Flooring Calculator
Estimate flooring boxes from room size and the coverage printed on the carton.
Written by Golam Rabbani, Founder & Lead Engineer
How to use this flooring calculator
- Toggle imperial (ft / ft²) or metric (m / m²) for your dimensions.
- Enter the room length and width.
- Enter the coverage area printed on each flooring carton — this is usually 18–25 ft² or 1.7–2.3 m².
- Set the waste / overage percentage (10% default; 15% for diagonal or herringbone).
- Press Calculate to see the number of boxes you need to buy.
About this flooring calculator
The flooring calculator estimates how many boxes of laminate, vinyl plank, engineered hardwood, or solid hardwood flooring you need to cover a rectangular room. It computes the room area, adds the waste percentage you specify, then divides by the coverage value printed on the carton to give a whole-box count.
Worked example: a 15 ft × 12 ft living room is 180 ft². Adding 10% waste for offcuts gives 198 ft² to buy. If each box of vinyl plank covers 20.06 ft² (a common size), 198 / 20.06 = 9.87 boxes. The calculator rounds up to 10 boxes. That leaves around 2.5 ft² of spare planks at the end of the job — useful for repairs later.
Always buy from the same dye-lot/batch number where possible. Manufacturers print the coverage and lot number on every carton; if you run out mid-job, a fresh batch may have visible color differences. Plan to keep at least one extra box of every flooring product on the project even after install, because plank patterns and finishes are commonly discontinued within a couple of years.
FAQ
- How much flooring waste should I add?
- Use 10% for a straight-lay floor in a rectangular room. Bump to 15% for diagonal layouts, herringbone, or rooms with multiple closets and angles. Cheap laminate can take 5% if you are confident and careful.
- Where do I find the box coverage value?
- Look on the side or top of the carton — it is printed as "Coverage: 20.06 sq ft" or similar. It is the total area the planks in that box will cover when installed without waste.
- Why is one extra box recommended?
- Production runs change, batches go out of stock, and patterns get discontinued. Keeping one sealed extra box guarantees you have exact matching planks for repairs years later.
- Does this work for tile, vinyl plank, and hardwood?
- Yes. As long as the product is sold in cartons with a coverage area, the math is identical. For tile, prefer the dedicated Tile Calculator since it accounts for grout gaps.
- What about transitions and underlayment?
- The calculator covers planks only. Add transition strips, T-mouldings, and underlayment to your order separately, sized to your door openings and room perimeter.
- Is this calculator free?
- Yes — free, no signup, no upload. The math runs locally in your browser.