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Carpooling Calculator

Calculate carpooling cost per person, fuel savings, and CO₂ reduction. Split trip expenses fairly among passengers with tolls and parking.

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Quick presets:
Trip Details
km
trips/yr
Fuel & Vehicle
L/100km
g/km
€/km
Extra Costs
€
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About

Fuel cost allocation errors in shared commutes cause persistent disputes and financial loss over time. A round-trip commute of 50 km at 8 L/100km consumption and 1.60 €/L costs 6.40 € in fuel alone. Add vehicle depreciation at roughly 0.05 €/km, tolls, and parking, and the true per-trip cost rises significantly. This calculator applies the full cost model: fuel consumption × distance × price, plus fixed costs (tolls, parking) and optional maintenance depreciation, then divides by n occupants. It projects annual savings and CO&sub2; reduction based on the EU fleet average of 120 g/km. The tool approximates maintenance using a flat per-kilometer rate. Actual depreciation depends on vehicle age, make, and driving conditions.

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Formulas

The total trip cost aggregates fuel, tolls, parking, and optional maintenance wear:

Ctotal = Cfuel + Ctolls + Cparking + Cmaint

Where fuel cost is derived from distance, consumption rate, and unit price:

Cfuel = D × FC100 × Pfuel

Maintenance cost uses a flat depreciation rate per kilometer:

Cmaint = D × Rmaint

The per-person share divides total cost by all occupants (driver included):

Cperson = Ctotaln

Savings per person compare solo cost against the carpooled share:

S = Ctotal − Cperson

CO&sub2; reduction estimates the emissions avoided by removing (n − 1) cars from the road:

CO2saved = (n − 1) × D × Erate

Where D = one-way distance (doubled if round trip), FC = fuel consumption in L/100km, Pfuel = fuel price per liter, Rmaint = maintenance rate per km, n = total occupants including driver, Erate = CO&sub2; emission rate in g/km.

Reference Data

Vehicle TypeAvg. ConsumptionCO&sub2; EmissionsApprox. Maintenance CostTypical Passengers
Compact Car (Petrol)6.5 L/100km120 g/km0.04 €/km4
Compact Car (Diesel)5.0 L/100km110 g/km0.04 €/km4
Sedan (Petrol)8.0 L/100km150 g/km0.05 €/km4
Sedan (Diesel)6.5 L/100km130 g/km0.05 €/km4
SUV (Petrol)10.5 L/100km200 g/km0.07 €/km5
SUV (Diesel)8.5 L/100km180 g/km0.07 €/km5
Minivan9.0 L/100km185 g/km0.06 €/km7
Hybrid (Petrol)4.5 L/100km90 g/km0.05 €/km4
Electric Vehicle18 kWh/100km0 g/km (tailpipe)0.03 €/km4
Pickup Truck12.0 L/100km250 g/km0.08 €/km3
Sports Car11.0 L/100km220 g/km0.09 €/km2
Motorcycle4.0 L/100km85 g/km0.03 €/km1-2
City Car / Micro5.0 L/100km100 g/km0.03 €/km4
Large Van11.0 L/100km210 g/km0.06 €/km8

Frequently Asked Questions

This calculator divides total cost equally among all occupants, including the driver. This is the most common fair-split model because it accounts for total vehicle operating cost. However, some groups exclude the driver from the split (dividing by n − 1) to compensate for driving effort and vehicle depreciation. You can simulate this by reducing the passenger count by one.
The tool uses a flat per-kilometer rate (default 0.05 €/km) which approximates tire wear, oil changes, brake pads, and general depreciation. The IRS 2024 standard mileage rate is 0.67 $/mile (0.42 €/km), but this includes fuel and insurance. For pure maintenance, 0.03 - 0.08 €/km is typical depending on vehicle age and type.
No. The estimate uses a constant emission rate (default 120 g/km, the EU fleet average). Real emissions are higher during cold starts (up to 3× for the first 5 km) and in stop-and-go traffic. For highway commutes, the estimate is reasonably accurate. For short urban trips, actual CO&sub2; may be 15 - 30% higher.
The calculator multiplies per-trip savings by the selected frequency (e.g., 5 trips/week × 52 weeks = 260 trips/year). This assumes consistent commuting without holidays. For a realistic estimate, reduce by 10 - 15% to account for vacation days, sick leave, and remote work days. The “Custom” frequency option lets you input your actual trip count.
This calculator assumes all passengers travel the full distance. For partial-route sharing, you would need to calculate segment costs separately. A practical approximation: if a passenger rides 60% of the distance, they should pay 60% of the per-person share. Multiply their share by the fraction of distance they cover.
Fuel type affects both the price per liter and the consumption rate. Diesel vehicles typically consume 15 - 25% less fuel than petrol equivalents, but diesel fuel may cost more in certain countries. For electric vehicles, replace fuel consumption with electricity cost: 18 kWh/100km at 0.30 €/kWh = 5.40 €/100km, typically 50 - 70% cheaper than petrol.