Cement Calculator
Calculate cement bags needed for concrete mixing with accurate mix ratios. Professional tool trusted by contractors for optimal concrete strength and cost estimation.
Calculate Cement Needed
4 inches = 0.33 feet
Best for: General construction, slabs
Average $6.50 for 94lb portland cement bag
Cement Mixing Guide
1:1.5:3
High Strength (M25)
Foundations, columns, beams
1:2:3
Medium Strength (M20)
General construction, slabs
1:2:4
Standard (M15)
Floors, driveways, sidewalks
1:3:6
Low Strength (M10)
Non-structural, filling
Frequently Asked Questions
How many bags of cement do I need per cubic yard?
Typically 6-7 bags of 94-pound Portland cement per cubic yard for standard concrete mix (1:2:3 ratio). Higher strength mixes require more cement.
What's the difference between cement mix ratios?
1:1.5:3 provides highest strength for foundations, 1:2:3 is standard for general construction, 1:2:4 is economical for floors, and 1:3:6 is for non-structural applications.
How much water should I add to cement?
Water-cement ratio should be 0.4-0.6 by weight. Too much water weakens concrete, too little makes it hard to work with. Start with less and add gradually.
Can I use this calculator for ready-mix concrete?
This calculator is for mixing your own concrete from cement, sand, and gravel. For ready-mix, you'll typically need 1 cubic yard of concrete per 81 square feet at 4-inch thickness.