Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Geometry
Rectangle Calculator
Find any rectangle measurement — area, perimeter, or diagonal — from any two known values such as length and width, area and a side, or perimeter and a side. Ideal for home improvement, flooring, and geometry homework.
Fill in the required fields to see your result.
Geometry
Circle Area Calculator
Calculates the area enclosed by a circle from its radius using A = π·r². Ideal for geometry homework, landscaping projects, or sizing circular spaces like pools, garden beds, or pipe cross-sections.
Fill in the required fields to see your result.
Key differences
| Rectangle Calculator | Circle Area Calculator | |
|---|---|---|
| Category | Geometry | Geometry |
| Inputs required | 4 | 1 |
| Result | Result (units) | Circle Area (square units) |
| What it does | Find any rectangle measurement — area, perimeter, or diagonal — from any two known values such as length and width, area and a side, or perimeter and a side. Ideal for home improvement, flooring, and geometry homework. | Calculates the area enclosed by a circle from its radius using A = π·r². Ideal for geometry homework, landscaping projects, or sizing circular spaces like pools, garden beds, or pipe cross-sections. |