Carpooling Calculator
Calculate fuel cost savings and per-person cost when carpooling versus driving alone.
Formula
Per-person cost = (miles × 2 × days × gas/mpg) ÷ riders
- Assumes equal cost sharing among all riders.
- Annual savings = weekly savings × 52 weeks.
- Does not include parking or toll sharing.
20 mi commute, 5 days, 3 riders at 28 mpg
Inputs
- One-Way Distance: 20 mi
- Days per Week: 5
- Fuel Economy: 28 mpg
- Gas Price: 3.5 $/gal
- Number of Riders: 3
Weekly miles = 200 (round trip). Fuel = 200/28×$3.50 = $25/week. Per person = $8.33. Savings vs solo = $16.67/week ($867/yr).
Frequently asked questions
How is cost split in a carpool?
This calculator assumes equal splitting. You can also rotate driving responsibilities.
What else can I save with carpooling?
Reduced wear and mileage on your car, potentially lower insurance rates, and toll sharing.
Is carpooling environmentally friendly?
Yes — 3 riders in one car cuts per-person CO₂ emissions by ~66%.
Can I use this for ride-hailing?
No — this is for private carpooling. Ride-hail apps have different pricing structures.