The cheapest way to get to work in New Orleans is rarely obvious: a monthly RTA Jazzy Pass runs about $55, but driving adds fuel, depreciation, and downtown parking. This free calculator puts both options side by side using the IRS mileage rate — the figure that captures the true cost per mile — so you can see which one actually wins each month.
How it works
The tool first computes monthly round-trip mileage, then prices driving two ways and compares the total to a flat transit pass:
round_trip_miles = one_way * 2 * days_per_month
irs_cost = round_trip_miles * irs_rate (~$0.67/mile, full cost)
fuel_cost = round_trip_miles / mpg * gas_price (fuel only)
driving_total = chosen_cost + monthly_parking
transit_total = rta_pass
It then reports the cheaper option and the monthly savings. The IRS basis is recommended because it includes depreciation, maintenance, and insurance, not just fuel.
Notes and example
A 10-mile one-way commute over 22 days is 440 round-trip miles. At the IRS rate that is about $295 in driving cost, plus $80 parking — roughly $375/month — versus the $55 RTA pass, making transit far cheaper here. Switch to fuel-only and driving looks deceptively cheap because it ignores wear and depreciation. Adjust the inputs to your route; everything runs in your browser.