Square Footage Calculator — Flooring Cost Calculator
The materials-budget view: enter the room's dimensions, the price per square foot you were actually quoted, and a waste factor, and it returns the square footage to buy and what the material costs. A 120 square foot room at $4.50 per square foot with the standard 10% waste factor means buying 132 square feet for $594 — and stepping the waste up to 15% for a diagonal or herringbone install raises the order to 138 square feet and $621.
Square footage
Material cost
$594.00
buy 132 sq ft incl. 10% waste
Breakdown
Area is plain arithmetic on the dimensions you enter; flooring and paint use the waste and coverage assumptions shown above. A planning estimate — not a quote, bid, or appraisal.
The price per square foot is yours to supply
Flooring prices span an order of magnitude — sheet vinyl, laminate, engineered wood, solid hardwood, and tile all live in different bands, and the same product varies by region and retailer — so this page does no price lookup. Use the per-square-foot price from your actual quote or shelf tag, and the result is your real material budget rather than a national average that matches nobody's checkout total.
Remember what the number excludes: underlayment, transition strips, baseboards or quarter-round, delivery, old-floor removal, and installation labor are all quoted separately. Material is typically the smaller half of a professionally installed flooring job, so treat this estimate as the supply line of the budget, not the whole project.
Set the waste factor by installation pattern
The 10% default fits a straight lay in a reasonably regular room. Go higher when the pattern fights the room: diagonal installs and herringbone produce angled offcuts at every wall that rarely reuse, so 15% is the common floor for those, and intricate patterns or rooms with many doorways, closets, and jogs can justify more. On a 120 square foot room at $4.50 per square foot, moving from 10% to 15% waste raises the order from 132 to 138 square feet and the cost from $594 to $621 — a $27 difference it is better to know before the store run.
Buying the waste up front matters because flooring is made in dye lots: a box bought months later may not match. Leftovers double as the repair stock for the life of the floor.
Questions
- How much flooring should I buy for a 120 square foot room?
- About 132 square feet with the standard 10% waste factor for a straight lay — at $4.50 per square foot, that is $594 of material. Use 15% or more for diagonal or herringbone patterns.
- What waste percentage should I use for herringbone or diagonal installs?
- 15% is the common starting point, versus 10% for a straight lay. Angled cuts at every wall create offcuts that cannot be reused elsewhere in the field.
- Does the estimate include installation?
- No — it prices material only. Underlayment, trim, removal, and labor are quoted separately and often exceed the material cost.
More ways to use this calculator
Start with the main square footage calculator or compare the other published scenarios.
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