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Contractors & trades / Square Footage Calculator

Square Footage Calculator

Find the square footage of a room, several rooms, a lot or an odd shape, then price the job with material, labor and markup and see your price per square foot.

Enter a number of at least 0

For 15 ft 6 in, enter 15.5.

Enter a number of at least 0

%

Enter a number from 0 to 100%

About 10% for flooring and tile laid straight, 15% for diagonal layouts.

$

Enter a number of at least 0

What you pay for flooring, sod, pavers or other material per square foot.

Turn on to price the job and see your price per square foot.

h

Enter a number from 0 to 10000

Total crew hours for the job.

$

Enter a number of at least 0

What one crew hour costs you, including payroll taxes.

%

Enter a number from 0 to 500%

Added on top of materials + labor. A 20% markup is a 16.7% margin.

Job price
$1,311.60
180sq ft
$7.29price per sq ft
16.72sq meters
$0job price $1,311.60
  • Materials
  • Labor
  • Profit
Area · 20 sq yd · 16.72 m²180 sq ft
Material to buy · with 10% extra198 sq ft
Materials · 198 sq ft × $3.50$693.00
Labor · 8 h × $50.00$400.00
Markup · 20% on cost$218.60
Job price$1,311.60

That is $7.29 per sq ft installed, with profit at 16.7% of the price.

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A one-page PDF for your customer, filled in from the numbers above. Your markup isn't shown.

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How the square footage calculation works

  1. Rectangles: length × width

    Measure in feet and convert inches to decimals (6 in = 0.5 ft). A 15 × 12 ft room is 180 sq ft.

  2. Split odd shapes into simple ones

    An L-shaped room is two rectangles added together. A circle is 3.1416 × radius², and a triangle is base × height ÷ 2.

  3. Add rooms together

    For a whole floor, measure each room and add them: 15 × 12, 12 × 10 and 10 × 8 ft rooms are 180 + 120 + 80 = 380 sq ft.

  4. Buy more material than the floor area

    Add about 10% for cuts and waste. 180 sq ft becomes 198 sq ft of flooring to buy.

  5. Price per sq ft = job price ÷ area

    Divide your full job price by the measured area, not the area with waste, to compare with what others quote per square foot.

Worked example. A 15 × 12 ft room is 180 sq ft. With 10% waste you buy 198 sq ft, which costs $693 at $3.50 per sq ft. With 8 labor hours at $50 ($400) and a 20% markup ($218.60), the job price is $1,311.60, or $7.29 per sq ft.

Square Footage FAQ

How do I calculate square footage?

Multiply length by width in feet. For odd shapes, split the space into rectangles, triangles and circles, work out each area and add them up.

How do I convert inches to feet for square footage?

Divide inches by 12 before multiplying. 12 ft 6 in is 12.5 ft, so a 12 ft 6 in × 10 ft room is 125 sq ft.

How many square feet is a 12 × 12 room?

144 sq ft, which is 16 sq yd or about 13.4 square meters.

How do I calculate price per square foot?

Divide the total job price by the area. A $1,311.60 job on 180 sq ft is $7.29 per sq ft. Use the measured area without waste.

How do I calculate the square footage of a house?

Measure each room and hallway, work out each area and add them up, as in the several-rooms mode. Listings and appraisals may count only finished living space, so check how a quoted figure was measured.

How do I convert square meters to square feet?

Multiply square meters by 10.764. 20 m² is about 215.3 sq ft. To go back, multiply square feet by 0.0929: 180 sq ft is about 16.72 m². The result above shows both, plus square yards.

How many square feet are in an acre?

43,560 sq ft. Divide a lot's square footage by 43,560 to get acres.

How much extra flooring should I buy?

About 10% for straight layouts and 15% for diagonal or herringbone patterns, plus a spare box for future repairs.

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