Concrete Volume Calculator
Calculate the volume of concrete needed for slabs, footings, columns, and other structures
Results
Step-by-Step Calculation
Understanding Concrete Volume
Concrete is sold and measured by volume, typically in cubic yards (yd³) in the US or cubic meters (m³) in metric countries. Accurately calculating the volume you need prevents waste and ensures you have enough material to complete your project. Ready-mix concrete trucks typically deliver in increments of 0.25 cubic yards.
Basic Volume Formulas:
- Rectangular Slab: Volume = Length × Width × Thickness
- Round Column: Volume = π × (Diameter/2)² × Height
- Square Column: Volume = Side² × Height
Key Conversions:
- 1 cubic yard = 27 cubic feet = 46,656 cubic inches
- 1 cubic meter = 35.31 cubic feet = 1.308 cubic yards
- 1 cubic yard = 0.7646 cubic meters
- 1 cubic yard of concrete ≈ 4,050 lbs (1,837 kg)
Recommended Concrete Thicknesses
| Application | Thickness (inches) | Thickness (cm) | Typical Strength (psi) |
|---|---|---|---|
| Sidewalk / Patio | 4" | 10 cm | 3,000 |
| Driveway (residential) | 4" - 6" | 10 - 15 cm | 3,500 - 4,000 |
| Garage Floor | 4" - 6" | 10 - 15 cm | 3,500 |
| Foundation Wall | 8" - 12" | 20 - 30 cm | 3,500 - 4,000 |
| Strip Footing | 8" - 12" | 20 - 30 cm | 3,000 - 3,500 |
| Heavy Equipment Pad | 6" - 8" | 15 - 20 cm | 4,000+ |
Important: Always check local building codes for minimum concrete thickness and strength requirements. Requirements may vary by region and intended use.
Concrete Mix Types
Ready-Mix Concrete
Delivered by truck, ideal for large projects (1+ cubic yards):
- • Consistent quality and strength
- • Available in various strength grades
- • Minimum order typically 1 cubic yard
- • Short delivery fee may apply for small orders
Bagged Concrete Mix
Pre-mixed bags for small to medium projects:
- • 40 lb bag ≈ 0.011 yd³ (0.30 ft³)
- • 60 lb bag ≈ 0.017 yd³ (0.45 ft³)
- • 80 lb bag ≈ 0.022 yd³ (0.60 ft³)
- • Best for projects under 0.5 cubic yards
High-Strength Mix
For structural applications requiring extra strength:
- • 4,000 - 5,000+ psi rated
- • Foundations and structural columns
- • Heavy traffic areas
- • Contains more cement per cubic yard
Fast-Setting Mix
Quick curing for time-sensitive projects:
- • Sets in 20-40 minutes
- • Fence posts and mailbox posts
- • Small repairs and patches
- • No mixing required for post setting
Tips for a Successful Concrete Pour
1. Order Extra
Always order 5-10% more concrete than calculated. Ground irregularities, form bulging, and spillage can increase the actual volume needed. Running short during a pour is far worse than having a little extra.
2. Proper Preparation
- • Compact and level the sub-grade before pouring
- • Add a gravel base (4-6 inches) for drainage
- • Use proper forms and stakes to contain the concrete
- • Install reinforcement (rebar or wire mesh) as needed
3. Weather Considerations
- • Ideal temperature: 50°F to 85°F (10°C to 30°C)
- • Avoid pouring in extreme heat, cold, or rain
- • Cold weather slows curing; use blankets or heated enclosures
- • Hot weather accelerates drying; keep surface moist
4. Curing
Concrete reaches about 70% of its full strength after 7 days and 100% after 28 days. Keep the surface moist for at least 7 days by spraying with water or covering with plastic sheeting. Proper curing is essential for achieving maximum strength and durability.
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Note: This calculator provides estimates based on standard formulas and typical conditions. Actual concrete requirements may vary due to ground conditions, form irregularities, waste, and specific project requirements. For large or structural projects, consult with a professional contractor or engineer. Always verify volumes with your concrete supplier before ordering.
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