One vehicle at a time
Coaches, midibuses and minibuses are entered individually, each with its own fuel type and consumption.
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Bus rental with driver
Travelling together. Doing your part for the planet.
For tourist coaches, group trips and transfers: estimate your vehicles' emissions starting from real consumption, reduce where possible and support documented projects to offset.
The correct scope
Count the whole service, not just the journey with passengers.
The most solid data comes from the fleet's actual refuelling. Alternatively, start from kilometres with the vehicle's average consumption.
Real mileage
Kilometres include empty transfers, return trips to the depot and positioning, not just the journey with passengers.
Documented consumption
The preferred figure is the litres, kilograms or kWh actually refuelled during the year, taken from fuel accounting.
Electric charging
An electric bus is not zero-emission: the estimate takes into account the production of the electricity consumed.
Transfers and return trips are part of the job.
If you use kilometres, also add empty runs. If you use annual fuel, that figure already includes waiting and idling: do not apply mark-ups.
This calculator covers buses, coaches and minibuses. Chauffeur cars and boats follow separate paths.
How it is used
Different services, the same discipline on data.
Group trips and tourism
A multi-day itinerary is best read with the actual refuelling of the declared period.
Transfers and shuttles
Repeated short routes often include many kilometres of repositioning: these must be counted.
Contract services
A single contract requires a defined period and consumption data attributable to that service.
From data to commitment
Understand, reduce, then contribute.
- 01
Data
Collect the fleet's mileage and refuelling for the chosen period, vehicle by vehicle.
- 02
Estimate
Calculate operational CO₂ with stated factors, units, year and geography.
- 03
Reduction
Assess empty runs, trip scheduling, maintenance and driving style.
- 04
Offsetting and documentation
The remaining emissions can be complemented by documented projects and retirements, verifiable over time.
Offsetting complements emission reduction. The calculator's result does not prove that a contribution or retirement took place.
Bus calculator
Estimate the operational CO₂ of your bus fleet.
Enter a real consumption for each vehicle. No coefficients for make, capacity, area or registration year.
Transparent method
How we calculate emissions
With actual annual consumption: litres, kilograms or kWh refuelled × kg CO₂ factor per unit. With average consumption: annual km × consumption per 100 km ÷ 100 × the same factor. The fleet total is the sum of the individual vehicles, with no further corrections.
| Fuel type | Factor | Year and geography | Boundary | Source row |
|---|---|---|---|---|
| Diesel | 2,55035 kg CO₂/l | 2026 Regno Unito (proxy) | CO₂ diretta, combustione | DESNZ 2026, flat file «ghg-conversion-factors-2026-flat-format-revised.xlsx», foglio «Factors by Category», ID 1_101_1011_8_2 (kg CO₂e of CO₂ per unit); verificato sul file ufficiale il 2026-09-15 |
| Metano (CNG) | 2,50268 kg CO₂/kg | 2026 Regno Unito (proxy) | CO₂ diretta, combustione | DESNZ 2026, flat file «ghg-conversion-factors-2026-flat-format-revised.xlsx», foglio «Factors by Category», ID 1_100_1001_15_2 — CNG, tonnes, 2502,68 kg CO₂e of CO₂ per tonnellata, qui espresso per kg (÷1000); verificato sul file ufficiale il 2026-09-15 |
| Elettrico | 0,1926 kg CO₂/kWh | 2024 definitivo Italia, consumo nazionale | CO₂ della produzione elettrica consumata | ISPRA, Rapporto 430/2026 — allegato «FE_energia_elettrica_2025-V2.xlsx», foglio «9», colonna «Consumi elettrici», riga anno 2024 (192,595 g CO₂/kWh); verificato sul file ufficiale il 2026-09-15 |
Included
Fuel combustion of the declared vehicles and production of the electricity consumed by electric buses, over the stated period.
Excluded
Fuel extraction and distribution, manufacturing and maintenance of vehicles and batteries, infrastructure, ground services and life cycle. The result is CO₂, not full CO₂e.
Passengers
The per passenger-km indicator only appears if you declare the passenger-km for the period. It does not change the total and is not derived from the number of seats.
Audit of the previous calculator, sources and limits
The previous public version used average kg/km factors by vehicle size, undocumented multipliers by area (from 0.95 to 1.20) and by registration year (from 0.95 to 1.30), a default electric consumption by capacity, and a grid factor editable by the user. Per-passenger intensity was derived from the number of seats multiplied by an assumed average load factor of 75%, and the result was labelled CO₂e. That logic has not been reused.
The new calculation starts from the declared consumption. For diesel and methane we use only the direct combustion CO₂ component from DESNZ 2026 (Scope 1, UK geography as a proxy in the absence of an Italian factor directly applicable per fuel unit), respectively 2.55035 kg CO₂/l and 2.50268 kg CO₂/kg. For electric we use the final Italian national consumption factor for 2024 from ISPRA, 192.6 g CO₂/kWh, i.e. 0.1926 kg CO₂/kWh; the 2025 preliminary value is not adopted. No summing across different boundaries, no arbitrary conversion between units.
Frequently asked questions
Clear boundaries on the road too.
Bring your fleet's real data into the HapGree journey.
We assess together the scope, data quality and next steps.