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BCM to tonnes

From bank cubic metres to tonnes and loose volume.

BCM is rock measured in the ground before blasting, which is how many contractors are paid for waste. Enter the BCM and density to get tonnes, and add a swell factor to see the loose volume.

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Calculator BCM × density · BCM × (1 + swell)

Illustrative figures. Enter your own.

BCM to tonnes: questions

How do you convert BCM to tonnes?
Tonnes are BCM times the in-situ density in tonnes per BCM. Density depends on the material, so use the figure from your survey or lab tests.
What is the swell factor?
Rock takes up more room once it is broken. Loose cubic metres are BCM times one plus the swell factor, so a swell of 0.3 gives 1.3 loose cubic metres per BCM.
Why do BCM and truck counts disagree?
Trucks carry loose material, while payment is often measured in the bank by survey. Converting both ways lets the site compare the truck count with the survey.
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30 minutes • Live walkthrough • No obligation