Square Footage Calculator
Updated Formulas shown
Square footage = length × width for rectangles. A 12 × 15 ft room is 180 ft² (20 yd², 16.7 m²). For irregular spaces, split them into simple shapes and add the results.
Total area
180 ft²
- Square yards
- 20 yd²
- Square meters
- 16.72 m²
- Acres
- 0.0041
Quick reference
| Room | ft² | yd² | m² |
|---|---|---|---|
| 10 × 10 ft | 100 | 11.1 | 9.3 |
| 10 × 12 ft | 120 | 13.3 | 11.1 |
| 12 × 12 ft | 144 | 16 | 13.4 |
| 12 × 14 ft | 168 | 18.7 | 15.6 |
| 12 × 16 ft | 192 | 21.3 | 17.8 |
| 14 × 16 ft | 224 | 24.9 | 20.8 |
| 16 × 20 ft | 320 | 35.6 | 29.7 |
| 20 × 20 ft | 400 | 44.4 | 37.2 |
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Frequently asked questions
How do I calculate square footage of a house?
Measure each room's length × width, add the rooms, and include hallways and closets. Appraisers use exterior measurements of finished, heated space.
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Estimates only. Check quantities with your supplier or contractor before ordering.