Free area calculator

Bathroom Square Footage Calculator

Bathroom Square Footage Calculator: Measure bathroom floor or wall area for tile, flooring, and remodel planning. Add a waste percentage for

Room Dimensions

Material Waste FactorOPTIONAL

Estimate Material CostOPTIONAL

Calculation Results

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1 ft (12 in) 1 ft 1 ft² = 144 in²

Bathroom Square Footage Calculator: Tile, Renovation, and Remodel Estimates

Bathrooms use more tile per square foot than almost any other room. A full remodel can need tile for the floor, shower walls, shower floor, tub surround, and sometimes a wainscot around the perimeter. Each surface has its own area and waste rate. Get each surface right before you order, or you risk the most expensive mistake in bathroom work: running out of a discontinued tile halfway through.

This calculator handles the bathroom floor rectangle. For wall and shower tile, combine it with our wall calculator and tile calculator. Enter length and width for floor area in square feet and square metres, then add the tile waste percentage for your pattern.

ToiletVanity 48"Tub/Shower8-12 ft5-10 ft

Bathroom Size Categories

Bathroom sizes follow fixture count and layout. Knowing your category helps you benchmark renovation costs and material quantities before you collect quotes.

  • Powder room / half bath (toilet + sink only): 18-35 sq ft; typical 5'×7' = 35 sq ft
  • Three-quarter bath (toilet + sink + shower): 35-55 sq ft; typical 5'×8' = 40 sq ft
  • Full bath (toilet + sink + tub/shower combo): 40-80 sq ft; typical 5'×9' = 45 sq ft
  • Master bath with separate tub and shower: 80-150 sq ft
  • Luxury master bath: 150-300+ sq ft

Tile Coverage for Bathroom Floors

Bathroom floor tile is ordered in square feet, but grout joints and cut waste push the order above raw floor area. For 12"×12" tiles set square, add 10% waste. For 12"×24" tiles in a brick pattern, add 12%. For any diagonal layout, add 15%.

12"×12" tile grid, add 10% for waste

Shower and Tub Surround Tile Calculations

Shower wall tile is measured wall by wall. A standard 36"×36" shower with 8 ft walls has three walls at 3 ft × 8 ft = 24 sq ft each, for 72 sq ft of wall tile, plus a 3'×3' = 9 sq ft floor. Add 15% waste on shower floors for slope cuts and the drain area. A standard alcove tub surround (5 ft wide × 4.5 ft high on three sides) totals about 67 sq ft of tile.

Heated floor tile uses the same square footage math as unheated tile. You also need the heated mat coverage area, which skips space under vanities and toilet bases. Heated area is typically 60-75% of total floor area in a standard bathroom.

Related tools: tile calculator · wall calculator · paint calculator · room calculator

How It Works

1

Select Shape

Choose the shape that matches your space.

2

Enter Dimensions

Enter measurements in any unit. Add quantity, waste factor, and material price if you need them.

3

Get Results

See area in ft², in², yd², m², and acres, plus a cost estimate when you enter a price.

Frequently Asked Questions

Pick the shape from the dropdown: Room, Rectangle, Circle, Triangle (Heron's or base times height), Trapezoid, Cathedral Wall, Annulus, and others. Enter measurements and click Calculate. The calculator runs the right formula and shows square feet, square inches, square yards, square meters, and acres.
Yes. Every calculation shows five area units at once: square feet (ft²), square inches (in²), square yards (yd²), square meters (m²), and acres. You do not need a separate conversion step.
Measure each room, wall, or area in your project. Enter numbers in the calculator, pick the shape, and click Calculate. Add a waste percentage (5 to 15% depending on material), enter cost per unit area, and the calculator totals material quantity and cost.
The waste factor increases total area by a percentage to cover material lost in cutting and installation. Use 5 to 10% for standard flooring and carpet. Use 10 to 15% for diagonal tile or complex layouts. Enter the percentage in Material Waste Factor and the calculator adjusts total area.
Yes. Estimate area and material needs for gardens, walkways, patios, and lawns. Pick the shape that fits your space, enter dimensions, and get total square footage. Enter a material price to figure costs for sod, mulch, pavers, or gravel.
Divide square feet by 10.7639 to get square meters. Example: 500 ft² ÷ 10.7639 = 46.45 m². The calculator shows the m² equivalent on every run.
10 ft × 10 ft = 100 ft², which equals 9.29 m². A 10-by-10-foot room (3.048 m × 3.048 m) has about 9.29 square meters of floor area.
The formula is ½ × Base Width × (Left Height + Right Height). Left and right heights differ because the ceiling slopes. The shape is a right trapezoid. Enter base width and both wall heights for area in square feet.
Yes. Each input has its own unit selector: feet, inches, yards, meters, or centimeters. The calculator converts internally before computing area. Length in meters and width in feet still gives an accurate result.
Both use π × (R² − r²). Circle border and annulus both find the area between two concentric circles. The calculator lists both names because some people search "circle border" and others search "annulus." The result is the same.
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