Build a reliable footprint from everyday operational data. Compare scopes, sources, and reduction opportunities fast. Export clean tables and totals for ESG disclosure workflows.
| Scope | Activity | Value | Unit | EF | Emissions (tCO₂e) |
|---|---|---|---|---|---|
| 1 | Natural Gas | 12,000 | m³ | 1.90 | 22.8000 |
| 1 | Diesel (fleet) | 3,000 | L | 2.68 | 8.0400 |
| 1 | Refrigerant R-410A leakage | 5 | kg | 2,088 | 10.4400 |
| 2 | Purchased electricity | 150,000 | kWh | 0.55 | 82.5000 |
| 3 | Air travel | 30,000 | km | 0.15 | 4.5000 |
| 3 | Mixed waste to landfill | 40 | tonnes | 500 | 20.0000 |
| Total | 148.2800 | ||||
Start by defining organizational boundaries and reporting year. Most inventories use operational control, then map every activity into Scopes 1–3. A clear boundary note reduces double counting and supports assurance. Track sites, fleets, leased assets, and purchased energy consistently across periods.
Prioritize primary data: meter readings, fuel invoices, refrigerant top‑ups, and travel logs. For electricity, capture total kWh and document the accounting method. Gaps can be filled with estimates, but flag them and improve next cycle. Keep units consistent to avoid hidden conversion errors. Monthly data supports trend checks and faster detection of meter issues.
Emissions are calculated as activity multiplied by an emission factor, producing kgCO₂e. This calculator lets you keep a default factor as a placeholder and overwrite it with approved factors. Refrigerants use leaked mass multiplied by a 100‑year global warming potential, which can dominate Scope 1 in cooling‑intense operations. Align grid factors to the same year and geography, and document renewable instruments separately when applicable.
Use the scope totals to identify where reductions matter. If Scope 2 is largest, focus on grid intensity, efficiency, and procurement. If Scope 3 drives the footprint, examine travel, commuting, waste routes, water services, and purchasing categories. The line‑item table helps isolate high‑impact sources rapidly. Rank sources by tonnes and controllability so projects target both materiality and feasibility.
Intensity indicators translate totals into business terms. tCO₂e per employee highlights operational practices, while tCO₂e per million revenue supports benchmarking between business units. Interpret intensities alongside structural changes such as acquisitions, outsourcing, or shifts in product mix, not as standalone performance scores. Pair intensity targets with activity drivers, for example kWh per square meter or liters per vehicle‑kilometer, to guide operational owners.
Export CSV for audit trails and reuse the same structure each period. Maintain documentation for factors, assumptions, and data sources. Perform reasonableness checks, such as comparing kWh per square meter or fuel per vehicle. Over time, move from spend‑based estimates toward activity‑based measurements to improve accuracy. Keep a change log for factor updates, run variance explanations, and lock calculation versions before external reporting.
1) What emissions are included in this calculator?
It estimates CO₂e for common Scope 1 fuels and refrigerants, Scope 2 electricity and purchased heat, and selected Scope 3 categories like travel, commuting, waste, water, and spend-based purchasing.
2) Can I use my own emission factors?
Yes. Leave factor fields empty to use defaults, or enter your approved factors directly. Keep the factor unit aligned with the activity unit shown beside each input.
3) What is the difference between location-based and market-based electricity?
Location-based reflects average grid emissions for the region. Market-based reflects contractual instruments like renewable certificates or supplier-specific factors, when your reporting program allows them.
4) Why do refrigerants sometimes dominate Scope 1?
Many refrigerants have high GWP values. Even small leakage masses can produce large CO₂e totals, so maintenance, leak detection, and alternative refrigerants can be highly effective.
5) How should I handle missing data?
Use best-available estimates, document assumptions, and mark them for improvement. Replace estimates with primary data next cycle to strengthen accuracy and support third-party assurance.
6) Is the spend-based Scope 3 method reliable?
It is useful for screening and early inventories, but it is less precise. Shift high-impact categories to activity-based data where possible for better decision-making.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.