Bathroom Square Footage Calculator. Bathroom Square Footage Calculator: Calculate bathroom square footage for tile, flooring, and renovation projects. Measure floor area and wall area.

Precision Calculator

Bathroom Square Footage Calculator — Tile & Floor

Bathroom Square Footage Calculator: Calculate bathroom square footage for tile, flooring, and renovation projects. Measure floor area and wall

Room Dimensions

Material Waste FactorOptional

Estimate Material CostOptional

Calculation Results

Explore Our Square Footage Calculators

Choose a specialized calculator for your exact project — rooms, shapes, materials, outdoor areas, and unit conversions.

Room Calculator → House Calculator → Bedroom Calculator → Bathroom Calculator → Kitchen Calculator → Multiple Rooms → Rectangle Calculator → Triangle Calculator → Circle Calculator → Trapezoid Calculator → Polygon Calculator → Irregular Shape → Odd Shape → Uneven Sides → Flooring Calculator → Tile Calculator → Paint Calculator → Concrete Calculator → Insulation Calculator → Lawn Calculator → Yard Calculator → Landscaping Calculator → Pool Calculator → Garage Calculator → Roof Calculator → Wall Calculator → Feet & Inches → Inches Calculator → Height Width Length → Sq Ft to Acres → Sq Ft to Cubic Yards →
1 ft (12 in) 1 ft 1 ft² = 144 in²

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

Bathrooms are the most tile-intensive rooms in any home. A single full bathroom remodel requires tile measurements for the floor, shower walls, shower floor, tub surround, and sometimes the entire perimeter wall as a wainscot. Each surface has a different area and different waste percentage. Getting the square footage of each surface right before you order tile prevents the most common (and expensive) remodeling mistake: running out of a discontinued tile mid-job.

This calculator handles the floor rectangle for the bathroom itself. For wall and shower tile estimates, use our wall calculator and tile calculator in combination. Enter your bathroom's length and width to get the floor area in square feet and square metres — then apply the tile waste percentage for your chosen pattern.

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

Bathroom Size Categories

Bathroom sizes follow a predictable hierarchy based on fixture count and configuration. Knowing which category your bathroom falls into helps you benchmark renovation costs and material quantities before you start getting 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 measured in square feet, but grout joints and cutting waste add material requirements beyond the raw floor area. For 12"×12" tiles set square, add 10% for waste. For 12"×24" rectangular tiles set 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 tiles require measuring each wall panel separately. A standard 36"×36" shower with 8 ft walls has three walls: 3 ft × 8 ft = 24 sq ft each, totalling 72 sq ft of wall tile, plus a 3'×3' = 9 sq ft floor. Add 15% waste for shower floors due to slope cuts and drain area. For a standard alcove tub surround (5 ft wide × 4.5 ft high on three sides), the total tiled area is approximately 67 sq ft.

Heated floor tile requires the same square footage calculation as unheated tile, but you additionally need to measure the heated mat coverage area, which excludes the footprint under vanities and toilet bases. The heated area is typically 60–75% of the total floor area in a standard bathroom.

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

How It Works

1

Select Shape

Choose from 13 shapes including rooms, walls, circles, triangles, and more.

2

Enter Dimensions

Input measurements in any unit. Add quantity, waste factor, and material price.

3

Get Results

View area in ft², in², yd², m², acres plus cost estimate — all at once.

Frequently Asked Questions

Select the shape from the dropdown — Room, Rectangle, Circle, Triangle (Heron's or base × height), Trapezoid, Cathedral Wall, Annulus, and more. Enter the required measurements and click Calculate. The calculator applies the correct formula automatically and returns results in square feet, square inches, square yards, square meters, and acres.
Yes, every calculation displays results in 5 area units at the same time: square feet (ft²), square inches (in²), square yards (yd²), square meters (m²), and acres. No separate conversion step is needed.
Measure each room, wall, or area in your construction project. Enter the measurements into the calculator, select the shape, and click Calculate. Add a waste percentage (5–15% depending on the material), enter a cost per unit area, and the calculator computes the total material quantity and cost.
The waste factor increases the total area by a percentage to account for material lost during cutting and installation. Use 5–10% for standard flooring and carpet. Use 10–15% for diagonal tile patterns or complex layouts. Enter the percentage in the Material Waste Factor field, and the calculator adjusts the total area automatically.
Yes, estimate the area and material needs for gardens, walkways, patios, and lawns. Select the shape that matches your space, enter the dimensions, and get the total square footage. Enter a material price to calculate costs for sod, mulch, pavers, or gravel.
Divide the square foot value by 10.7639 to get square meters. For example, 500 ft² ÷ 10.7639 = 46.45 m². The calculator displays the square meter equivalent automatically for every calculation.
10 ft × 10 ft = 100 ft², which equals 9.29 m². A 10-by-10-foot room (3.048 m × 3.048 m) has approximately 9.29 square meters of floor area.
The cathedral wall formula is ½ × Base Width × (Left Height + Right Height). The left and right wall heights differ because the ceiling slopes. The shape is a right trapezoid. Enter the base width and both wall heights into the calculator to get the area in square feet.
Yes. Each input field has its own unit selector — feet, inches, yards, meters, or centimeters. The calculator converts all values internally before computing the area. You can enter the length in meters and the width in feet, and the calculation will be accurate.
Both use the same formula: π × (R² − r²). The circle border and annulus both calculate the area between 2 concentric circles. The calculator includes both names — some users search for "circle border" while others search for "annulus." The result is identical.
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