Home improvement
Flooring Calculator
Works flooring quantity, where the waste allowance depends on the layout.
Result
Always buy one box more than the calculation and keep it. Dye lots change between production runs, so a repair years later rarely matches if you did not keep spares.
Get a Free Business AuditHow the calculation works
Floor area divided by the coverage per box or roll, rounded up to whole packs, with a waste allowance. The allowance depends on the room's shape and the installation pattern far more than on the material: a simple rectangle wastes little while a cut-up space or a diagonal layout wastes a great deal.
What moves the number
- Room shape and how many cuts it forces.
- Installation pattern, particularly diagonal or herringbone.
- Plank or tile size against the room dimensions.
- Pack sizes, which force rounding up.
Where this one goes wrong
A diagonal or herringbone layout wastes substantially more than a straight one, because every board at the perimeter is cut at an angle and the offcuts cannot be reused, which means the pattern has to be decided before the quantity is ordered. Decide the layout first. Ordering slightly extra from the same batch is also worth doing, since a later repair from a different production run rarely matches and the dye lot is not reproducible.
Before you quote
- Decide the installation pattern before ordering.
- Raise the waste allowance for cut-up rooms and diagonal layouts.
- Order extra from the same batch for future repairs.
Questions
About this calculator
How much waste should I allow?
It depends on the room shape and the pattern more than the material. A simple rectangle laid straight wastes little; a cut-up space or a diagonal or herringbone layout wastes substantially more because the angled offcuts cannot be reused.
Should I order extra for repairs?
Yes, from the same batch. A later repair from a different production run rarely matches, since dye lots and production batches vary and are not reproducible. A spare box in the garage is cheap insurance against a visible patch.
Why round up to whole packs?
Because flooring is sold by the pack and you cannot buy part of one. On a small room that rounding is a meaningful share of the order, which is why the pack coverage rather than the area is what determines the cost.
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How to use this calculator
- Room length (ft) (ft). Enter your own figure; the page starts at 18 ft.
- Room width (ft) (ft). Enter your own figure; the page starts at 14 ft.
- Coverage per box (sq ft) (sq ft). Enter your own figure; the page starts at 24 sq ft.
- Waste allowance (%). 10% for straight lays, 15–20% for diagonal or herringbone.
- Cost per box ($). Enter your own figure; the page starts at $62.
The result updates as you type, so you can try a figure, see what it does to boxes needed, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Room length (ft) | 18 ft |
| Room width (ft) | 14 ft |
| Coverage per box (sq ft) | 24 sq ft |
| Waste allowance | 10% |
| Cost per box | $62 |
What comes out
| Result | Value |
|---|---|
| Boxes needed main result | 12 |
| Area | 252.0 |
| Area including waste | 277.2 |
| Estimated material cost | $744 |
| Underlay needed (sq ft) | 264.6 |
For 252.0 sq ft plus 10% waste you need 12 boxes, costing about $744.
How sensitive the answer is
Holding everything else steady and changing only cost per box, this is what happens to boxes needed. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Cost per box ($) | Boxes needed |
|---|---|
| $31 | 12 |
| $46.5 | 12 |
| $62 example above | 12 |
| $93 | 12 |
| $124 | 12 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Room length (ft) (ft)
- Measured in ft, starting at 18 ft.
- Room width (ft) (ft)
- Measured in ft, starting at 14 ft.
- Coverage per box (sq ft) (sq ft)
- Measured in sq ft, starting at 24 sq ft.
- Waste allowance (%)
- 10% for straight lays, 15–20% for diagonal or herringbone.
- Cost per box ($)
- A money amount, starting at $62.
What the results tell you
| Result | What it is |
|---|---|
| Boxes needed | The headline result. A number. |
| Area | A decimal figure. |
| Area including waste | A decimal figure. |
| Estimated material cost | A money figure. |
| Underlay needed (sq ft) | A decimal figure. |
Keep going
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