Flooring Calculator

Enter the room size, the coverage per box from the label, and a waste allowance (5–10% is typical for plank flooring).

Room length

Room width

Waste

Sq ft per box

sq ft

Your price per sq ft (optional)

Result–

Flooring for common rooms

Room	Area	Buy (10% waste)	Boxes at 20 sq ft
10 × 10 ft	100 sq ft	110 sq ft	6
10 × 12 ft	120 sq ft	132 sq ft	7
12 × 12 ft	144 sq ft	158 sq ft	8
12 × 14 ft	168 sq ft	185 sq ft	10
12 × 16 ft	192 sq ft	211 sq ft	11
14 × 16 ft	224 sq ft	246 sq ft	13
15 × 20 ft	300 sq ft	330 sq ft	17
16 × 20 ft	320 sq ft	352 sq ft	18
20 × 20 ft	400 sq ft	440 sq ft	23

Flooring to buy = length × width × (1 + waste)

Laying planks diagonally or in a herringbone pattern can need 15–20% extra.

How much extra flooring should I buy?

5–10% for straight plank layouts; 15% or more for diagonal or patterned layouts.

Can I return unopened boxes?

Many stores accept unopened boxes, but keeping one spare box for repairs is common practice.