CO2 emissions calculator for fleets
Work out the kilograms of CO2 from the diesel, petrol, CNG, auto LPG or electricity your vehicles use, from the fuel itself or from distance and mileage. The emission factor, its unit and its published source sit beside the answer.
CO2 emitted
52.56 kg CO2
- Diesel used
- 20 L
- Emission factor
- 2.62818 kg CO2 per litre
- Factor source
- UK government (DESNZ), 2026 set, flat file version 1.2
- CO2 per km
- 0.219 kg CO2
- CO2 per delivery
- 1.752 kg CO2
CO2 emitted
52.56 kg CO2
How it is worked out
Fuels use the greenhouse gas conversion factors published by the UK government (DESNZ) for 2026. Electricity uses the average for India’s grid from the Central Electricity Authority’s CO2 Baseline Database for the Indian Power Sector, Version 22.0, August 2026, data for FY 2025-26.
- Fuel used (L, kg or kWh)
- = the fuel or electricity used, or distance ÷ mileage
- CO2 (kg)
- = fuel used × emission factor (kg of CO2 per L, kg or kWh)
- CO2 per km (kg)
- = CO2 ÷ distance
- CO2 per delivery (kg)
- = CO2 ÷ deliveries
| Fuel | CO2 per unit | Source and entry |
|---|---|---|
| Diesel | 2.62818 kg CO2 per litre | UK government (DESNZ), 2026 set, flat file version 1.2: Fuels › Liquid fuels › Diesel (100% mineral diesel), per litre |
| Petrol | 2.33955 kg CO2 per litre | UK government (DESNZ), 2026 set, flat file version 1.2: Fuels › Liquid fuels › Petrol (100% mineral petrol), per litre |
| CNG | 2.50268 kg CO2 per kg | UK government (DESNZ), 2026 set, flat file version 1.2: Fuels › Gaseous fuels › CNG, per tonne (2,502.68 kg CO2), divided by 1,000 |
| Auto LPG | 1.55491 kg CO2 per litre | UK government (DESNZ), 2026 set, flat file version 1.2: Fuels › Gaseous fuels › LPG, per litre |
| Electric | 0.675 kg CO2 per kWh | Central Electricity Authority, Version 22.0, August 2026, data for FY 2025-26: Table S, weighted average emission factor of the Indian grid, FY 2025-26 (0.675 tCO2/MWh) |
Worked example
The example values the calculator opens with, worked through step by step. CO2 emitted: 52.56 kg CO2.
| Step | Working | Result |
|---|---|---|
| Diesel used | 240 km ÷ 12 km/L | 20 L |
| CO2 emitted | 20 L × 2.62818 kg CO2 per litre | 52.56 kg CO2 |
| CO2 per km | 52.56 kg CO2 ÷ 240 km | 0.219 kg CO2 |
| CO2 per delivery | 52.56 kg CO2 ÷ 30 deliveries | 1.752 kg CO2 |
What it leaves out
A calculator answers the question it is given. These are the things to add, or check, yourself.
- Methane and nitrous oxide from burning the fuel. The same conversion factors put them at 1.3% on top of the CO2 of diesel, counted as CO2 equivalent (CO2e).
- Emissions from producing the fuel and bringing it to the pump (well to tank), and from building the vehicle.
- Biofuel blends: the petrol and diesel factors are for fuel with no ethanol or biodiesel. A blended fuel puts out less fossil CO2 per litre.
- For electric vehicles: charger and transmission losses, and power from your own solar panels. The factor is the average of all grid electricity in India over one year.
Questions
How much CO2 does a litre of diesel produce?
2.62818 kg of CO2 per litre, for diesel with no biodiesel, in the conversion factors published by the UK government (DESNZ) for 2026. Multiply the litres used by this factor.
What emission factor is used for electric vehicles?
The weighted average emission factor of India’s grid: 0.675 kg of CO2 per kWh, from the Central Electricity Authority’s CO2 Baseline Database for the Indian Power Sector, Version 22.0, August 2026, data for FY 2025-26. Multiply the kWh charged by it.
Why do the fuel factors come from the UK government?
They are published every year with their method, and list the CO2 of each fuel per litre or per kg, apart from the other gases. The grid factor comes from India’s Central Electricity Authority. Every answer names its factor and source, so you can check it against the factor your reporting uses.
Is CO2 the same as CO2e?
No. CO2e also counts other greenhouse gases as the CO2 that would warm as much. For burning fuel the difference is small; this calculator reports CO2, and this page says how much the other gases add.
Sources
Opened and checked on 2 Nov 2026. Rules and published figures change: check the current version before you rely on one.
Greenhouse gas reporting: conversion factors 2026
UK government (DESNZ)
Fuel factors from the 2026 set, flat file version 1.2: Scope 1 fuels, CO2 per litre or per tonne.
CO2 Baseline Database for the Indian Power Sector
Central Electricity Authority
Grid factor from Version 22.0, August 2026, data for FY 2025-26: Table S, the weighted average emission factor.
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