Flooring Calculator

What formula does this flooring calculator use?

Floor area = main length × main width, plus the L-section area when both its fields are above zero. The order quantity is that area × (1 + waste%). A 5 × 4 m room at the default 10% waste gives 20.00 m² and 22.00 m² to buy, which is 236.81 ft² (the tool multiplies by 10.7639).

How is the number of packs worked out?

The waste-adjusted area is divided by the pack coverage and rounded up. At 2.4 m² per pack, 22.00 m² is 9.17 packs, shown as 10. Enter 0 for pack coverage if you do not know it, and the packs line disappears.

What does the plank or tile size do?

The width and length (in centimetres) are used for the approximate piece count only. The tool divides the waste-adjusted area by one piece’s area and rounds up, so a 20 × 120 cm plank gives 92 pieces for 22.00 m². Packs often contain whole planks, so the pack figure is the one to order from.

How do I enter an L-shaped room?

Put the main rectangle in the first two fields and the extra rectangle in the L-section fields; the two areas are added together. If either L-section value is zero, the whole section is ignored without a warning, so check the floor area line. A 4 × 3 m room plus a 2 × 1.5 m section shows 15.00 m². For more than two rectangles, add the extra areas yourself.

Does it subtract cupboards, stairs or doorways?

No. It multiplies the dimensions you give and does not subtract anything. If a kitchen island or built-in unit will sit on top of the floor, either enter smaller dimensions or leave it in as a cushion for cuts and mistakes.

What waste percentage should I enter?

That is a judgement the tool leaves to you. The value is applied once to the whole area and does not change with the plank layout. Rooms with many cuts, angled laying or patterned boards need a larger percentage than a simple straight lay, and the manufacturer’s laying guide may give its own figure.

Does it work for carpet, tile or vinyl?

It works for anything priced by area. Rolled carpet and vinyl are cut from a fixed width, which can waste more than a percentage suggests, so check roll widths with your supplier. The tile calculator on this site is the better fit when you need a count that includes grout joints.

Does it check the subfloor, underlay or expansion gaps?

No. It is only an area and quantity estimate. Subfloor condition, underlay, moisture, expansion gaps and manufacturer installation requirements are outside what it knows, so follow the guidance supplied with your product.