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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.

LIFESTYLE

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.

Square Footage Calculator

Calculate the square footage of one or more rooms in feet, inches, yards, or meters. Add multiple rooms for a whole-house total, and get instant material estimates for flooring, carpet, and paint.

Input Units

Rooms

Room Name

Length (ft)

Width (ft)

Room Name

Length (ft)

Width (ft)

Room Name

Length (ft)

Width (ft)

Flooring Cost per Sq Ft ($)Vinyl: $2-5, Laminate: $3-7, Hardwood: $6-15, Tile: $5-15.

Waste Allowance (%)Typically 10% for straight rooms, 15-20% for diagonals and patterns.

Paint Coverage (sq ft per gallon)Standard interior paint: 350 sq ft/gal. Walls only - this calc treats floor area as a quick paint proxy.

Total Square Footage

554sq ft

Square Meters51.47 m²

Square Yards61.56 yd²

By Room

Room	Dimensions	Sq Ft
Living Room	18 × 14 ft	252
Kitchen	12 × 10 ft	120
Master Bedroom	14 × 13 ft	182

Material Estimates

Flooring Needed (with waste)609 sq ft

Estimated Flooring Cost$3,656

Paint Needed (1 coat)1.6 gal

Paint Needed (2 coats)3.2 gal

Tips for Accurate Measurements

Use a long tape measure (25 ft+) and round each dimension to the nearest inch. For irregular rooms, break them into rectangles - measure each rectangular section separately and sum the results. For L-shaped rooms, two rectangles is usually enough.

Always add a waste allowance when buying flooring or carpet: 10% for straight rectangular rooms, 15% for diagonal patterns or non-square rooms, and 20% for herringbone or chevron patterns. Subtract permanent fixtures (kitchen islands, built-in cabinetry) larger than ~10 sq ft.

Note that real-estate listings report "heated square footage" or "gross square footage" using exterior wall measurements, which adds 5-8% to interior usable space. The number you calculate here is interior usable square footage - the right number for flooring, paint, and furnishing.

Estimate only. Always re-measure twice before ordering materials. Flooring and paint prices vary by region, brand, and season.

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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.

Square Footage Calculator

Square Footage Calculator

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By Room

Material Estimates

Tips for Accurate Measurements

Frequently Asked Questions

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