How to use this calculator
- Enter annual emissions within a consistent boundary.
- Enter the internal carbon price approved for planning.
- Add a reduction scenario and annual revenue for context.
- Compare the current charge with the reduced case.
#2942 · Energy & Environment Tool
Internal Carbon Price Carbon Cost Calculator
Translate an emissions inventory into an annual internal carbon charge, then compare that charge with a reduction case. This calculator helps budgeting teams allocate a shadow price or internal fee without implying that the result is a tax, market price, or regulatory obligation.
Calculator
Carbon charge assumptionsFormula
Current charge = Emissions × internal price
Avoided charge = Current charge × reduction %
Avoided charge = Current charge × reduction %
What the result means
The main result is the annual internal carbon charge before the modeled reduction. Avoided charge shows the financial signal attached to reducing emissions.
An internal carbon price is a management assumption. Do not present it as a statutory carbon tax or external market quote.
Example calculation
At 25,000 tCO2e and $75 per tonne, the annual internal charge is $1,875,000. A 15% reduction avoids $281,250 and leaves a $1,593,750 charge.
Tips for better results
- Use one inventory boundary across departments.
- Document whether the price is a fee or shadow price.
- Review the price on a set cadence.
- Avoid double counting reductions.
- Compare projects using the same price.
Frequently asked questions
Does the carbon cost result represent an actual tax?
No. It is a planning value based on the internal carbon price you enter, not a forecast of any specific tax or regulatory charge.
Should I enter tonnes of CO2 or CO2e?
Use metric tonnes of carbon dioxide equivalent (tCO2e) consistently across all emissions fields.
What happens if I enter zero?
Zero is accepted where it is meaningful. The calculator blocks negative values and any input that would make the selected scenario invalid.
How should uncertain inputs be handled?
Run conservative, central, and optimistic cases by changing the uncertain inputs and compare the resulting exposure.
Can this result be used for regulatory reporting?
It is a planning estimate only. Apply the required reporting standard, boundaries, factors, and assurance process separately.
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Internal charge variables
| Variable | Unit | Use |
|---|---|---|
| Emissions | tCO2e | Annual inventory in scope |
| Internal price | $/tCO2e | Management planning assumption |
| Reduction | % | Scenario decline in emissions |
| Revenue | $ | Context for cost intensity |