Airport Parking vs Taxi Calculator

Leaving a car at the airport costs a little every day it sits there. A taxi costs a lot once and then nothing. That shape difference is the whole comparison: parking scales with the length of the trip, the fare does not, so short trips favour driving and long ones favour being driven. The break-even is simply the fare divided by the daily rate.

At the default figures, an 80 round-trip fare against 15 a day, that crossing point falls at 5.3 days. A three-day trip parks for 45 and so beats the fare by 35. A ten-day trip parks for 150 and loses to it by 70. Stretch to twenty days and parking costs 300, which is 220 worse than simply calling a car.

Both inputs move that crossing point sharply, which is why a figure from one airport rarely transfers to another. Raise the daily rate to 25 and the break-even drops to 3.2 days. Raise the fare to 120 instead and it stretches to 8 days. Off-airport lots, rail links and shuttle services each land somewhere on the same scale, and whichever is cheapest locally is the number that belongs in the comparison rather than the terminal rate.

Run it with sensible defaults

Using trip days of 10, a daily parking rate of 15 and a taxi round trip of 80, the calculation works out to 70.00 in favour of the taxi. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

Trip Days and Daily Parking Rate are the larger levers: at the default figures a 1% change in either moves the headline by 2.14%, against 1.14% for Taxi Round Trip Cost in the opposite direction. That asymmetry exists because the two parking inputs multiply together to reach 150 while the fare stands alone at 80, so the larger side carries more of the swing. Trip length is also the input most likely to change after the sum is done, since a delayed return adds parking days but not fare.

How the math works

Trip days multiplied by the daily parking rate gives the total parking cost, and the taxi round trip is subtracted from it. The headline is the size of that difference, labelled to show which option is ahead, so a positive gap reads as the taxi saving and a negative one as parking saving. Nothing here is annualised or compounded: it is one trip, at one set of prices, with the daily rate held flat for every day of the stay.

Why see the number at all

The two costs are hard to compare in the moment because they arrive so differently. A fare is one visible number quoted up front, while parking is a small daily figure that only becomes a real sum when multiplied by a trip length nobody does in their head at the terminal. Putting both on the same footing is the point of the exercise. What the figure cannot carry is anything that is not money. A fuller comparison would weigh the non-financial side alongside the number rather than after it, which matters most on short trips where the gap is narrow enough for it to decide the question.