Concrete Calculator
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Shape
Slab / Footing
L x W x Depth
Column / Cylinder
Diameter x Height
Wall
L x H x Thickness
Length (feet)
Width (feet)
Depth (inches)
Waste Factor (%)
5%
10%
15%
Ready-Mix Price ($/cubic yard)
Common Project Presets
Sidewalk (4ft x 20ft)
Standard 4" thick sidewalk
Patio (12ft x 12ft)
Standard backyard patio
Driveway (10ft x 20ft)
Two-car driveway section
Foundation (24ft x 36ft)
Garage or small building
Fence Post (8" x 24")
Standard fence post footing
Column (12" x 48")
Structural column or pier
Retaining Wall (20ft x 4ft)
Garden retaining wall
Cubic Yards
2.47
Cubic Feet
66.67
80lb Bags
112
60lb Bags
149
Copy
With 10% Waste Factor
Cubic Yards
2.72
+0.25 extra
80lb Bags
123
+11 extra
60lb Bags
163
+14 extra
Ready-Mix vs Bag Comparison
Ready-Mix Truck
$407
2.72 yd3 x $150/yd3
Best value
Best for 1+ cubic yards
80lb Bags
$728
112 bags x $6.50/bag
0.60 cu ft each
60lb Bags
$820
149 bags x $5.50/bag
0.45 cu ft each
Tip:
For projects over 1 cubic yard, ready-mix delivery is usually more economical and provides better consistency. For small projects under 0.5 cubic yards, bags are more practical.
Volume Conversions
Cubic Feet
66.67
Cubic Yards
2.47
Cubic Meters
1.89
Liters
1,888
Weight (approx)
10,000 lbs
Weight (metric)
4,536 kg
Recommended Concrete Thickness
Project
Thickness
PSI Rating
Sidewalk / Path
4"
3,000
Patio / Floor Slab
4"
3,500
Driveway (cars)
4-6"
4,000
Driveway (heavy vehicles)
6-8"
4,500
Foundation / Footing
6-12"
4,000+
Retaining Wall
6-8"
4,000