Quick answer
For a rectangular room, multiply length by width. For L-shaped or irregular rooms, split the floor into rectangles, calculate each area separately and add the results.
Step by step
- Sketch the room. Mark closets, alcoves and unusual shapes.
- Measure each section. Use the same unit for every dimension.
- Calculate area. Multiply length × width for each rectangle.
- Add sections. Combine the measured areas before applying waste and box rounding.
Formula or rule of thumb
Example
A 12 × 10 ft room plus a 3 × 4 ft closet is 120 + 12 = 132 ft² before waste.
Common mistakes
Common errors include forgetting closets, measuring wall-to-wall in mixed units, and rounding each small section separately instead of totaling the measured area first.
Planning note: product yields, installation methods, site conditions and local requirements can change the final quantity. Use the exact manufacturer or supplier information before purchasing.
FAQ
Do I include closets?
Include closets when they will receive the same flooring.
Should I subtract cabinets?
Only subtract fixed areas that definitely will not receive flooring.
When do I add waste?
Add waste after calculating the total measured floor area and before box rounding.