Example 1
- Mode: intensity
- 120 g/km
- Distance: 100 km
- No WTT
CO₂ ≈ 12 kg
Assumes metric units.
Trip CO₂ emissions calculator
Pick type-approval, fuel, or BEV (a fully electric car) and type a distance. 120 g/km over 100 km is 12 kg of CO2, carbon dioxide. This is an educational model from your numbers, not a type-approval certificate and not an ESG audit.
Units follow the header. Example cards assume km, L/100 km, and g CO₂/kWh. A trip estimate, not a certificate. Measure economy on the fuel consumption page.
Result
Emissions or economy, plus distance. CO₂ shows up here.
How results are calculated
Type-approval mode: kilograms = grams per kilometer times distance, divided by 1000. 120 g/km × 100 km = 12 kg. 95 g/km over 40 km is 3.8 kg. 140 g/km over 500 km is 70 kg, and with a WTT (well-to-tank, from well to tank) add-on of 15% you get 80.5 kg.
Fuel mode: liters from L/100 km times distance, then times a kg-CO2-per-liter factor. 7 L/100 km of petrol over 200 km is 14 L × 2.31 = 32.34 kg. Diesel at 5.5 L/100 km over 280 km is about 41.27 kg. LPG at 9 L/100 km over 45 km is about 6.28 kg. Built-in factors: petrol 2.31, diesel about 2.68, LPG about 1.55 kg/L.
BEV mode multiplies kWh from the distance by grid intensity. 18 kWh/100 km and 350 g/kWh over 100 km is 6.3 kg. The same trip at 16 kWh and a 650 g/kWh grid is 10.4 kg. Zero at the tailpipe is not zero in this calculator, because it counts electricity from the plug.
Fields follow the mode: grams per distance, or consumption and fuel type, or energy use and grid intensity, plus distance. Optional A/B compare, trips per year, and a WTT percent. The US header relabels; a typed 120 is not converted to per mile by itself.
L/100 km lives on the fuel consumption page. There is no pump price here. 7 L/100 km of petrol is not the same as 120 g/km from type-approval: one path uses liters and a factor, the other uses grams per kilometer.
Type 120 and 100 in type-approval, click Calculate, and match 12 kg. That is an estimate from the model, not a line from a registration document and not a WLTP certificate.
How to use
- Pick a mode: type-approval (g per distance), fuel use and fuel type, or BEV with kWh and grid intensity.
- In type-approval, type emission, for example 120, and distance, for example 100 km.
- Click Calculate. 120 g/km × 100 km = 12 kg. In fuel mode, 7 L/100 km of petrol over 200 km is 32.34 kg.
- Optionally turn on A/B compare, trips per year, or a WTT add-on, for example 15%.
- Example cards assume metric units. The result is an estimate, not a type-approval certificate.
CO2, BEV, and WTT on this trip
Kilograms from type-approval, fuel, or the grid. 120 g/km over 100 km is 12 kg of CO2. 18 kWh and 350 g/kWh over 100 km is 6.3 kg. WLTP is not a field.
- CO2
- Carbon dioxide in this calculator. 120 g/km × 100 km = 12 kg. 7 L/100 km of petrol over 200 km is 14 L × 2.31 = 32.34 kg.
- BEV
- A fully electric car: kWh from distance times grid intensity. 18 kWh/100 km and 350 g/kWh over 100 km = 6.3 kg, not zero.
- WTT
- Well-to-tank, an optional percent. 140 g/km over 500 km is 70 kg; with 15% WTT that is 80.5 kg. A supply-chain sketch, not tailpipe.
- type-approval
- Grams-per-distance mode. 95 g/km over 40 km = 3.8 kg. Your typed number, not a type-approval certificate.
Usage examples
Example 2
- Mode: fuel
- 7 L/100 km
- Petrol
- 200 km
CO₂ ≈ 32.34 kg
2.31 kg CO₂/L × 14 L.
Example 3
- Mode: EV
- 18 kWh/100 km
- Grid: 350 g/kWh
- 100 km
CO₂ ≈ 6.3 kg
18 kWh × 350 g/kWh.
Example 4
- Mode: type-approval
- Emission: 95
- Distance: 40
CO2 ≈ 3.8 kg
How much CO2 on a 40 km commute at 95 g/km? CO2 ≈ 3.8 kg.
Example 5
- Mode: fuel
- Consumption: 5.5
- Fuel type: diesel
- Distance: 280
CO2 ≈ 41.27 kg
How much CO2 on a 280 km highway run at 5.5 L/100 km diesel? CO2 ≈ 41.27 kg.
Example 6
- Mode: fuel
- Consumption: 9
- Fuel type: lpg
- Distance: 45
CO2 ≈ 6.28 kg
How much CO2 on a 45 km city loop on LPG at 9 L/100 km? CO2 ≈ 6.28 kg.
Example 7
- Mode: BEV
- Energy use: 16
- Grid intensity: 650
- Distance: 100
CO2 ≈ 10.4 kg
How much CO2 for a BEV at 16 kWh/100 km and a 650 g/kWh grid over 100 km? CO2 ≈ 10.4 kg.
Example 8
- Mode: type-approval
- Emission: 140
- Distance: 500
- Add estimated well-to-tank add-on: yes
- WTT add-on (%): 15
CO2 ≈ 80.5 kg with 15% WTT
How much CO2 on 500 km at 140 g/km plus a 15% well-to-tank add-on? CO2 ≈ 80.5 kg with 15% WTT.
Related calculators
FAQ
How many kg of CO2 over 100 km at 120 g/km?
12 kg. 95 g/km over 40 km is 3.8 kg. 140 g/km over 500 km is 70 kg, or 80.5 kg with 15% WTT.
What does 7 L/100 km of petrol over 200 km give?
14 L × 2.31 = 32.34 kg. That is not the same as 120 g/km: a different path and a different factor.
What is WTT?
Well-to-tank, from well to tank: an optional percent of trip emissions. A supply-chain estimate, not a tailpipe measurement.
Is BEV zero-emission here?
At the tailpipe, yes. Here a BEV (fully electric car) multiplies kWh by grid intensity. 18 kWh and 350 g/kWh over 100 km is 6.3 kg.
Where do fuel factors come from?
Built-in: petrol 2.31 kg/L, diesel about 2.68, LPG about 1.55. You do not type them by hand.
Does A/B change the formula?
No. The same mode on both sides. The result is a kilogram gap, not a new chemistry.
Is this a type-approval certificate?
No. It is an educational model from numbers you type. It does not replace WLTP, a COC, or an ESG audit.
BEV at 16 kWh/100 km and 650 g/kWh over 100 km?
10.4 kg. Diesel at 5.5 L/100 km over 280 km is about 41.27 kg. LPG at 9 L/100 km over 45 km is about 6.28 kg.
Does the US switch convert a typed 120?
No. On an empty field it relabels. It does not multiply a typed number by a mile.
Is 7 L/100 km of petrol the same as 120 g/km?
No. Type-approval uses g/km. Fuel uses liters and a kg/L factor. Use A/B if you want both paths.
Knowledge sources
Use, cost or emissions come from your numbers. Below are FuelEconomy.gov, EPA and SI terms.
Page updated in 2026.