Calculate concrete volume, weight, bags needed, and total cost for your construction project.
Results:
Volume: 0.93 cubic yards | 25.0 cubic feet
Bags Needed: 21 bags (60 lb)
Weight: 1,260 lbs | 0.63 tons
Total Cost: $94.50
Concrete Volume & Mix Optimization Engine
Essential Formula
Volume (ft³) = L × W × (T / 12) → Cubic Yards = ft³ ÷ 27 → Add Waste (5–12%).
Bag Translation
- 40 lb ≈ 0.011 yd³ • 60 lb ≈ 0.017 yd³ • 80 lb ≈ 0.022 yd³
- Bags Needed = (Required Yards ÷ BagYield) rounded up
Strength & Mix Notes
- Driveway / Slab: 3000–3500 psi (air entrainment cold climates)
- Footings / Structural: 3500–4000 psi with rebar grid
- Interior Flatwork: 3000 psi standard finish
Cost Drivers
- Short‑load fees (partial truck surcharge)
- Admixtures: Accelerator, plasticizer, fiber reinforcement
- Pump access vs direct chute placement
Placement Checklist
- Compacted sub‑base (4–6" granular)
- Reinforcement: Wire mesh or #3/#4 rebar grid @ 18" or design
- Control joints: 24–30× slab thickness (inches)
- Initial cure: Keep moist first 48 hrs; full cure @ 28 days
Waste Calibration
- Simple rectangle: 5%
- Irregular edges / steps: 8–10%
- Heavy edge thickening: 10–12%
Rapid QA Signals
- Segregation / bleed water pooling → mix too wet
- Early shrink cracking (12–24h) → insufficient curing / rapid evaporation
- Honeycombing edges → poor consolidation / vibration lapse
Quick FAQ
- Rebar or mesh? Rebar for load + crack control, mesh mainly for shrink micro‑crack distribution.
- Add extra water onsite? Minimal only; alters w/c ratio and strength.
- Pump vs wheelbarrow? Pump for >10 yd³ or limited access (labor & finish quality).
Tip: Lock dimensions & thickness before ordering; 0.5" thickness creep across large slabs materially shifts yardage.