Is it cheaper to drive to work in St. Louis or buy a Metro pass? Gas alone tells only part of the story — the honest comparison has to include parking, maintenance, and depreciation. This calculator pits your real driving cost against the $70 Metro monthly pass so you can see the true monthly difference.
How it works
The transit side is simple: a flat $70/month Metro pass for unlimited MetroBus and MetroLink rides. The driving side is built per mile:
fuel per mile = gas price / MPG
non-fuel per mile ≈ $0.37 (maintenance + depreciation)
driving per mile = fuel per mile + 0.37
monthly driving = (round-trip miles × commute days) × driving per mile + parking
The tool multiplies your round-trip distance by your commute days to get monthly miles, prices each mile, adds parking, and compares the total to the transit pass — reporting which option is cheaper and the monthly savings.
Example and notes
A 20-mile round trip, 21 days a month, at 27 MPG and $3.10 gas costs about $0.115 per mile for fuel plus $0.37 for upkeep, so 420 miles runs roughly $203 plus $85 parking — about $288/month to drive. Against the $70 Metro pass, transit saves over $200/month here. Shorten the commute or remove paid parking and driving can pull ahead; the calculator updates instantly as you change the inputs.