Laminate Flooring Calculator

Cartons = floor area plus extra ÷ the coverage on the carton, rounded up: a 12 × 10 ft room is 120 sq ft, or 7 cartons of 20 sq ft with 10% extra, laid as 70 planks in 20 rows.

Your measurements

Example

Use the unit shown for each box, or type another one: 12 ft 6 in, 150 in, 3.8 m and 600 mm all work, as do the marks on a tape measure.

Room 1

Room length (ft) Room width (ft) Area left uncovered (sq ft) Surface shape An L-shaped room is a rectangle with one corner missing. Measure the overall length and width, then the missing corner.

Extra for cuts (%) Extra is added to both the area order and the separate cut-layout allowance. Check both figures and the carton coverage. The layout counts a new plank for each cut position; it does not reuse offcuts.

Details Package sizes, prices and materials

Planks run along Plank length Plank face width Perimeter gap from product instructions Offset of alternating rows Carton coverage (sq ft) Your price per carton ($) Underlayment roll coverage (sq ft)

Example: replace these measurements

Your material list

7 cartons by area

120 sq ft measured

Your measured layout

First room, rotated so planks run across the drawing. Rows show the entered widths and alternate start offset. Large layouts draw the first 1,800 positions. Cuts consume one plank each; no offcut reuse is assumed.

Your shopping list

7 cartons by area

Already have some? See what it covers

How many cartons you have

Quantities and package details

Net room area: 120 sq ft
Area with allowance: 132 sq ft
Unassigned purchased coverage: 20 sq ft
Cut-layout carton allowance: 8 cartons; no offcut reuse
Whole plank positions: 50
Cut plank positions: 20
Offcut area before reuse: 20 sq ft
Room 1: 120 sq ft · 20 rows · 70 plank positions
Underlayment rolls: Enter coverage if required
Carton subtotal for area allowance: Enter your unit price

Area cartons and the conservative cut allowance answer different questions. L-shaped corners are removed from the cutting layout. Other exclusions affect area only; split rooms around obstacles for a cutting layout.

The calculation

120 × (1 + 10/100) ÷ 20, rounded up = 7
Cut allowance: 70 plank positions with 20 sq ft offcut; no reuse assumed.

Common questions

How much laminate flooring do I need?

Enter each room, the plank size and the carton coverage. You get two answers: cartons by area with your extra, and a cut layout that counts every cut plank as a whole one. Order the larger.

Do I subtract the expansion gap?

Leave the gap the laminate maker gives at every wall. The calculator takes it off the layout, not off the order.

Do I need underlayment under laminate?

Only if the product calls for it. Some laminate has a pad attached. Enter the underlayment roll coverage only when a separate layer is needed.

How to plan the quantity

The perimeter gap reduces the plank-layout dimensions, while the purchase allowance uses net room area. Keep both numbers visible rather than treating the gap as a way to reduce the order.

Rows alternate between a full-plank start and your chosen offset. The cutting allowance counts a new plank for every cut position; offcuts are listed but not silently reused.

Underlayment is a separate product decision. Leave its coverage blank until you know whether a separate layer belongs in this installation.

For an L-shaped floor, enter the widest length and width, then the size of the missing top-right corner. The plank layout removes that corner in either plank direction and allows the perimeter gap at its inner edges. Other excluded areas affect the area order only.

Before you order

This layout does not approve expansion gaps, minimum end joints or an underlayment system. Check the selected product instructions.
Split closets and L-shaped rooms into rectangles. Door undercuts, stairs and transitions remain separate measurements.

Before ordering, read the guide: How much flooring do I need? Square feet, boxes and waste. Or choose another calculator.