面積計算ツール
部屋、土地、形状の面積を計算
出典と方法論
How to Use the Square Footage Calculator
Calculate the area of any space in square feet, whether it's a room, yard, or land parcel. Our calculator supports rectangles, circles, triangles, and L-shaped areas with instant conversions to square meters and acres. This is the first step for most home improvement projects.
Measurement Tips
- Measure length and width at the longest points for rectangles
- For circles, measure across the widest point (diameter)
- For L-shapes, break the area into two rectangles
- Always measure in the same units (feet or meters)
Common Applications
Square footage calculations are essential for flooring, painting, landscaping, real estate, and construction projects. Accurate measurements help you estimate materials, costs, and labor requirements.
Unit Conversions
- 1 square foot = 0.0929 square meters
- 1 acre = 43,560 square feet
- 1 square yard = 9 square feet
Use Your Measurements
Once you have your square footage, use these calculators: paint calculator for walls, tile calculator for floors, mulch calculator for landscaping, concrete calculator for patios, drywall calculator for walls, and roofing calculator for your roof.
よくある質問
Multiply length by width in feet. A 12x14 foot room = 168 square feet. For irregular rooms, divide into rectangles, calculate each, and add together. Our calculator supports multiple shapes including rectangles, triangles, and circles.
Measure each room length and width, calculate square footage, and sum all rooms. Include hallways and closets. Typically, garages, unfinished basements, and porches are not included in living square footage.
Divide square feet by 43,560. A 10,000 sq ft lot = 0.23 acres. For square meters to square feet, multiply by 10.764. One acre equals about 0.4 hectares.
Calculate room square footage (length x width), then add 10% for waste and cuts. A 150 sq ft room needs about 165 sq ft of flooring. Add more (15-20%) for diagonal patterns or multiple rooms requiring transitions.
Multiply wall height by width. An 8-foot high, 12-foot wide wall = 96 square feet. For rooms, calculate perimeter x height, then subtract doors (about 20 sq ft each) and windows (about 15 sq ft each).
Use the formula: Area = pi x radius^2. For a circular area 10 feet in diameter (5-foot radius): 3.14159 x 5^2 = 78.5 square feet. Our calculator handles circular areas automatically.
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