Cement is the binding agent in concrete and mortar. This calculator helps you determine how much Portland cement you need based on your project volume and desired mix ratio.
Common mix ratios include 1:4 for strong concrete (1 part cement to 4 parts aggregate) and 1:6 for lighter applications. The ratio affects strength, workability, and cost. Stronger mixes use more cement but create more durable results.
Portland cement typically comes in 94-pound bags in the US. Each bag contains approximately 1 cubic foot of cement. For large projects, cement may be available in bulk, which is more economical but requires proper storage to prevent moisture damage.
Always store cement bags off the ground on pallets and cover them with plastic. Cement absorbs moisture from the air and will harden if not properly protected. Once a bag becomes hard or lumpy, it should not be used as it won't develop proper strength.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
Cement is the powder that binds concrete. Concrete is the mixture of cement, sand, gravel, and water.
A 1:4 ratio means 1 part cement to 4 parts aggregate (sand and gravel combined).
Unopened bags last 6 months if stored properly. Once opened, use within 3 months.
Old cement loses strength. If it's lumpy or hard, discard it. Fresh cement should be fine powder.
Portland cement is the most common type, made from limestone and clay, ideal for most construction projects.