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Concrete Calculator Formula
The volume of concrete needed is calculated using the formula:
Volume (cu yd) = (L × W × D) ÷ 27LLength (ft)
WWidth (ft)
DDepth (in)
Bag vs Ready-Mix Concrete
Bagged Concrete
- • Best for small jobs under 1 cubic yard
- • 60 lb bags cover ~0.017 cu yd each
- • 80 lb bags cover ~0.022 cu yd each
- • Requires manual mixing
- • More expensive for large projects
Ready-Mix (Truck)
- • Best for projects over 1 cubic yard
- • Typical truck holds 8-10 cubic yards
- • Delivered fresh to your site
- • Requires pump or chute for placement
- • More cost-effective for large jobs
Pro Tips for Concrete Projects
1
Add 5-10% Extra
Always order 5-10% more than calculated for waste, spillage, and uneven subgrade.
2
Check Weather
Avoid pouring in extreme heat, cold, or rain. Ideal temperature is 50-70°F (10-21°C).
3
Proper Curing
Keep concrete moist for 7 days after pouring to achieve maximum strength.
4
Use Reinforcement
Add rebar or wire mesh for structural strength in load-bearing areas.
Common Concrete Strengths
2,500 PSI
Walkways, patios
3,000 PSI
Footings, slabs
3,500 PSI
Driveways
4,000+ PSI
Structural elements