How do I calculate flooring square feet and boxes for multiple rooms?
Total floor area is summed across rooms, multiplied by the waste allowance, then divided by coverage per box and rounded up.
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Flooring calculator
Estimate flooring area, package count, and cutting waste across multiple rooms.
- Metric and imperial units
- Instant updates as inputs change
- Data is calculated in this browser only
Results are planning estimates. Confirm site dimensions, product specifications, and installation waste before purchasing.
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Calculation notes
Understand the Flooring calculator
Floor area is calculated for each selected room shape and summed. Cutting waste is added, then adjusted area is divided by coverage per box and rounded up.
How many boxes cover 220 sq ft with 10% waste?
Rooms of 12 × 10 ft and 10 × 10 ft total 220 sq ft. With 10% waste, cover 242 sq ft; at 20 sq ft per box, buy 13 boxes.
How much flooring waste should I add for the layout?
- Buy full boxes from one production lot when possible.
- Increase waste for diagonal layouts, stairs, or many small rooms.
Why should flooring be purchased in full boxes from one lot?
- Color can vary by lot, so buying the full quantity from one lot is preferable.
- Diagonal, herringbone, and complex layouts need a larger waste allowance.
- Closets, transitions, board direction, pattern matching, and unusable offcuts change the total.
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