Concrete Slab Footing Calculator

Measurement inputs

Live calculation

Project name This name appears in the report.

Unit system

Footing layout

Slab length

Enter a slab length greater than 0.

Slab width

Enter a slab width greater than 0.

Slab thickness

Enter a slab thickness greater than 0.

Custom footing length

Enter a custom footing length greater than 0.

Footing width

Width of the thickened footing strip. Enter a footing width greater than 0.

Footing extra depth

Extra depth below the main slab thickness. Enter a footing depth greater than 0.

Gravel base depth

Enter 0 or a positive gravel depth.

Waste / overage (%)

Waste cannot be negative.

Bag estimate based on

Concrete cost

Optional. Leave blank if cost is not needed. Cost cannot be negative.

Live 3D slab footing preview

Same SVG is used in report

Slab size—

Footing—

Footing length—

Concrete results

Includes waste

Order quantity with waste

Base concrete plus selected waste percentage.

—

Slab concrete—

Footing concrete—

Total base volume—

Concrete with waste—

Cubic feet—

Cubic meters—

40 lb bags—

60 lb bags—

80 lb bags—

Estimated cost—

Slab area—

Gravel base—

Formula used

Total volume = Slab volume + Footing volume

All dimensions are converted to feet before concrete volume is calculated.

Calculation steps

Enter valid measurements to see the steps.