Cost per Tonne Calculator
Cost per tonne is the fundamental mining and earthmoving unit rate: total cost divided by tonnes produced.
Enter Values
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the total cost for the period or job (use one consistent cost scope — e.g. load + haul only, or full mine-to-mill).
- Enter the tonnes produced or moved over that same period.
- Optionally enter the bank cubic metres (BCM) moved to also get a cost per BCM.
- Read the cost per tonne (and per BCM); open the working to see the exact division.
How it works
Cost per tonne is the fundamental mining and earthmoving unit rate: total cost divided by tonnes produced. Cost per tonne = total cost ÷ tonnes. The optional cost per BCM = total cost ÷ bank cubic metres moved, used where production is measured by volume rather than mass. Both are simple ratios, so the answer is only as meaningful as the boundary you draw around the cost and the tonnes — they must cover the same activity and period.
Because the calculation is a division, the tonnes (or BCM) denominator must be greater than zero, otherwise the rate is undefined and the tool returns an error rather than infinity. A lower cost per tonne generally signals better efficiency, but only when comparing like scopes: a load-and-haul rate cannot be compared with a full mine-to-mill rate. Always confirm which costs (labour, fuel, maintenance, overhead) and which tonnes (survey, weighbridge, truck-count) are included before drawing conclusions.
Worked example
Load-and-haul cost per tonne. A quarry moved 250,000 t of material for a total operating cost of $850,000 over the month. Cost per tonne = 850,000 ÷ 250,000 = $3.40 /t. If those tonnes came from 100,000 BCM, the cost per BCM = 850,000 ÷ 100,000 = $8.50 /BCM. The unit rate lets you compare shifts, fleets or contractors on a like-for-like basis.
Common mistakes
- Mixing cost scopes — putting the full operating cost over only the load-and-haul tonnes (or vice versa). The cost and the tonnes must cover exactly the same activity and period.
- Confusing tonnes with BCM. Tonnes are a mass and BCM a bank volume; you convert between them with material density, so a cost per tonne and a cost per BCM are not interchangeable.
- Using inconsistent tonnage sources — comparing a survey-tonnes rate against a weighbridge-tonnes or truck-count rate, which can differ by several percent and distort the comparison.
Frequently asked questions
What is a cost per tonne in mining?
It is the total cost of moving or producing material divided by the tonnes produced — the standard unit rate used to compare shifts, fleets, contractors and budgets. A $850,000 cost over 250,000 t is $3.40 per tonne.
What is the difference between cost per tonne and cost per BCM?
Cost per tonne divides cost by mass (tonnes); cost per BCM divides the same cost by the bank (in-situ) volume moved in cubic metres. You convert between tonnes and BCM using the material's in-situ density, so the two rates differ and are not interchangeable.
Why do I get an error when tonnes is zero?
Cost per tonne is total cost divided by tonnes, and dividing by zero is undefined. Enter a tonnage greater than zero. The optional BCM field must also be greater than zero if you fill it.
Does this tool store or send my cost data?
No. It runs entirely in your browser as pure arithmetic — nothing is uploaded, saved or sent anywhere.
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