# Flooring Quantity Calculator

Planks and packs from room size and board format, with waste by laying pattern.

- Page: https://jianzhujisuan.com/en/flooring
- Category: Finishes (https://jianzhujisuan.com/en/c/finishes)
- Chinese version: https://jianzhujisuan.com/zh/flooring.md
- Data checked: 2026-10-25

## Quick result

With the default inputs (Room length 5 m, Room width 4 m, Board length 1200 mm, Board width 150 mm, Pieces per pack 8 pcs, Laying pattern Staggered): **Pieces needed 117 pcs**

## Inputs

| Parameter | Type | Default | Unit | Note |
|---|---|---|---|---|
| Room length | number | 5 | m |  |
| Room width | number | 4 | m |  |
| Board length | number | 1200 | mm |  |
| Board width | number | 150 | mm |  |
| Pieces per pack | number | 8 | pcs |  |
| Laying pattern | select | Staggered | — |  |

## Formula

- **Area**: A = length × width
- **Per piece**: a = board length × width ÷ 10⁶
- **Pieces**: n = ceil(A × (1 + waste) ÷ a)
- **Packs**: P = ceil(n ÷ pieces per pack)
- **Per m²**: 1 ÷ a

## Worked example

A 5 × 4 m room with 1200 × 150 mm boards, 8 per pack, staggered: 20 m² needs 117 pieces, so 15 packs (120 pieces) with 3 spare.

## Questions

### Why not just divide the area?

Boards are laid whole and cut at the edges, and offcuts are usually unusable. Room dimensions are rarely exact multiples of the board width, so the last row may be cut nearly in half. Hence the waste allowance: 5% staggered, 10% diagonal. The more complex the pattern, the more waste — physics, not upselling.

### Is waste the same as a spare pack?

No, keep both. Waste is material cut off and discarded, already inside the piece count; a spare pack is extra kept for future repairs. Shades vary noticeably between batches and matching a few years later is nearly impossible — one spare pack can save re-laying a whole room.

### Which way should boards run?

Along the longer dimension and toward the main light source: the room reads longer and joint shadows are less visible. Stagger at least a third of the board length — shorter offsets look stepped and concentrate stress. Over underfloor heating leave an 8-10 mm expansion gap, hidden by the skirting.

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- [Skirting Board Calculator](https://jianzhujisuan.com/en/skirting): Metres and lengths from perimeter and doorways, with waste.

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Generated by BuildCalc. All calculations run in your browser; no data is uploaded. Formulas follow national standards and common trade practice; local codes govern.