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Square Footage Calculator

Calculate square footage of one or many rooms in feet, inches, yards, or meters. Includes flooring cost, waste allowance, and paint coverage estimates.

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Calculate the square footage of one or more rooms in feet, inches, yards, or meters. Add as many rooms as you need for a whole-house total, plus instant material estimates for flooring (with waste allowance), paint coverage, and flooring cost.

For each room, enter a name, length, and width in your chosen units. The calculator converts everything to feet, computes individual room sqft, and produces a total in sq ft, sq m, and sq yards. Materials estimates: flooring with adjustable waste % (10% straight, 15-20% diagonal), flooring cost at your $/sqft input, and paint gallons for one or two coats at 350 sq ft per gallon (configurable).

Disclaimer: Estimates assume rectangular rooms. For L-shapes and irregular spaces, break into rectangles and add separately. Always re-measure before ordering materials and add extra waste if your floor pattern requires special cuts.
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Frequently Asked Questions

How do I calculate the square footage of my room?
For a rectangular room, multiply length × width with both in feet. A room measuring 12 ft × 14 ft is 168 sq ft. For inches, divide by 12 first or use the calculator's mixed-unit input. For irregular rooms, break them into rectangles and add: an L-shape is two rectangles, an alcove is the main room plus or minus the alcove area.
How much flooring should I buy for my project?
Take the total square footage and add a waste allowance: 10% for straight rectangular rooms, 15% for diagonal patterns or non-square rooms, 20% for herringbone or chevron. For a 250 sq ft room with a diagonal pattern, order 250 × 1.15 = 288 sq ft. Better to have leftover for repairs than to come up short and risk a dye-lot mismatch.
How many gallons of paint do I need for my room?
One gallon of interior paint covers about 350 sq ft per coat. Most rooms need two coats. For a 150 sq ft room, that is 150 × 2 / 350 = 0.86 gallons - buy 1 gallon to be safe. For a whole house (2,000 sq ft of wall area), two coats = 4,000 / 350 ≈ 11.4 gallons. Add 10% if you are changing colors dramatically.
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