Free estimate — verify against local code before building
Flooring Calculator
Boxes or carpet roll layout, waste, underlayment, trim, supplies, and cost.
What this calculator includes
Measure one rectangular room, choose LVP, laminate, nail-down hardwood, or broadloom carpet, and enter the coverage printed on the product. The estimate rounds boxed flooring to full cartons; for carpet, it compares both roll directions and shows strips, seams, and linear yards. Underlayment, transitions, baseboard, installation supplies, and editable material costs stay visible so you can audit the order before shopping. Manufacturer instructions and an installer-approved layout control the final purchase.
How to use this flooring calculator
- 01
Measure each room
Measure the longest finished length and width in feet. Split L-shaped or connected spaces into rectangles and run each area separately; carpet seams and continuous plank layouts need a whole-project plan.
- 02
Copy the package coverage
For LVP, laminate, or hardwood, enter the exact square feet printed on one carton. For carpet, enter the full roll width, usually 12 or 15 feet. The calculator rounds to units you can actually buy.
- 03
Choose a waste allowance
A simple rectangular floating floor often starts near 10%. Add more for diagonal layouts, pattern matching, damaged boards, many doorways, or irregular rooms. Carpet roll layout creates additional offcuts that are shown separately.
- 04
Verify the system
Check approved underlayment, moisture limits, expansion gaps, fasteners, transitions, acclimation, and installation direction in the selected flooring warranty before placing the order.
Calculation sources and review
Primary references and formula assumptions are linked so you can verify them against the selected product, supplier, and adopted local requirements.
Internal formula review completed July 13, 2026. What this review covers
- Carpet and Rug Institute — installation standards (opens in a new tab)
Carpet seam, cushion, and installation-system guidance.
- National Wood Flooring Association — technical guidelines (opens in a new tab)
Wood-floor installation and subfloor guidance.
- U.S. EPA — protecting against asbestos exposure (opens in a new tab)
Safety guidance for suspect existing flooring and adhesive.
Frequently asked questions
How many boxes of flooring do I need?
Multiply room length by width, add the selected waste percentage, divide by the square-foot coverage on one box, and round up. A 12 by 10 foot room with 10% waste needs 132 square feet; at 23.64 square feet per box, that is 6 boxes and 141.84 square feet purchased.
How much extra flooring should I buy?
Ten percent is a practical planning allowance for many simple plank layouts. Use more for diagonal work, patterned products, complex room shapes, numerous cuts, or when the manufacturer requires it. Keep unopened cartons returnable and save matching material for future repairs.
How does the carpet roll calculation work?
The calculator tests strips running in both room directions using the entered roll width, selects the layout that purchases less roll area, applies the waste allowance, and rounds up to the next half linear foot. Pattern repeat, pile direction, stairs, and seam placement can change an installer's final layout.
Do I need underlayment under new flooring?
It depends on the product and subfloor. Many floating planks have attached pad, while laminate and some LVP systems require a separate approved underlayment or vapor control layer. Stretch-in broadloom carpet normally uses cushion. Follow the flooring and adhesive warranty, especially over concrete or radiant heat.
Does this flooring cost include labor?
No. The total is an editable materials estimate for purchased flooring, underlayment, transitions, trim, and a supplies allowance. Demolition, subfloor repair, moisture mitigation, delivery, tax, tool rental, installation labor, and disposal are not included unless you add them to the supplies allowance.