Foundation Calculator
Plan and estimate your concrete foundation requirements. Compute concrete volume, reinforcing rebar length, compacted gravel bases, machinery excavation, ready-mix truckloads, and complete labor and material cost budgets.
Foundation Project Presets
Shed Foundation
10' × 12' × 4" • Slab • Compacted Gravel Base
Garage Slab
24' × 24' × 4" • Thickened Edge perimeter footing
House Foundation
40' × 60' × 6" • Slab + Trench Footings & Piers
Workshop Foundation
30' × 40' × 6" • Heavy Duty Slab & Formwork
Results Summary
View Calculation Breakdown
How this was calculated:
Everything behind the Foundation Calculator
Formulas, reference charts, and detailed answers — expand any section you need.
Foundation Concrete Table
| Foundation Size | Approx Concrete |
|---|---|
| 10×12×4" | 1.5 Yards |
| 24×24×4" | 7 Yards |
| 30×40×6" | 22 Yards |
| 40×60×6" | 45 Yards |
Rebar Spacing Table
| Application | Typical Spacing |
|---|---|
| Residential Slab | 18"-24" |
| Garage Slab | 12"-18" |
| Heavy Duty Slab | 12" |
| Commercial Slab | Engineer Design |
Gravel Coverage Table
| Gravel Depth | Coverage Per Ton |
|---|---|
| 2 Inches | Approx 100 sq ft |
| 4 Inches | Approx 50 sq ft |
| 6 Inches | Approx 33 sq ft |
How Much Concrete Do I Need for a Foundation?
One of the most common questions before pouring concrete is how much concrete is needed for a foundation.
The answer depends on:
- Foundation Size
- Foundation Thickness
- Footing Dimensions
- Project Type
This foundation calculator estimates concrete volume instantly.
Concrete Slab Foundation Calculator
A concrete slab foundation is one of the most common residential foundation systems.
The slab foundation calculator estimates:
- Concrete Volume
- Rebar
- Gravel Base
- Material Costs
for garages, sheds, patios, and homes.
House Foundation Calculator
Building a new home requires accurate foundation planning.
The house foundation calculator estimates:
- Foundation Concrete
- Footings
- Rebar
- Gravel Base
- Excavation
for residential construction projects.
Footing Calculator: Estimate Foundation Footings
Footings distribute building loads into the soil.
The footing calculator estimates:
- Concrete Required
- Footing Volume
- Excavation Requirements
for residential and commercial projects.
Foundation Rebar Calculator
Reinforcement is critical for concrete strength.
The foundation rebar calculator estimates:
- Rebar Length
- Grid Spacing
- Rebar Quantity
based on slab dimensions.
Gravel Base Calculator for Foundations
Most foundations require a compacted gravel base beneath the slab.
The gravel base calculator estimates:
- Gravel Volume
- Tons of Gravel
- Material Costs
for proper foundation preparation.
Foundation Excavation Calculator
Before pouring concrete, excavation is required.
The foundation excavation calculator estimates:
- Soil Removal
- Excavation Volume
- Truckloads
- Disposal Costs
for foundation preparation.
Foundation Cost Calculator
Foundation costs depend on:
- Concrete Prices
- Excavation Costs
- Rebar Requirements
- Labor Rates
- Site Conditions
The foundation cost calculator estimates total project expenses before construction begins.
Concrete Truck Calculator
Ready-mix concrete is delivered by truck.
The concrete truck calculator estimates:
- Number of Truckloads
- Concrete Weight
- Delivery Requirements
for large foundation pours.
Common Foundation Examples
Shed Foundation
10 ft × 12 ft × 4 in
Garage Slab
24 ft × 24 ft × 4 in
House Foundation
40 ft × 60 ft × 6 in
Workshop Foundation
30 ft × 40 ft × 6 in