Flooring Calculator

Estimate the area and total material cost of flooring for a rectangular room. Free, instant, no signup.

Formula: Area = length × width | Cost = area × price per sq ft

How to use the Flooring Calculator

  1. Enter your values. Fill in the fields with your numbers.
  2. Calculate. Press Calculate to run the flooring calculator.
  3. Use the result. Copy the result or try a related tool next.

Why use our Flooring Calculator

Instant results. Enter your figures and the flooring calculator returns an answer in seconds.
Free & private. Runs in your browser — no signup, and nothing is sent to a server.
Accurate. Uses standard formulas so you can rely on the numbers.

Free to use — premium coming soon

FREE
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  • Instant results
  • No signup
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About the Flooring Calculator

The Flooring Calculator turns the dimensions of a room into the practical numbers you need before buying hardwood, laminate, vinyl plank, or tile: total square footage, the amount to order once waste is added, and how many boxes that works out to. Instead of multiplying length by width in your head and guessing at extras, you enter the room measurements and a waste percentage, and the tool returns a clean order quantity. It is built for anyone standing in a half-empty room with a tape measure, trying to avoid the two classic mistakes: running short mid-install or paying for boxes you will never open.

Reach for this calculator when you are pricing a renovation, comparing quotes from installers, or buying material yourself from a store that sells by the box. It is especially useful because flooring is almost never sold in the exact square footage you need: a box covers a fixed amount (often 18 to 25 sq ft for laminate and hardwood, 20 to 30 for vinyl plank, and 10 to 16 for tile), so your real cost depends on how many full boxes that rounds up to. The calculator also helps when a room is not a simple rectangle. Split an L-shaped space into rectangles, calculate each, and add the results together.

Under the hood the math is straightforward. The base area is length times width. The tool then applies your chosen waste factor with the formula Material Needed = Area x (1 + Waste %), and finally divides by the coverage printed on the flooring label to get Boxes = Material Needed / Coverage per Box, always rounding up because you cannot buy a partial box. A typical 15 by 20 ft room is 300 sq ft; at 10% waste that is 330 sq ft, and at 22 sq ft per box you need 15 boxes. Waste covers off-cuts, pattern matching, and the occasional damaged plank.

Accuracy depends entirely on your measurements and the coverage figure for the specific product, so measure each wall at its widest point, round up to the nearest inch, and copy the box coverage from the actual label rather than a generic average. Treat the box count as a minimum and consider keeping one extra box as attic stock for future repairs, since dye lots change between production runs. The calculator runs entirely in your browser, with no measurements, room sizes, or project details sent to a server or stored anywhere, so your renovation plans stay on your device.

Frequently asked questions

How much extra flooring should I add for waste?

For a standard straight installation in a rectangular room, 10% is a safe default, with 5-7% acceptable for simple square rooms. Diagonal layouts need roughly 12-15%, and herringbone or rooms with many angles can need 18-20%.

How do I calculate the square footage of an irregular or L-shaped room?

Divide the room into separate rectangles, calculate the area of each one (length times width), then add all the areas together. Enter that total as your area, or run the calculator for each section and sum the results.

How does the calculator know how many boxes I need?

It divides the waste-adjusted square footage by the coverage per box printed on your product label, then rounds up to the next whole box because partial boxes are not sold. Always use the exact coverage from the box you intend to buy.

Should I buy an extra box beyond what the calculator says?

Yes, keeping one spare box as attic stock is a common recommendation. Dye and grain vary between production runs, so a box from the same lot is the best match for repairing scratches or water damage years later.

Does the waste percentage change for tile versus planks?

The waste principle is the same, but tile patterns and large-format pieces often produce more off-cuts, and tile boxes cover less area (commonly 10-16 sq ft). Increase the waste factor for diagonal tile layouts and complex room shapes.

From our blog

How to Calculate Your Daily Protein Target (and Actually Hit It)

By the Super Simple Digital Tools Team · Updated June 2026

Most people either guess at protein or default to the headline RDA number, and both lead to misses. The honest first step is choosing the right activity level. The 0.8 g/kg Recommended Dietary Allowance is a minimum to prevent deficiency in sedentary adults, not an optimal target for someone who lifts weights three times a week. Being truthful about your real activity, not your aspirational schedule, is what makes the calculator's output trustworthy.

Once you have your target, the next challenge is distribution. A daily figure like 120 grams is easier to reach when spread across the day rather than crammed into dinner. Splitting protein into three or four meals of roughly 25 to 40 grams each keeps muscle protein synthesis stimulated through the day and is far more achievable than a single huge serving. This also explains why breakfast matters: many people under-eat protein in the morning and then cannot catch up by evening.

Translating grams into food is where the plan becomes real. As rough anchors, a chicken breast holds around 30 to 40 grams, a large egg about 6, a cup of Greek yogurt roughly 20, a scoop of protein powder 20 to 25, and a cup of cooked lentils around 18. Knowing a handful of these values lets you assemble meals to your target quickly without weighing every ingredient or logging obsessively.

Plant-based eaters can hit the same numbers but should pay attention to variety. Combining sources such as legumes, soy, grains, nuts, and seeds across the day covers the full range of essential amino acids. Soy, in particular, is a complete protein, and tofu, tempeh, edamame, and lentils make reaching a higher target straightforward without animal products.

Finally, treat your calculated number as a hypothesis to test, not a rule carved in stone. Aim for it consistently for two to four weeks, then judge the results against how you recover, train, and feel. If you are constantly hungry, losing strength, or struggling to recover, nudge intake up within the recommended range. The calculator gives you a credible starting point; your own response over time fine-tunes it.

  • Set the activity level to match your real weekly routine, not your best week, so the target reflects how you actually train.
  • Divide your daily goal into three or four meals of about 25 to 40 grams each rather than backloading protein at dinner.
  • Memorize the protein content of five staples you eat often so you can build meals to your target without constant tracking.
  • Recalculate after a meaningful weight change, since a target tied to body weight drifts as you gain or lose pounds.

Read the full guide →

Tool by the Super Simple Digital Tools Team. Reviewed by our editorial team. Free to use, no signup required.

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