免费基础底脚计算器
计算建筑基础底脚的尺寸和混凝土用量。
Minimum Footing Area
10.0 sq ft
Minimum Footing Area vs Total Load on Footing
公式
## Footing Sizing **Footing Area = Total Load / Soil Bearing Capacity** The bearing capacity depends on soil type: soft clay 1,000 psf, medium clay/loose sand 2,000 psf, dense sand/gravel 3,000-4,000 psf, bedrock 8,000+ psf. Always get a soil test for structural footings.
计算示例
20,000 lb column load on soil with 2,000 psf bearing.
- 01Area = 20,000 / 2,000 = 10 sq ft
- 02Square footing = sqrt(10) = 3.16 ft per side
- 03Use a 3.5 x 3.5 ft footing (12.25 sq ft) for safety.
常见问题
How deep should footings be?
Footings must extend below the frost line, which varies by region (12 in in the south to 48 in or more in northern states). Check your local building code for the required depth.
What if I do not know my soil bearing capacity?
A geotechnical soil test is the most reliable method. Without a test, most codes allow a presumptive value of 1,500-2,000 psf for undisturbed soil, but this is conservative.
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