Free calculator
Slab on Grade
Calculate concrete, rebar grid, and vapor barrier quantities for a slab on grade.
Results
Enter your dimensions and hit Calculate.
Slab thickness and reinforcement depend on loading and subgrade. This is a quantity estimator — have your design reviewed by an engineer.
Assumptions
- 10% added for concrete waste.
- Rebar grid runs both directions at the specified spacing.
- 10% added for rebar lap splices.
- 15% added for vapor barrier overlap and edge turns.