Construction

Flooring Calculator

Estimate the boxes of flooring needed for a room, with waste.

Room length

Room width

Coverage per box

Waste (%)

Price per box ($)

Calculated Output

Floor area 180

Boxes needed (boxes) 10

Total cost ($) 0

Formula: boxes = area × (1 + waste) ÷ coverage per box

Step-by-Step Breakdown

1. Values used:

2. Room length = 15

3. Room width = 12

4. Coverage per box = 20

5. Waste = 10 %

6. Price per box = 0 $

8. Floor area = Room length x Room width = 15 x 12 = 180

9. Boxes needed = 10boxes

10. Total cost = 0$

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The math behind it

Floor area = length × width. Add waste (usually 10%) for cuts and mistakes.

Boxes = area with waste ÷ coverage per box, rounded up.

15×12 ft room (180 ft²), 20 ft²/box, 10% waste → 180 × 1.10 ÷ 20 = 10 boxes.

How much waste for flooring?

10% for straight lays; 15% for diagonal or herringbone patterns.