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Square footage is the easy part — the waste factor is where DIY orders go wrong. This calculator applies the right allowance for your material and layout, then converts to boxes or carpet-roll footage.
Everything updates live — no submit button, no email gate.
Add up every room, closet, and hallway that gets the new floor.
Angled and pattern layouts create more offcuts at every wall — the waste factor rises accordingly.
Methodology
Order quantity = measured area × (1 + waste factor), rounded up to whole boxes. The waste factors are typical industry figures our installers plan around: 5% for straight-lay LVP or laminate in simple rooms, 10% for hardwood or any diagonal layout, and 10–15% for tile and herringbone (this tool uses 12.5% for straight tile and 15% for herringbone). Complex rooms — lots of closets, angled walls, hallway jogs — belong at the top of the range.
Broadloom carpet ships on 12-foot-wide rolls. A 10-foot-wide bedroom still consumes the full 12-foot width, and seams have to run away from windows and traffic lanes — so the order is linear feet of roll, and odd room shapes waste more than big square ones. That's also why carpet quotes from a measure are more accurate than any calculator.
In a climate with 36 inches of rain a year and roughly 75% average humidity, underlayment is moisture strategy, not just cushioning. Over crawlspaces and daylight-basement slabs we spec vapor-rated underlayment or a separate barrier ($0.35–$1.10/sq ft on our published schedule). Many LVP lines include attached pad — those that don't still need the right pad for the subfloor beneath them.
Common questions
Typical figures: 5% extra for straight-lay LVP/laminate, 10% for hardwood or diagonal layouts, 10–15% for tile and herringbone. Then round up to whole boxes and keep a spare box — matching a discontinued product three years later is far harder than storing 20 sq ft in the garage.
Dye lots and embossing runs vary between production batches, so a top-up box bought later may not match — noticeably, in raking window light. In Bellingham's older homes with out-of-square rooms, under-ordering is the most common DIY mistake we get called to rescue.
No — stairs are measured per tread, not by area, and usually use different components (tread caps, stair noses). Our Cost Calculator handles stairs as a separate line item.
Yes — especially here. Bellingham's ~75% average humidity means wood delivered from a dry warehouse will move after delivery. We acclimate hardwood on site to NWFA moisture spec before a single board goes down; skipping it is how gaps and cupping start.
Happily — the measure is free, includes a subfloor moisture reading, and produces a written line-item quote. Call or text (360) 873-5667.
Free on-site measure with a moisture check — your calculator numbers come with the request. Most homeowners hear back within 15 minutes.
Your room details came through with the request. Prefer to talk now? (360) 873-5667