Square Footage Tool
Calculate combined floor or surface areas across eight shapes, including L-shaped spaces. Review each section’s contribution, add a material allowance, estimate pack quantities and costs, and compare results through a visual breakdown and downloadable summaries.
| Area | Shape | Area | Share |
|---|---|---|---|
| Total | 100% | ||
Table of Contents
Highlights
- Eight geometric shapes, including L-shaped spaces
- Combine and label multiple project areas
- Instant area-share chart and detailed breakdown
- Waste allowance, whole-pack quantities and cost estimates
- Export project results as CSV, JSON or text
How Square Footage Tool Works?
Each named area uses its selected shape and positive dimensions to produce a surface area. The results are added to obtain total project area. A proportional chart shows each area's percentage of that total.
| Shape | Area formula |
|---|---|
| Rectangle | Length × width |
| Square | Side² |
| Triangle | Base × perpendicular height ÷ 2 |
| Circle | π × radius² |
| Ellipse | π × semi-major axis × semi-minor axis |
| Trapezoid | (Parallel side A + parallel side B) × perpendicular height ÷ 2 |
| Parallelogram | Base × perpendicular height |
| L shape | Overall length × overall width − cut-out length × cut-out width |
For example, a 15 ft by 12 ft room has:
Extra material is applied to the aggregate area, then pack count is rounded upwards to a whole pack:
Estimated material cost is required area multiplied by the entered price per square foot. Where the shape provides enough dimensions, perimeter is also shown: rectangles, squares, circles, ellipses, parallelograms and L shapes. The ellipse uses Ramanujan's approximation; for triangles and trapezoids, the given dimensions do not determine every edge.
Practical Use Cases
Homeowners: Add living rooms, kitchens and irregular spaces to estimate flooring coverage and an allowance for offcuts before ordering materials.
Flooring installers: Separate rooms into named sections, compare their percentage shares and estimate complete packs required for a job.
Landscapers: Work out rectangular lawns, circular patios and L-shaped paved areas, including additional material for fitting and wastage.
Builders and renovators: Combine wall or surface sections of different geometric shapes and use the area breakdown to prepare preliminary quantities.
Estimators and project managers: Enter an indicative unit rate, review the resulting materials estimate and export a CSV, JSON or text summary for project notes.
Accuracy and Limitations
Results are mathematically accurate for the selected idealised shapes and entered dimensions, subject to numerical rounding and the chosen display precision. Measurements must reflect actual geometry: curved boundaries, recesses and uneven surfaces can require additional sections. Triangle and trapezoid perimeters are unavailable because their inputs do not define all sides; the ellipse perimeter is approximate. The L-shape calculation assumes one rectangular corner cut-out. The pack estimate assumes the entered coverage applies uniformly, and the cost estimate uses required area times the entered price per square foot, excluding labour, taxes, delivery and pack-specific pricing.
