Calculator inputs
Use the grid below for large, medium, and mobile screens. Results appear above this form after submission.
Formula used
1. Electricity in kWh = activity value × electricity unit multiplier.
2. Factor in kg CO2e/kWh = entered factor × factor unit multiplier.
3. Combustion emissions = electricity kWh × factor kg/kWh × combustion share.
4. Grid loss emissions = combustion emissions × grid loss percentage.
5. Upstream emissions = electricity kWh × upstream add-on factor.
6. Total emissions = combustion emissions + grid loss emissions + upstream emissions.
7. Effective factor = total emissions ÷ electricity kWh.
8. Carbon cost = total emissions in tonnes × carbon price.
How to use this calculator
- Enter your electricity use and choose the matching unit.
- Add the emission factor you want to apply.
- Select the factor unit for accurate normalization.
- Set a combustion share for the scenario.
- Apply grid loss uplift if your method requires it.
- Enter an upstream factor when you need a broader estimate.
- Choose the output unit you want to report.
- Add a carbon price for cost planning.
- Press the calculate button to view the result above the form.
- Download the result as CSV or PDF after calculation.
Example data table
| Scenario | Electricity | Factor | Combustion Share | Grid Loss | Upstream Factor | Total Emissions | Carbon Cost |
|---|---|---|---|---|---|---|---|
| Example A | 12,500 kWh | 0.23 kg CO2e/kWh | 72% | 6% | 0.015 kg CO2e/kWh | 2.3817 t CO2e | €202.44 |
| Example B | 8.20 MWh | 250 g CO2e/kWh | 60% | 4% | 0.010 kg CO2e/kWh | 1.3612 t CO2e | €115.70 |
| Example C | 0.015 GWh | 0.19 kg CO2e/kWh | 85% | 8% | 0.012 kg CO2e/kWh | 2.7969 t CO2e | €237.74 |
Frequently asked questions
1. What does this calculator estimate?
It estimates CO2e from purchased electricity using a user-entered factor, combustion share, grid loss uplift, and an optional upstream add-on. It supports scenario analysis and reporting preparation.
2. Why does combustion share matter?
Combustion share lets you scale the factor to the portion of electricity linked to combustion-based generation in your chosen scenario. It is useful when you model partial fossil intensity.
3. What does grid loss uplift do?
Grid loss uplift adds a percentage on top of combustion emissions. It helps model extra emissions associated with distribution and transmission losses when your reporting method includes them.
4. What is the upstream add-on factor?
The upstream add-on factor is an extra kg CO2e per kWh. It allows a broader estimate when your method includes upstream energy-chain effects.
5. Which factor unit should I choose?
Choose the unit that matches your source data. The calculator normalizes each option into kg CO2e per kWh before it calculates emissions.
6. Does this replace formal assurance work?
No. This page is a practical planning tool. Final disclosures should follow your reporting framework, internal controls, and approved factor sources.
7. Why show both kg and tonnes?
Both views help different audiences. Operational teams often prefer kilograms, while ESG reports and carbon pricing discussions usually use tonnes.
8. What does the carbon cost estimate mean?
It multiplies total tonnes by the carbon price you enter. This gives a simple planning estimate for internal shadow pricing or budget sensitivity checks.