Ellipse Boundary Length calculator.
Estimate an oval boundary length rather than only its area.
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.
Uses the two full measured axes. The approximate curved length is useful for comparing quantity estimates, not a surveyed boundary or a cutting accuracy guarantee.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Full major axis
- 2 m
- Full minor axis
- 2 m
Approximate ellipse perimeter: 6.28 m
Uses Ramanujan’s second perimeter approximation. The value is approximate, especially for very elongated ellipses.
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.
Uses the two full measured axes. The approximate curved length is useful for comparing quantity estimates, not a surveyed boundary or a cutting accuracy guarantee.
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.