Строительство
Проверенный калькулятор с прозрачной формулой
Concrete Footing Calculator.
Estimates the volume of concrete needed for a rectangular footing and the number of 60-lb or 80-lb bags required.
Ваши данные
Как это работает
- 1
Measure the length, width, and depth of the footing in feet.
- 2
Multiply length × width × depth to get the volume in cubic feet.
- 3
Convert cubic feet to gallons by multiplying by 7.48051948.
- 4
Divide the gallons by the yield per bag (0.45 for 60 lb, 0.6 for 80 lb) and round up to get the number of bags.
length * width * depth * 7.48051948Часто задаваемые вопросы
How much concrete does a 60 lb bag make?
A 60 lb bag of concrete mix yields about 0.45 cubic feet (3.36 gallons) when mixed with water.
How much concrete does an 80 lb bag make?
An 80 lb bag yields about 0.6 cubic feet (4.49 gallons).
Should I order extra concrete?
It's wise to add 5-10% extra to account for spillage, uneven subgrade, or variations in footing dimensions.
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Результаты
Формула проверенаОценка только для общего руководства — проверяйте важные решения с соответствующим специалистом.
Как это работает
Estimates the volume of concrete needed for a rectangular footing and the number of 60-lb or 80-lb bags required.
- Measure the length, width, and depth of the footing in feet.
- Multiply length × width × depth to get the volume in cubic feet.
- Convert cubic feet to gallons by multiplying by 7.48051948.
- Divide the gallons by the yield per bag (0.45 for 60 lb, 0.6 for 80 lb) and round up to get the number of bags.
Формулы
Математика, лежащая в основе этого калькулятора, изложена так, чтобы вы могли проверить результат.
Volume of rectangular footing
Multiply the length, width, and depth of the footing to get the volume in cubic feet.
Example:
Input: L = 4 ft, W = 2 ft, D = 1 ft
Calculation: 4 × 2 × 1 = 8 ft³
Result: 8 cubic feet
Bags of concrete
Divide the total volume by the yield of one bag (0.45 ft³ for 60 lb, 0.6 ft³ for 80 lb) and round up.
Example:
Input: V = 8 ft³, 60 lb bags
Calculation: 8 / 0.45 = 17.78 → 18 bags
Result: 18 bags
Примеры из реальной жизни
Где этот расчет встречается в повседневной жизни.
Deck footings
Calculate concrete needed for deck support footings to ensure a stable base.
Example: A 4×2×1 ft footing for a deck post.
Fence posts
Determine concrete volume for setting fence posts in concrete footings.
Example: A 1×1×2 ft footing for a fence post.
Shed foundation
Estimate concrete for a shed foundation footing to avoid over-ordering.
Example: A 10×3×1.5 ft footing for a small shed.
Советы и частые ошибки
Tips
- Always measure in feet and keep consistent units.
- Add 5-10% extra concrete to account for waste and spillage.
- Check the bag yield on the product label; it may vary slightly by brand.
- For irregular shapes, break the footing into rectangles and sum the volumes.
Common Mistakes to Avoid
- Forgetting to convert inches to feet (divide by 12).
- Using the bag yield in cubic feet but calculating volume in cubic yards.
- Not rounding up the number of bags, leading to a shortage.
Допущения и ограничения
- Use the stated inputs and units.
- Results are estimates for planning and education.
- Check measurements and source data before making an important decision.