Square Footage Calculator
Calculate square footage for a rectangle, triangle, circle, trapezoid or ellipse — enter dimensions in feet, inches, meters, centimeters or yards and get the area in square feet, square meters, square yards and square inches, with an optional cost estimate.
Input
The plan shape of the room, lot or surface.
Unit the dimensions below are entered in.
Leave blank to skip the cost estimate.
Output
| Metric | Value |
|---|---|
| No data yet | |
One-line overview of the area in square feet.
More ways to use this tool
REST API
curl -X POST https://api.iotools.cloud/v1/tool/square-footage-calculator \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"shape": "rectangle",
"unit": "feet",
"length": "20",
"width": "15"
}'Swap in your own key from your account. The tool's fields are the body — no wrapper.
Ask an AI agent
Use the IOTools `square-footage-calculator` tool (Square Footage Calculator) on this input:
YOUR_INPUT_HEREPaste this at any agent connected to the IOTools MCP server, then add your input.
Embed widget
<iframe
src="https://iotools.cloud/embed/square-footage-calculator/"
width="100%" height="520" frameborder="0" scrolling="no" loading="lazy"
title="Square Footage Calculator — iotools.cloud"
sandbox="allow-scripts allow-forms allow-same-origin allow-downloads allow-popups allow-popups-to-escape-sandbox"
allow="clipboard-write"
style="width:100%;border:1px solid #e5e7eb;border-radius:12px;overflow:hidden"></iframe>
<script src="https://iotools.cloud/embed.js" async></script>Drop this into your own page — free, no key required, just a link back.
| Cost per API/MCP call | From 5 credits |
|---|---|
| Need more credits? | View pricing |
Also available with
Guides
Calculate square footage for a room, lot or surface — rectangle, triangle, circle, trapezoid or ellipse — entered in feet, inches, meters, centimeters or yards. Get the area converted into square feet, square meters, square yards and square inches at once, with an optional price-per-square-foot cost estimate.
Supported shapes
- Rectangle — length x width.
- Triangle — base x height, halved.
- Circle — from the radius. Useful for round patios, pools and planters.
- Trapezoid — top side, bottom side and height. Useful for tapered lots and pitched-roof sections.
- Ellipse — semi-major and semi-minor axis. Useful for oval pools, rugs and planting beds.
How to use it
- Choose the shape that matches your space.
- Choose the unit your dimensions are in.
- Enter the dimensions.
- Optionally enter a price per square foot to get an estimated material or project cost.
All calculations run in your browser — nothing is uploaded.
How do I calculate square footage for an L-shaped or multi-section room?
Split it into rectangles (or other supported shapes), calculate each section separately, and add the results together. For a tile-purchase estimate on a rectangular or L-shaped room specifically — including grout gap and box rounding — use the Floor / Tile Area Calculator instead.
What's the difference between square feet and square yards?
One square yard equals 9 square feet (a 3ft x 3ft square). Carpet and turf are commonly priced per square yard, while flooring, tile and paint are commonly priced per square foot — this calculator gives you both so you can compare quotes in either unit.