Planning result
A 10x12 room is 120 square feet. With 10% waste and 20 sq ft per box, plan 132 adjusted square feet and 7 full boxes.
Assumptions
| Room size | 10 ft by 12 ft. |
|---|---|
| Waste | 10% for cuts and layout. |
| Box coverage | 20 sq ft per box. |
| Layout | Straight layout in a simple rectangular room. |
Calculation
| Step | Result | Formula |
|---|---|---|
| Floor area | 120 sq ft | 10 x 12 |
| Waste amount | 12 sq ft | 120 x 0.10 |
| Adjusted area | 132 sq ft | 120 + 12 |
| Boxes | 6.6 boxes | 132 / 20 |
| Practical buy | 7 boxes | Round up to full boxes |
Why full boxes matter
Flooring is sold by the box. The final decimal result must be rounded up, not down, because partial boxes are not normally sold.
When to increase waste
Use more than 10% for diagonal layout, closets, angled walls, stairs, damaged boards, or a layout that creates many short offcuts.
Next step
Use the linked calculator or planning hub to adjust dimensions, waste, coverage, depth, spacing, or product packaging for the real project.
Related guides
FAQ
How many boxes for a 10x12 room?
With 20 sq ft boxes and 10% waste, buy 7 boxes.
Does this include closets?
No. Add closet area before waste if the same flooring continues into closets.
Should I keep extra flooring?
Yes. Spare boards help with future repairs and color matching.