1. Measure the floor
Measure length and width in feet. Record shower stalls and vanity nooks as separate sections.
計算機ワークスペース
バスルームの寸法を入力して、総平方フィートを計算し、フローリング材料を見積もり、プロジェクトを計画します。
バスルーム平方フィート計算機を使用してバスルームの面積を計算します。バスルームの寸法を入力し、平方フィート、平方ヤード、平方メートル、エーカーで即時結果を取得。内蔵のコスト計算でフローリング、カーペット、タイルの材料ニーズを見積もります。
プロジェクトに合った専門の計算機を選んでください — 部屋、形状、材料、屋外エリア、単位変換。
Bathroom square footage is the total floor area of a bathroom measured in square feet. A standard full bathroom is 36-50 sq ft (3.3-4.6 m²). A half bath is 18-24 sq ft. A master bathroom is 60-160 sq ft.
Getting started
To calculate bathroom square footage, measure length and width of the bathroom floor in feet and multiply length × width. A 5 × 8 ft (1.52 × 2.44 m) bathroom equals 40 sq ft (3.7 m²). Subtract bathtub and shower base footprints from floor area for tile estimates.
Measure length and width in feet. Record shower stalls and vanity nooks as separate sections.
Subtract bathtub and shower base footprint from the floor area for tile or vinyl coverage.
Add 10-15% extra tile for cuts around fixtures. Diagonal patterns need 15-20% extra.
Quick reference
Material pricing
Bathroom tile costs $7-25 per sq ft installed. Multiply bathroom area by the unit price to get total tile cost.
There are 2 steps to calculate material cost:
A 40 sq ft bathroom needs about 44-46 sq ft of tile (10-15% waste factor). Order 1-2 extra boxes from the same dye lot for future repairs.
FAQ
A standard full bathroom is 36-50 square feet. A half bath is typically 18-24 sq ft. A master bathroom can be 60-160 sq ft or more.
A 5x8 bathroom is 40 square feet (5 ft x 8 ft = 40 sq ft). This is one of the most common full bathroom sizes.
Calculate the bathroom square footage and add 10-15% for cuts and waste. A 40 sq ft bathroom needs approximately 44-46 sq ft of tile.
Yes, the area under the bathtub is included in total bathroom square footage. However, for tiling projects, subtract the bathtub footprint from the floor area since you won't tile under it.
Measure the height and width of each wall, multiply for wall area, then subtract windows and doors. Use the Wall with Window calculator for walls with openings.
Most building codes require a minimum of 15-18 square feet for a half bath with a toilet and sink. A full bathroom with a shower needs at least 36 square feet.
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