When to use this calculator
- Estimate patio or sidewalk concrete
- Plan small slabs or pads
- Compare bag counts
- Add a buffer for forms and waste
Tips for a better estimate
- Confirm slab thickness before ordering.
- Check bag yield on the product label.
- Consider base prep, reinforcement, drainage, and local requirements.
- Order enough to account for forms, spillage, and uneven subgrade.
HomeCalc gives planning estimates only. Product labels, package sizes, coverage rates, supplier conversions, local code, and site conditions can change the final quantity you need.
Frequently asked questions
What thickness should I use?
Thickness depends on the project, load, base, and local requirements. Verify before ordering.
Are bag counts exact?
No. Bag yield varies by product. Check the label and round up when appropriate.
Does this replace building advice?
No. It is a planning calculator, not engineering or code advice.