Example 1
- 8000 km
- car 50%
- bus 15%
- rail 10%
- EV 5%
- bike 20%
- 6.5 L
- 1.2 people
- 17 kWh
- grid 350
663.9 kg CO₂
How much from a multimodal commute of 8000 km and 50% car? 663.9 kg CO₂. A mix, not a ticket.
Multimodal commute
Type km and shares. 8000, 50/15/10/5/20, 6.5 L, 1.2 people, 17 kWh and 350 give 663.9 kg CO₂. 12000 and 70% car give 1,532.9 kg CO₂. 5000 and more rail give 292.6 kg CO₂.
A mix. 8000 km and 50% car give 663.9 kg CO₂. Bike adds no CO₂.
Results
Enter data and click Calculate.
How it works
Multimodal commute in this calculator is kg CO₂ from km and shares. 8000 km, 50% car, 15% bus, 10% rail, 5% EV, 20% bike, 6.5 L/100, 1.2 people, 17 kWh/100 and grid 350 give 663.9 kg CO₂. 12000 and 70% car give 1,532.9 kg CO₂. 5000 and more rail give 292.6 kg CO₂.
Shares divide by their sum. Car = (km×car%/100)/100 × L/100 × 2.31 / people. Bus 0.089 kg/km, rail 0.041. EV = (km×EV%/100)/100 × kWh/100 × grid/1000. Bike stays zero.
663.9 kg CO₂ is not a ticket. 1,532.9 kg CO₂ is more car. 292.6 kg CO₂ is a shorter year.
Flight carbon footprint next door counts one leg and RFI. EV vs petrol splits a year across two cars. Here the mix stays: 8000 and 50% car stay 663.9 kg CO₂.
Type 8000, 50, 15, 10, 5, 20, 6.5, 1.2, 17 and 350, then Calculate. A comma in 6.5 parses. A share sketch, not a transit app.
8000 and 50% car give 663.9 kg CO₂. 12000 and 70% give 1,532.9 kg CO₂. 5000 and more rail give 292.6 kg CO₂. Another car share at 8000 changes 663.9.
Formula
shares = typed / sum × 100. car = (km×car%)/100 × L/100 × 2.31 / people. bus = km×bus% × 0.089. rail = km×rail% × 0.041. EV = (km×EV%)/100 × kWh/100 × grid/1000. sum without bike.
How to use
- Type 8000 km and 50, 15, 10, 5 and 20 as shares.
- Add 6.5 L/100, 1.2 people, 17 kWh/100 and grid 350.
- Click Calculate. The result is 663.9 kg CO₂.
- 12000 and 70% car give 1,532.9 kg CO₂. 5000 and more rail give 292.6 kg CO₂.
- Shares normalise. Bike adds no CO₂.
8000 km / 50% car = 663.9 kg CO₂
A mix. 8000 km and 50% car give 663.9 kg CO₂. Bike adds no CO₂.
- Multimodal
- Five shares. Bus 0.089 and rail 0.041. 5000 km leaves 292.6 kg CO₂.
- commute
- Annual km. 8000 at 50% car leave 663.9 kg CO₂. 12000 at 70% give 1,532.9.
- bike
- A share with no CO₂. 20% at 8000 leaves the car share inside 663.9 kg CO₂.
Examples
Example 2
- 12000 km
- car 70%
- bus 10%
- rail 5%
- EV 5%
- bike 10%
- 7 L
- 1 person
- 18 kWh
- grid 400
1,532.9 kg CO₂
How much from 12000 km and 70% car? 1,532.9 kg CO₂.
Example 3
- 5000 km
- car 30%
- bus 20%
- rail 20%
- EV 10%
- bike 20%
- 6 L
- 1.5 people
- 16 kWh
- grid 300
292.6 kg CO₂
How much from 5000 km and more rail? 292.6 kg CO₂.
Related calculators
Common questions
How much from 8000 km and 50% car?
663.9 kg CO₂. Shares normalise. Bike adds no CO₂.
How much at 12000 km and 70% car?
1,532.9 kg CO₂. More km and more car.
How much at 5000 km and more rail?
292.6 kg CO₂. A shorter year and 20% rail.
Must shares sum to 100?
No. The code divides them by the sum. 50+15+10+5+20 is already 100.
Does bike add CO₂?
No. Zero in the sum. 20% bike at 8000 leaves the other modes.
Where do 0.089 and 0.041 come from?
Bus and rail kg/km constants in the code. You do not load them from a timetable.
Does a comma in 6.5 work?
Yes. 6,5 and 6.5 are the same L/100.
How is this different from EV vs petrol?
That card uses two cars and an EV share. Here bus, rail and bike sit in one year.
Is this a transit card?
No. A result from km and shares. The operator sits outside this calculator.
Knowledge sources
The factors on the page are a sketch. Below are EPA emissions terms, not a national inventory.
Page updated in 2026.