Measure organizational emissions with clear scope breakdowns. Adjust factors to match your region. Turn activity data into carbon insights, faster and simpler.
Use scope-aligned activity inputs to estimate total CO₂e. Replace placeholder factors with your preferred dataset and methodology.
This sample shows how activity and factors translate into emissions. Replace with your organization’s measured data and chosen factors.
| Scope | Source | Activity | Unit | Example factor | Example emissions (kg CO₂e) |
|---|---|---|---|---|---|
| Scope 1 | Natural gas combustion | 25,000 | kWh | 0.184 | 4,600.00 |
| Scope 2 | Purchased electricity | 180,000 | kWh | 0.500 | 90,000.00 |
| Scope 3 | Air travel distance | 25,000 | km | 0.115 | 2,875.00 |
The calculator applies a simple emissions model for each line item: Emissions (kg CO₂e) = Activity Data × Emission Factor.
Tip: Keep factors, boundaries, and period consistent for year-to-year comparison.
Download buttons appear after calculation for reporting and sharing.
Start by defining what the inventory covers: operational control, financial control, or equity share. Inconsistent boundaries are the main reason year‑over‑year totals drift. This calculator is designed for one reporting period, so lock the boundary first, then collect activity data from meters, invoices, travel logs, fleet cards, and procurement systems. For quality control, record sources, data owners, and timestamps, and apply simple checks such as month‑to‑month variance and unit consistency.
Scope 1 typically combines combustion and leakage. Fuel data is best recorded in original units and validated against purchase totals and vehicle odometer readings. Refrigerant leakage can outweigh fuel in small offices when high‑GWP gases are used; track top‑ups, maintenance events, and end‑of‑life recovery. If you operate multiple sites, separate activity by location to find outliers, then aggregate for the organization‑level view.
Electricity often dominates Scope 2, but the factor matters as much as usage. Use a factor aligned to your reporting approach, and document whether it reflects location averages or contracted attributes. Pair the result with operational signals such as kWh per square meter, load profiles, and peak demand periods to identify efficiency projects. When you change suppliers or add renewables, keep a note so the factor change is transparent in comparisons.
For many organizations, Scope 3 is the largest share because it includes travel, commuting, waste, and purchased goods. Begin with categories where you already have structured records, then expand toward supplier‑specific data. Spend‑based estimates help triage hotspots, but they can mask differences between low‑carbon and high‑carbon suppliers. Use the “top contributors” list to focus supplier engagement, travel policy changes, and waste prevention where they matter most.
After calculation, export the summary and line items for audit trails, dashboards, or ESG reporting. Track totals by scope and add intensity metrics (per employee, per revenue, per area) to normalize growth, mergers, or headcount swings. When setting targets, prioritize the largest sources first, define a baseline year, and monitor reductions using consistent factors and periods. This turns activity tracking into a repeatable management cycle, not a one‑off report.
It outputs kilograms of CO₂e for each line item and totals, plus a tonne conversion (tCO₂e) to match common ESG reporting formats.
Yes. Each activity field includes an editable factor input. Update them to match your preferred dataset, region, and methodology, then recalculate.
No. Headcount, revenue, and floor area are optional. They do not change totals; they only compute normalized indicators for benchmarking and trend analysis.
Scope 2 depends heavily on the electricity factor. Confirm your kWh and verify whether your factor represents the correct grid region and procurement approach.
Spend factors are screening tools. Use them to identify high-impact categories, then replace them with supplier or product-specific factors for better accuracy.
They include the latest calculated scope totals and the full line-item breakdown, enabling quick sharing with stakeholders and easy import into reporting templates.
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.