Rounded Rectangle Area calculator.
Measure a rectangular outline with four equal rounded corners.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
Subtracts four corner squares and adds four quarter-circles. Zero radius returns an ordinary rectangle; semicircular-ended capsules remain a separate shape.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Overall length
- 4 m
- Overall width
- 3 m
- Four corner radii
- 1 m
Rounded rectangle area: 11.14 m²
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
Subtracts four corner squares and adds four quarter-circles. Zero radius returns an ordinary rectangle; semicircular-ended capsules remain a separate shape.
Dimensions, quantities, prices, timing and product properties are supplied by you. This tool does not select construction specifications or assess structural, electrical or hydraulic suitability.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.