Rooms To Floor1 ROOM
Enter a room to begin.
One room? Just type it, the math runs live. More than one? Name it and add it to the list, then measure the next one. Closets and hallways count as their own small rooms.
Rooms in this job
Material & Box Size#BOXES
Baseboard & TransitionsLIN FT
Perimeter comes straight from the rooms above. Tell us how many doorways so we can take them out of the baseboard run and add a transition strip for each one.
Plan ViewSTRAIGHT
Diagram redraws to your real proportions and previews the plank direction for the pattern you picked below.
ResultsLIVE
Boxes to buy
0 boxes
Enter a room to begin
Enter a room and the full working shows here, with your own numbers in it.
Waste allowance — matched to your install pattern
Materials Ticket#FLOOR
Enter a room to build your ticket.
Hand the BOXES TO BUY line to the person at the counter. It is the only number that matters once you are in the store, and it already includes your waste allowance.
How This Is Calculated
No hidden steps. Every figure above comes from these five lines:
- Base area = length x width for each room, added together. Feet and inches are converted as feet + inches / 12, so 12 ft 6 in is 12.5 ft, never 126.
- Waste added = base area x waste percentage. It is shown on its own line and never folded into the base area.
- Total to buy = base area + waste added.
- Boxes to buy = total to buy / square feet per box, rounded up to the next whole box. You cannot buy 4.3 boxes.
- Leftover = (boxes x square feet per box) - total to buy. That is the surplus above your target, and it is your repair stock.
Perimeter is 2 x (length + width) per room, added up. Baseboard is the perimeter minus your doorway openings, plus 10% for miter cuts and mistakes. Transition strips are one per doorway.
Square feet per box is not a standard. It is printed on the carton and it changes between product lines from the same brand, so we ask you for it rather than guessing. The quick-reference table below gives the usual ranges only as a sanity check.
Quick ReferenceSCREENSHOT ME
Typical coverage per box by material
| Material | Usual sq ft per box | Usual waste | Watch out for |
|---|---|---|---|
| Laminate | 18 - 26 | 5 - 10% | Thicker AC5 boards come in smaller cartons. Check the box, not the shelf tag. |
| Vinyl plank (LVP / SPC) | 18 - 30 | 5 - 10% | Rigid core boxes are heavy and often hold fewer square feet than laminate. |
| Engineered hardwood | 20 - 30 | 10% | Wide plank cartons vary the most. Mixed-width packs cover less than they look. |
| Solid hardwood | 18 - 25 | 10 - 15% | Sold by the bundle, and bundles are often not full. Racking waste is real. |
| Tile | 10 - 20 | 10 - 20% | Large format tile wastes more. Use the tile calculator for tile counts. |
| Carpet | sold by the sq yd | 10 - 20% | Fixed roll widths, usually 12 ft. A 13 ft room forces a seam and a lot of offcut. |
These are the ranges you will see on retail shelves in the United States. They are a sanity check, not a spec. Always read the carton for the product you are actually buying.
Waste allowance by install pattern
| Pattern / room | Waste | Why |
|---|---|---|
| Straight lay, simple square room | 5% | Almost every offcut from the end of a row starts the next row. |
| Straight lay, typical room | 10% | Doorways, a closet, a jog or two, plus a board or three that arrive damaged. |
| Diagonal, or a room with many angles | 15% | Every board meets the wall at an angle, so both ends of the cut are scrap. |
| Herringbone or chevron | 20% | Chevron needs mitered ends and left and right boards. Some installers ask for 25%. |
| Long narrow hallway runs | 15% | Nothing to reuse a short offcut in. Waste stacks up fast. |
Related Calculators
Same house rules on every one: feet and inches, waste on its own line, and units to buy rather than a bare square footage.
- Square FootageL-shapes & odd rooms
- TileTiles, boxes, grout
- SidingSquares & boxes
- PaintGallons per coat
- DrywallSheets, mud, tape
- ConcreteBags & yards
- DeckBoards & joists
- InsulationBatts & R-value
- PaversPavers, sand, base
- RoofingSquares & bundles
- GravelTons & yards
- Cubic YardAny depth of fill
- FencePosts, rails, pickets
- Tile LayoutsPattern guide
Flooring Calculator FAQ
How many boxes of flooring do I need?
How many boxes of flooring do I need?
Take your floor area, add the waste allowance, then divide by the square feet printed on the box and round up. For 500 sq ft at 10% waste with 22.5 sq ft per box: 500 + 50 = 550 sq ft to buy, 550 / 22.5 = 24.4 boxes, so you buy 25 boxes. Those 25 boxes cover 562.5 sq ft, leaving 12.5 sq ft spare on top of the waste allowance you already added.
Always round up to a whole box. Stores will not sell a partial box, and a second trip a week later can land you a different production batch with a visible shade difference.
How much waste should I add for flooring?
How much waste should I add for flooring?
Waste is driven by the install pattern far more than by the material. Straight lay in a plain rectangular room wastes very little because the offcut from the end of one row starts the next row, so 5% is genuinely enough. A normal room with a doorway, a closet and a jog wants 10%. Diagonal installs and rooms with many angles want 15% because both ends of every board become scrap. Herringbone and chevron want 20% or more.
Those are installer rules of thumb rather than a published standard, which is exactly why the percentage here is a button you can override rather than a number baked into the answer.
Should I include closets and under appliances?
Should I include closets and under appliances?
Include every reach-in closet: flooring almost always runs into them and they are cheap to cover. Include the space under a refrigerator and a freestanding range, because floating floors need continuous support and you will want the option to slide the appliance out later.
Exclude a permanent kitchen island base, a built-in cabinet run and a tub footprint, since flooring stops at the toe kick. If in doubt, include it. The cost of 20 extra square feet is far less than the cost of running short.
What do I do with the leftover flooring?
What do I do with the leftover flooring?
Keep it. Flat, indoors, in the same conditions as the installed floor. A partially used box of planks is the only realistic way to repair a water stain or a gouge years later, because product lines are discontinued constantly and dye lots shift even while a line is still sold.
If a store allows returns on unopened boxes, buy the calculated number, open only what you need, and take the unopened surplus back at the end. Confirm the return window before you buy: many flooring returns are 30 days and some special orders are final.
How much baseboard and transition strip do I need?
How much baseboard and transition strip do I need?
Baseboard follows the perimeter of the room, which is 2 x (length + width), minus the width of each doorway opening, plus roughly 10% for miter cuts and for the piece you will inevitably cut short. This calculator does that math and also converts it into whole 8, 12 or 16 ft sticks.
Transition strips are one per doorway or per change of flooring type: T-molding between two floors of the same height, a reducer where you step down to vinyl, and a threshold at an exterior door. Most are sold in 36 in or 72 in lengths, so one length usually covers one standard doorway.
Is carpet measured the same way?
Is carpet measured the same way?
The area math is identical, but carpet is quoted by the square yard, and 1 square yard equals 9 square feet. Pick Carpet as the material above and the results switch to square yards.
The bigger difference is roll width. Broadloom comes off a roll in a fixed width, usually 12 ft, so a room 13 ft wide needs a 12 ft piece plus a seamed strip, and the real waste can exceed 30%. Ask the store to do a roll-width layout before you buy and treat this calculator's square yard figure as the sanity check on their quote.
Why does the tool ask me for square feet per box?
Why does the tool ask me for square feet per box?
Because there is no standard box size, and any calculator that assumes one is guessing with your money. Two laminate lines from the same manufacturer can be 19.83 and 24.17 sq ft per carton. The number is printed on the end of every box and on the product page of every retailer.
Enter that number and the box count is exact. If you are still shopping, use the quick-reference ranges above to get a rough idea, then come back and put the real figure in before you buy.