How to Calculate Flooring
Multiply your room's length by its width to get square footage. Always add a waste factor before ordering. This free tool calculates square footage, waste-adjusted totals, and box counts — enter your room dimensions and price per box to get started:
| Installation Pattern | Waste Factor |
|---|---|
| Straight / parallel to walls | 7–10% |
| Diagonal (45°) | 12–15% |
| Herringbone pattern | 15–20% |
| Irregular room shape | +5% extra |
Flooring Material Cost Guide
| Material | Material Cost / ft² | Install Cost / ft² |
|---|---|---|
| Hardwood | $3–$12 | $3–$8 |
| Laminate | $1–$5 | $2–$4 |
| Vinyl Plank (LVP) | $2–$7 | $1–$3 |
| Ceramic Tile | $1–$10 | $4–$10 |
| Carpet | $2–$7 | $1–$3 |
Frequently Asked Questions
How much flooring do I need for a 12×12 room?+
A 12×12 room has 144 sq ft of floor area. Add 10% waste for a straight installation, so order approximately 158–160 sq ft. For diagonal or herringbone patterns, add 15–20% instead.
How do I calculate flooring for multiple rooms?+
Calculate each room separately (length × width), then add all areas together. Add your waste percentage to the total, not to each room individually, to minimize over-ordering.
What is the typical waste factor for flooring?+
For straight installations parallel to walls, use 7–10%. For diagonal (45°) installations, use 12–15%. For herringbone or complex patterns, use 15–20%. Irregular room shapes add another 5%.
How many boxes of flooring do I need?+
Divide your total square footage (including waste) by the coverage per box shown on the product packaging. Most laminate and vinyl plank boxes cover 20–25 sq ft; hardwood typically 15–20 sq ft.