Parking Meter Calculator
Work out what a parking stay costs at an hourly rate with meter time steps, or how long a given amount of money buys.
Quick Duration
Updated Formula covered by automated tests
Street meters and pay-by-phone zones post an hourly rate, but you rarely park for a round number of hours, and many meters only sell time in fixed steps. This tool works out what a stay will cost at a given rate, rounds the time up the way a meter does when you choose a step size, and answers the reverse question: how long will the coins or the bill in your hand keep you legal.
It is handy before a doctor’s appointment, a long lunch downtown or a day of meetings, when you are deciding between feeding a meter, using a garage with a daily maximum, or taking transit instead. Compare the meter total with the garage’s posted flat rate before you commit.
The formula
- t
- Time you intend to park, in hours
- s
- Smallest block of time the meter sells, in minutes (choose “any amount” if the app bills by the minute)
- ⌈ ⌉, ⌊ ⌋
- Round up to the next block when paying for a stay; round down to whole blocks when asking what a sum of money buys
- rate
- Posted price per hour in dollars
- money
- The amount you are willing or able to put in
A meter is a straight proportion between money and time, so the basic cost is just the hourly rate times the hours parked. The catch is granularity. A coin meter that sells 15 minutes per quarter at $1.00 an hour cannot sell you 7 minutes, so a 2 hour 20 minute stay is billed as 2 hours 30 minutes. Rounding up the time before multiplying reproduces that.
Going the other way, money divided by the hourly rate gives hours, and the meter only credits whole blocks, so the result is rounded down. That is why a $5 bill in a 15-minute meter at $3.50 an hour buys 75 minutes rather than the 85.7 minutes the raw arithmetic suggests.
Worked example
Marcus has a dental appointment that he expects to take 2 hours 20 minutes, including the walk. The street meter charges $3.50 an hour and sells time in 15-minute blocks. He also has a single $5 bill.
- 1 Convert the stay to minutes: 2 × 60 + 20 = 140 minutes (2.33 hours).
- 2 Round up to whole 15-minute blocks: 140 ÷ 15 = 9.33, so 10 blocks = 150 minutes = 2.5 hours.
- 3 Cost: $3.50 × 2.5 = $8.75. Billing by the minute would have cost $3.50 × 140 ÷ 60 = $8.17.
- 4 Check the $5 bill: 5 ÷ 3.50 × 60 = 85.7 minutes, rounded down to 5 blocks = 75 minutes.
Result: Marcus should plan on $8.75 for the meter. His $5 bill alone would run out after 1 hour 15 minutes, well before the appointment ends.
Before you rely on the result
- Some cities use demand-based pricing that changes the rate by time of day or block, and some charge a higher rate after the first hour. Run each period separately if the rate changes during your stay.
- The calculator does not know local time limits, enforcement hours or the cost of a ticket. Read the posted signs before relying on the result.
Frequently asked questions
Is it cheaper to use a parking garage than a street meter?
It depends on how long you stay. Garages often charge a high first hour but cap the day at a flat maximum. Multiply the meter rate by your hours and compare it with the garage’s posted daily rate; for stays beyond a few hours the garage frequently wins, and many street meters have a time limit anyway.
Can I add more time to a meter after my limit runs out?
Many cities prohibit “feeding the meter” past the posted maximum stay, even if you pay, because time limits exist to make drivers turn over spaces. The sign on the block, not the meter’s willingness to take money, determines how long you may legally stay.
Why does the app charge a little more than this calculator?
Pay-by-phone services often add a per-session convenience fee, typically a flat amount per transaction, on top of the meter rate. Enter the rate shown in the app and add the fee yourself to see the true total.
Do I have to pay the meter on evenings, Sundays or holidays?
Enforcement hours vary by city and even by street. The hours are printed on the meter or on nearby signs; outside those hours parking is usually free, but other rules such as street cleaning or tow-away zones may still apply.