Concrete Pad Calculator
Estimate concrete volume, full bags, surface area, perimeter, placed weight and cost for one or more rectangular equipment or utility pads.
Default project preview
1.96 yd³
Concrete bags
88
Base volume
1.78 yd³
Pad surface area
144 ft²
Form perimeter
48 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Pad length
Enter this project assumption in ft. The current imperial default is 12 ft.
Pad width
Enter this project assumption in ft. The current imperial default is 12 ft.
Pad thickness
Enter this project assumption in in. The current imperial default is 4 in.
Equal pads
Enter this project assumption in a unitless value. The current imperial default is 1. Minimum: 1.
Extra allowance
Enter this project assumption in %. The current imperial default is 10 %. Minimum: 0. Maximum: 50.
Concrete yield per bag
Enter this project assumption in ft³. The current imperial default is 0.6 ft³.
Ready-mix price
Enter this project assumption in per yd³. The current imperial default is 165 per yd³. Minimum: 0.
Price per bag
Enter this project assumption in a unitless value. The current imperial default is 7. Minimum: 0.
How to read the outputs
Concrete bags
rounded full bags. Default preview: 88.
Base volume
before allowance. Default preview: 1.78 yd³.
Pad surface area
all pads. Default preview: 144 ft².
Form perimeter
outer edges. Default preview: 48 ft.
Placed weight
planning density. Default preview: 7,911 lb.
Cost comparison
ready-mix / bags. Default preview: $322.67 / $616.00.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Volume = pad length × width × thickness × quantity. The allowance is applied before converting to ready-mix volume and rounding bag quantity up.
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Concrete Pad Calculator questions
Should compacted gravel be included in the thickness?+
No. Enter only the concrete thickness and estimate the granular base separately.
Can this size an equipment foundation?+
No. Equipment loads, vibration, anchors and soil conditions require an engineered foundation design.
Why are bags rounded up?+
Concrete is purchased in full bags, so a partial calculated bag becomes one complete bag.