How do I measure an irregular room?

Divide it into rectangles, measure each one and add them as separate rooms. Small alcoves and closets can be added the same way.

Where do I find the coverage per box?

It's printed on the packaging or the product page, usually in square feet or square metres per box (for example 20.5 sq ft). Enter it in the same unit you're measuring in.

Does this work for carpet?

For the area, yes. Carpet is often sold by roll width, so the amount you buy also depends on seam placement — ask your supplier to confirm.

Flooring Calculator

Work out how much laminate, vinyl, hardwood or carpet to buy. Add each room, enter the coverage printed on the box, and get the total area, boxes needed and an optional cost estimate.

Room 1
Length (ft)
Width (ft)

Coverage per box (sq ft)

Printed on the box. Leave blank to skip.

Waste allowance (%)

Typically 5–10%; 15% for diagonal or herringbone.

Price per sq ft (optional)

Measure each room at its longest and widest points and add closets and doorways you plan to floor. For L-shaped rooms, split them into rectangles and add each as its own room.

120 sq ft

Floor area

132 sq ft

Flooring incl. 10% waste

Boxes

Add a price

Estimated cost

Everything you enter is processed in your browser and isn't sent to our servers.

How to use flooring calculator

1Choose US (feet) or metric units.
2Enter each room's length and width — use “Add another room” for more.
3Enter the coverage per box and a waste allowance.
4Optionally add the price per square foot or square metre for a cost estimate.

About this tool

The calculator adds up the area of every room, applies your waste allowance and divides by the coverage per box, rounding up — you can't buy part of a box. Waste allows for cutting boards to length, working around doorframes and matching patterns: 5–10% is common for a straight lay, and 15% or more for diagonal or herringbone patterns.

Example: a 12 × 10 ft room plus an 8 × 10 ft room is 200 sq ft. With 10% waste you need 220 sq ft, which is 11 boxes at 20 sq ft per box.

Measure at the longest and widest points, and include closets and any areas under appliances you plan to floor. For odd-shaped rooms, split them into rectangles and add each one. The result is an estimate — underlay, trims and transition strips are bought separately.

Frequently asked questions

Typically 5–10% for a straight installation in a simple room, and 15% or more for diagonal or herringbone layouts or rooms with lots of corners.

Related tools

Tile Calculator

Work out how many tiles you need for a floor or wall, including waste.

Square Footage Calculator

Work out the area of rooms and spaces in square feet and square metres.

Paint Calculator

Estimate how much paint you need for a room's walls and ceiling.

Board Foot Calculator

Calculate board feet for lumber from thickness, width and length.