Concrete Volume Calculator
Calculate concrete needed for a rectangular slab or pad from length, width, depth, waste percent, and bag yield.
Runs locally in your browser. This tool does not upload your input.
Slab dimensions
Results
- Area
- 12 m2
- Volume
- 1.2 m3
- Liters with waste
- 1,320 L
- Bags needed
- 66
How to estimate concrete volume
Use this calculator to estimate concrete for slabs, pads, and rectangular pours.
What this tool helps with
It multiplies length, width, and depth, then adds waste and converts the volume into liters and bag count.
Inputs to prepare
- Prepare dimensions in meters and centimeters, waste percent, and the liter yield of one bag.
- The result shows area, cubic meters, liters with waste, and bags needed.
- Always confirm structural requirements and bag yield with the product supplier or a qualified professional.
How to use it well
- Start with the sample values, then replace them with your own numbers or text.
- Check the result and adjust assumptions before relying on it.
- Use it as a planning aid, then confirm important outputs in the source system or real-world context.
Privacy
This tool runs locally in your browser. The values you type are used only to update the result on the page.
FAQ
Why enter depth in centimeters?
Many small slab depths are easier to measure in centimeters while length and width are usually in meters.
Why are bags rounded up?
You cannot buy a fraction of a bag, so the tool rounds up to the next whole bag.
Does this replace engineering advice?
No. It is a volume estimate, not a structural design tool.