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Square Footage Calculator Guide
Calculate the total square footage of one or more rooms or areas, and estimate material cost like flooring, carpet, or tile. Add a row for each space and the areas are added together.
Square feet = length (ft) × width (ft). For several rooms, add each room's area together for the total.
How Do I Calculate Square Footage?
Measure each room's length and width in feet and multiply them. For example, a 12 ft by 10 ft room is 120 square feet. For an L-shaped space, split it into rectangles, calculate each, and add them.
Estimating Material Cost
Once you have the total square footage, multiply by the price per square foot to estimate cost. It is common to add 5–10% extra for waste, cuts, and mistakes when ordering flooring or tile.
| Room | Size | Sq Ft |
|---|---|---|
| Small bedroom | 10 × 10 | 100 |
| Living room | 15 × 20 | 300 |
| Two-car garage | 20 × 20 | 400 |
Related: Area Calculator, Area Converter, and Gravel Calculator.
Frequently Asked Questions
How do I calculate square footage?
Multiply the length by the width in feet for each area, then add the areas together for the total.
How do I find square footage of an odd-shaped room?
Break the space into rectangles, calculate each one separately, and add them up — this calculator lets you add a row for each.
How much extra flooring should I buy?
Adding about 5–10% over the measured square footage covers waste, cuts, and future repairs.
How do I convert square feet to square meters?
Multiply square feet by 0.092903, which this calculator also shows automatically.
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