Concrete Slab Cost Calculator
Estimate a concrete slab project budget from dimensions, thickness, waste, concrete price, reinforcement, preparation, labor and delivery charges.
Default project preview
$5,699.00
Concrete order
6.4 yd³
Concrete cost
$1,056.00
Reinforcement
$648.00
Base preparation
$1,080.00
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.
Slab length
Enter this project assumption in ft. The current imperial default is 24 ft.
Slab width
Enter this project assumption in ft. The current imperial default is 20 ft.
Slab thickness
Enter this project assumption in in. The current imperial default is 4 in.
Concrete allowance
Enter this project assumption in %. The current imperial default is 8 %. Minimum: 0. Maximum: 30.
Concrete price
Enter this project assumption in per yd³. The current imperial default is 165 per yd³. Minimum: 0.
Reinforcement allowance
Enter this project assumption in per ft². The current imperial default is 1.35 per ft². Minimum: 0.
Placement and finishing labor
Enter this project assumption in per ft². The current imperial default is 5.5 per ft². Minimum: 0.
Base preparation allowance
Enter this project assumption in per ft². The current imperial default is 2.25 per ft². Minimum: 0.
Delivery and short-load fees
Enter this project assumption in fixed. The current imperial default is 275 fixed. Minimum: 0.
How to read the outputs
Concrete order
8% allowance. Default preview: 6.4 yd³.
Concrete cost
order volume × entered rate. Default preview: $1,056.00.
Reinforcement
area-based allowance. Default preview: $648.00.
Base preparation
area-based allowance. Default preview: $1,080.00.
Labor
placement and finishing. Default preview: $2,640.00.
Cost per area
per ft². Default preview: $11.87.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Area = length × width. Concrete volume = area × thickness. Order volume adds the entered allowance. Total cost adds concrete, reinforcement, preparation, labor and delivery.
Reviewed project guidance
How to use this estimate in a real project
Last reviewed: July 30, 2026
Build a transparent concrete-slab budget from area, thickness, material volume, concrete price, reinforcement, base, forms, labor and equipment. It is a planning estimate rather than a contractor quotation.
Calculation steps
- 1Calculate slab volume from confirmed area and thickness.
- 2Apply the selected placement allowance and supplier rounding.
- 3Add base, reinforcement, forms, joints, finishing and curing as separate lines.
- 4Include delivery minimums, pump or access costs, tax and contingency.
Worked numerical example
A 900 ft² slab at 4 in thick requires 11.11 yd³ geometrically. With 8% allowance and concrete at ₪520 per yd³, concrete alone is about ₪6,240 before delivery, pumping, reinforcement, base and labor.
Purchasing and rounding
Request quotes using the same scope and units. Separate fixed mobilization costs from unit rates so small-project premiums and supplier minimums remain visible.
Interpret the result
Cost per square foot or metre is meaningful only when scope is consistent. A low material-only number should not be compared with a complete installed bid.
Page-specific assumptions
- Dimensions and thickness are confirmed.
- Currency and tax treatment are consistent.
- Unit prices reflect the project location and date.
Common mistakes
- Comparing material cost with installed contractor pricing.
- Ignoring short-load or pump minimums.
- Omitting subbase, reinforcement and curing.
- Using one contingency to hide missing scope.
Primary and technical references
BuildMeter provides planning estimates, not engineering, architectural, electrical, mechanical, plumbing, permit or code approval. Review the methodology and verify final decisions with product documentation and qualified professionals.
Related tools
Continue planning the project
BuildMeter Guides
Understand the measurements and assumptions
Use these visible reference guides before changing project inputs or planning allowances.
FAQ
Concrete Slab Cost Calculator questions
Does this include excavation?+
Only through the entered preparation rate. Major excavation, hauling or unsuitable soil should be estimated separately.
Why add a concrete allowance?+
Subgrade variation, form tolerances, spillage and supplier batching can make the theoretical volume insufficient.
Does the calculator design reinforcement?+
No. It provides only an editable cost allowance; reinforcement type and spacing require project-specific design.