Cement Calculator — Bags Needed for Your Concrete Mix
Calculate exact bags of pure Portland cement (94lb US / 25kg UK) plus sand and gravel required for on-site concrete mix ratios.
Project Inputs & Specs
Patios, walkways, shed floors, residential non-structural slabs, fence posts.
Visual Blueprint & Diagram
| Mix Ratio | Strength (PSI) | Recommended Applications |
|---|---|---|
| 1 | 2,500 - 3,000 PSI | Patios, walkways, shed floors, residential non-structural slabs, fence posts. |
| 1 | 3,500 - 4,000 PSI | Driveways rated for trucks, load-bearing footings, retaining walls, structural columns. |
| 1 | 1,500 - 2,000 PSI | Blinding layers, non-structural trench filling, massive unreinforced gravity footings. |
| 1 | 4,000+ PSI | Water tanks, pool copings, severe weather exposure slabs. |
Cement Bags Needed
Yields 2.00 Cu.Yds (54.0 Cu.Ft) concrete @ 1 mix
Purchase 12 Bags of Portland Cement + 1 Cu Yds Sand + 2 Cu Yds Gravel
To batch 2.00 cubic yards on-site, combine 1 bag of cement with 4.0 cu.ft sand and 16.0 cu.ft gravel per mixer load.
Concrete Mix Proportions & 1.54 Dry Bulking Chemistry
Wet volume is converted to required dry ingredients using the 1.54 consolidation multiplier, then divided into proportional ratio parts:
Dry Volume = Wet Volume × 1.54 | Cement (Cu Ft) = Dry Vol × [1 ÷ (1 + Sand_Parts + Gravel_Parts)] | Bags (94lb) = ⌈Cement Cu Ft⌉Step-by-Step Step Rule:
- 1Enter total wet concrete volume required in Cubic Yards or Cubic Feet.
- 2Select your target mix ratio (1:2:4 General Slabs, 1:1.5:3 Structural 4000 PSI, 1:3:6 Mass Concrete).
- 3Choose your packaging standard: US 94lb bags or UK 25kg metric bags.
- 4Review the complete bill of materials: cement bags, sand cubic yards, and gravel tonnage.
Frequently Asked Questions (FAQ)
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