How it works
Start with the maintenance schedule for your exact car and the way you drive it. Enter the price of one recurring service along with its distance and time intervals. The calculator uses whichever interval comes up sooner, which means it takes the larger annual service rate. If your schedule has several kinds of service, use this row for the most common one and budget the rest separately.
The tire allowance spreads the cost of an installed set over the distance you expect it to last. It doesn't inspect your tires or pick a replacement date. Work that's already due is counted once, and the other annual reserve covers anything not already in service or tires. The headline monthly figure is what you'd set aside for recurring costs; the second monthly average also spreads the immediate work across the whole planning period.
The formula behind the estimate
Every result starts with a defined model and visible assumptions.
Annual routine service reserve = service price × max(annual distance ÷ service distance interval, 12 ÷ service month interval) Annual tire reserve = installed tire-set cost × annual distance ÷ tire distance allowance Annual recurring reserve = service reserve + tire reserve + other annual reserve Period budget = recurring reserve × years + known work due now Monthly recurring reserve = annual recurring reserve ÷ 12
A worked example
At 12,000 miles a year, a $150 service every 6,000 miles or six months comes to $300 a year. A $600 set of tires spread over 40,000 miles adds $180 a year. Add a $300 reserve for other work and you're at $780 a year, or $65 a month. Over five years that's $3,900, plus any work already due. Every price and interval here is illustrative.
Is a maintenance reserve the same as a service calendar?
No. A fractional service rate is a handy way to build a savings target. If you need 1.5 services a year, for example, you're really saving for three services every two years. Your actual appointments depend on the date and mileage of your last service, how you drive and what the manufacturer says. This tool doesn't ask for that history, so it can't tell you when the next appointment is due.
Tires can need replacing sooner than the distance you entered, depending on age, tread, damage, load and driving conditions. Budgeting doesn't replace checking the tires or following the manufacturer's instructions.
How is maintenance different from a repair quote?
A reserve is money set aside for work that may come up. A written repair quote is a specific job. Put a known job in the work-due-now field and don't add the same amount to the recurring reserve as well. A bigger reserve makes a good stress test, but it isn't a prediction of how reliable the car is.
This plan keeps prices and distance fixed. Update the quotes and intervals when the car or your driving changes, and carry the maintenance budget into a full ownership comparison only once.
Questions worth asking
How much should I save each month for car maintenance?
It depends on your car's service schedule, local quotes, tire costs and other expected work, so use the monthly reserve this calculator gives you from your own inputs. The example figure isn't a recommended amount for everyone.
Does time or mileage decide how often a car needs service?
Whichever comes first. The model uses the shorter interval and turns it into an annual reserve rate, but you should follow the manufacturer's schedule for real appointments.
Why is the service rate sometimes a fraction?
Because it's a savings rate spread over time, not a count of services due next calendar year. A rate of 1.5 simply means you're setting aside money for one and a half services each year.
Does the tire interval tell me when my tires are safe?
No. It's only a savings assumption. Tire age, condition, wear and the manufacturer's instructions decide when they need replacing.
Can I use kilometers and another currency?
Yes. Switching distance units converts all the distance inputs together, and the eight currency choices change the labels. Money amounts aren't exchanged automatically.
This is general information, not personalized financial advice. Read the limitations.
