Concrete Depot
Concrete Calculators & Tools
Dashboard-ready report tool

Concrete Slab Weight Calculator

Estimate the weight of a concrete slab from length, width, thickness, and concrete density. The tool also builds a branded report with a live 3D measurement diagram.

Measurement inputs

Live calculation

Updates live
Used only in the saved report.
Switches and converts the starter units.
Use 0 for an existing slab. Use 5–10 for handling allowance. Enter an allowance of 0 or more.
Enter a length greater than 0.
Enter a width greater than 0.
Enter a thickness greater than 0.
Normal concrete is often near 150 lb/ft³ or 2400 kg/m³. Enter a density greater than 0.
Optional. Use for dump trailer or truck load count. Capacity cannot be negative.

Live 3D slab preview

Shape uses the current measurements.

Length 20 ft
Width 12 ft
Thickness 4 in
Estimated slab weight
—
Enter valid measurements to calculate.
Base weight
—
Before allowance
Concrete volume
—
Volume breakdown
Surface area
—
Top slab area
Weight per area
—
Based on thickness
Load count
—
Optional capacity
Density used
—
Concrete weight per volume

Formula used

These same steps are saved in the report.

Concrete slab weight
Weight = Length × Width × Thickness × Density

All measurements are converted to feet for US results and meters for metric results before the final weight is shown.

  1. Enter valid measurements to see the calculation steps.

This calculator gives an estimate. Concrete density can change with mix design, aggregate, moisture, and reinforcement. Confirm final loads with your contractor, engineer, or disposal provider.