精密計算機

平方フィート計算機のフィートとインチ

平方フィート計算機のフィートとインチ: Enter length and width as separate feet and inches fields — just like a tape measure reads — with no manual

部屋(フィート + インチ)
ft
in
ft
in

材料廃棄物係数オプション

材料費の見積りオプション

Calculation Results
1 ft (12 in) 1 ft 1 ft² = 144 in²

Area Calculator in Feet and Inches

Select the Room (Feet + Inches) or Rectangle (Feet + Inches) shape to enter each dimension exactly how a tape measure reads it — a whole-feet field and a separate inches field. For a wall measuring 10 ft 6 in, enter 10 in the feet field and 6 in the inches field. The calculator converts feet + inches ÷ 12 into decimal feet automatically before computing the area, so no manual conversion is needed.

Leave the inches field at 0 for measurements that land on an exact foot. Results display instantly in square feet, square inches, square yards, square meters, and acres.

仕組み

1

形状の選択

Choose the shape that matches your space.

2

寸法を入力してください

測定値を任意の単位で入力します。数量、廃棄係数、材料価格を追加します。

3

結果を取得する

面積 (ft²、in²、yd²、m²、エーカー) とコスト見積もりをすべて一度に表示します。

よくある質問

Select the Room (Feet + Inches) or Rectangle (Feet + Inches) shape. Each dimension has two fields — one for whole feet and one for extra inches. Enter 10 ft 6 in as 10 in the feet field and 6 in the inches field; no conversion is needed.
You don't have to — the calculator does it for you. Behind the scenes it converts each pair of feet-and-inches fields into decimal feet (feet + inches ÷ 12) before multiplying length by width.
Yes. If a room measures an exact number of feet with no extra inches, leave the inches field at 0 or blank. The calculator still computes the area correctly using just the feet value.
The most common mistake is adding feet and inches incorrectly. Remember: 12 inches = 1 foot, not 10. Another mistake is forgetting to convert fractions (e.g., 3/4 inch = 0.75 inches or 0.0625 ft). Always double-check conversions.
Divide square inches by 144 (since 12 × 12 = 144). For example, 1,440 sq in ÷ 144 = 10 sq ft. The calculator displays results in both square feet and square inches automatically, so no manual conversion is necessary.
結果をコピーしました!