Cement Calculator
Calculate cement, sand, and gravel for concrete mixing.
Volume (cu ft) = Length x Width x (Depth / 12)\nVolume (cu yd) = Volume (cu ft) / 27\nCement Bags = Volume (cu yd) x Bags per CY\nSand = Volume x (Sand Ratio / Total Parts)\nGravel = Volume x (Gravel Ratio / Total Parts)
Example:\n10 ft x 10 ft x 4 inch thick\nMix: 1:2:4 (Standard)\n\nVolume = 10 x 10 x (4/12) = 33.33 cu ft = 1.23 cu yd\nCement = 1.23 x 5.5 = approx 7 bags (94 lb)\nSand = 33.33 x (2/7) = 9.52 cu ft\nGravel = 33.33 x (4/7) = 19.05 cu ft
What is cement vs concrete?
Cement is the powder that binds. Concrete is the mixture: cement + sand + gravel + water. This calculator is for concrete made with cement.
What do the ratios mean?
1:2:4 means 1 part cement, 2 parts sand, 4 parts gravel by volume. Common for general construction. 1:2:3 is stronger.
How many bags per cubic yard?
Standard mix (1:2:4): about 5-6 bags of 94 lb cement per cubic yard. Varies with mix ratio and desired strength.
What size is a cement bag?
Standard bag is 94 lb (1 cubic foot). Smaller 60 lb and 80 lb bags are also common. Adjust quantity accordingly.
Should I add extra for waste?
Yes, add 5-10% for spillage, uneven sub-base, and calculation variations.
🔗 Related Calculators
📐 Formula
Volume (cu ft) = Length x Width x (Depth / 12)\nVolume (cu yd) = Volume (cu ft) / 27\nCement Bags = Volume (cu yd) x Bags per CY\nSand = Volume x (Sand Ratio / Total Parts)\nGravel = Volume x (Gravel Ratio / Total Parts)
📝 Example Calculation
Example:\n10 ft x 10 ft x 4 inch thick\nMix: 1:2:4 (Standard)\n\nVolume = 10 x 10 x (4/12) = 33.33 cu ft = 1.23 cu yd\nCement = 1.23 x 5.5 = approx 7 bags (94 lb)\nSand = 33.33 x (2/7) = 9.52 cu ft\nGravel = 33.33 x (4/7) = 19.05 cu ft
❓ Frequently Asked Questions
What is cement vs concrete?▼
Cement is the powder that binds. Concrete is the mixture: cement + sand + gravel + water. This calculator is for concrete made with cement.
What do the ratios mean?▼
1:2:4 means 1 part cement, 2 parts sand, 4 parts gravel by volume. Common for general construction. 1:2:3 is stronger.
How many bags per cubic yard?▼
Standard mix (1:2:4): about 5-6 bags of 94 lb cement per cubic yard. Varies with mix ratio and desired strength.
What size is a cement bag?▼
Standard bag is 94 lb (1 cubic foot). Smaller 60 lb and 80 lb bags are also common. Adjust quantity accordingly.
Should I add extra for waste?▼
Yes, add 5-10% for spillage, uneven sub-base, and calculation variations.