OTHER · FLOORING
Flooring Calculator
Calculate square footage of flooring needed with waste factor, number of boxes from coverage per box, and total cost estimate for any room.
About This Calculator
Enter the room dimensions and waste factor, then optionally add box coverage and price to get exact box count and total cost — always rounded up so you have enough material.
How It Works
Room area (sq ft) = length × width. Total to buy = area × (1 + waste%). A 10% waste factor is standard for straight-lay installations; use 15% for diagonal or herringbone patterns where more cuts are needed. Box count = ⌈sqFtToBuy ÷ coveragePerBox⌉. Total cost = boxes × cost per box.
The Formula
sqFtToBuy = lengthFt × widthFt × (1 + waste÷100) boxes = ⌈sqFtToBuy ÷ coveragePerBox⌉
- waste
- waste percentage (10% standard, 15% diagonal)
- coveragePerBox
- sq ft covered per flooring box (from box label)
Frequently Asked Questions
- How much waste factor should I add?
- Use 10% for standard straight-lay installations. Use 15% for diagonal patterns or herringbone layouts because the angled cuts produce more offcuts. Add an extra 5% (15–20% total) for irregularly shaped rooms with many cuts around obstacles.
- How do I find the coverage per box?
- The coverage is printed on the flooring box label, usually expressed as "X sq ft per box" or sometimes "X sq ft per carton." It accounts for the plank dimensions and tongue-and-groove overlap. Enter that number directly — do not calculate it yourself from plank size.
- Should I measure room area or the actual floor I'll cover?
- Measure the actual floor area you plan to cover, including under fixed furniture if it will stay in place. For L-shaped rooms, split them into rectangles, calculate each separately, and add the totals.
- What if I have leftover boxes?
- Many retailers accept returns of unopened, undamaged boxes within 30–90 days. Keep your receipt and purchase extras from the same dye lot — flooring colour varies between production runs.
Estimates only. Coverage figures (sq ft/gallon, bag yield, BTU/sq ft) are industry rules of thumb with real-world variance. Verify quantities with your supplier before purchasing.