Rideshare Cost Compare Calculator Formula

Understand the math behind the rideshare cost compare calculator. Each variable explained with a worked example.

Formulas Used

Rideshare Cost

rideshare_total = rideshare_base + rideshare_per_mile * trip_miles

Own Car Cost (with parking)

own_car_total = own_car_cost_per_mile * trip_miles * 2 + parking_cost

Cheaper Option Saves

savings = abs((rideshare_base + rideshare_per_mile * trip_miles) - (own_car_cost_per_mile * trip_miles * 2 + parking_cost))

Variables

VariableDescriptionDefault
rideshare_baseRideshare Base Fare(USD)3
rideshare_per_mileRideshare Rate per Mile(USD/mile)1.5
trip_milesTrip Distance(miles)8
parking_costParking Cost (if driving)(USD)10
own_car_cost_per_mileYour Car Cost per Mile(USD/mile)0.67

How It Works

Rideshare vs Driving Cost Comparison

Comparing rideshare fares to the true cost of driving (including fuel, depreciation, insurance, and parking) reveals when each option makes financial sense.

Formula

Rideshare = Base Fare + Per Mile Rate x Distance

Own Car = Cost per Mile x Distance x 2 (round trip) + Parking

The IRS mileage rate ($0.67/mile in 2024) captures total car ownership costs. For short trips with expensive parking, rideshare often wins.

Worked Example

An 8-mile trip, rideshare at $3 base + $1.50/mile, own car at $0.67/mile + $10 parking.

rideshare_base = 3rideshare_per_mile = 1.5trip_miles = 8parking_cost = 10own_car_cost_per_mile = 0.67
  1. 01Rideshare = $3 + $1.50 x 8 = $15.00
  2. 02Own car = $0.67 x 8 x 2 + $10 = $10.72 + $10 = $20.72
  3. 03Rideshare saves $5.72 on this trip