area = 4 × π × r². A sphere with radius 3 m has surface area ≈ 113.1 m².
What units does this calculator support?
All
common metric units (mm, cm, dm, m, dam, hm, km) and imperial units (in, ft, yd, fur, mi, lea). Select your unit
from the dropdown and results are labelled accordingly.
Did you know?
A sphere has the largest volume for any given surface area — this is why soap bubbles are spherical.
The Great Pyramid of Giza has a square base of about 230 m per side and a volume of approximately 2.6 million
cubic metres.
Heron of Alexandria (c. 60 AD) derived the formula for triangle area from side lengths alone — now called
Heron's formula.