Square Footage Calculator — Calculate the area of a single room from its length and width, or add up the area of multiple rooms for a whole-floor total. The calculator returns square feet and square meters regardless of which unit you enter, so you can plan flooring, paint, or landscaping without converting numbers by hand.
All measurements stay in your browser.
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Square Footage Calculatorとは？
Calculate the area of a single room from its length and width, or add up the area of multiple rooms for a whole-floor total. The calculator returns square feet and square meters regardless of which unit you enter, so you can plan flooring, paint, or landscaping without converting numbers by hand.
Use the single-room mode for a quick estimate. Use the multi-room mode when you have an actual floor plan or a list of room dimensions.
使い方
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Pick a unit
Feet, meters, yards, inches, or centimeters.
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Single room: enter length and width
Get the area in your unit, plus square feet and square meters.
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Whole floor: add rooms
Each row sums to a grand total in square feet and square meters.
使用例
12 ft × 10 ft bedroom
Single-room mode.
結果： 120 ft² · 11.15 m²
Three rooms: 18×14, 12×10, 14×12 ft
Whole-floor mode.
結果： 500 ft² · 46.45 m²
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Last reviewed: 2026-09-25