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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.
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Add up every room, closet, and hallway that gets the new floor.
Angled and pattern layouts create more offcuts at every wall, so 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) 639-5973.
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) 639-5973