Concrete Slab Thickness Calculator
Estimate the slab thickness needed for a design point load.
Work It Out And Get Clear Answers
Estimate the slab thickness needed for a design point load.
Concrete Slab Thickness Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Press Calculate to see the result.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Concrete Slab Thickness Quick Guide
Typical values for reference.
| Design point load (kN) | Concrete strength fc (MPa) | Safety factor | Required thickness |
|---|---|---|---|
| 30 | 25 | 2 | 139.1 mm |
| 15 | 25 | 2 | 98.37 mm |
| 60 | 25 | 2 | 196.7 mm |
| 30 | 12.5 | 2 | 165.4 mm |
| 30 | 50 | 2 | 117 mm |
| Rule of thumb: check your inputs, use the result as a guide and round sensibly. | |||
Concrete Slab Thickness FAQ
Answers to common questions about this calculator.
Inverts P ≈ (fr ÷ SF) × h² with fr = 0.62√fc. Planning guide only; confirm with an engineer.
It uses the default inputs shown and the formula described above. Change any value and press Calculate to see how the result moves.
It is an estimate based on the inputs you enter. Check real quotes, labels, product data or official guidance for important decisions.
Yes. Replace each input with your own figures and press Calculate to update the result.