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Per-Mile Maintenance Reserve Calculator

Enter your yearly maintenance cost and miles to find your per-mile reserve.

Result

$0.1500 / mile
$150.00
12,000 miles/yr

How it is calculated

The tool spreads one year of maintenance spending over one year of driving. The reserve per mile is per mile = annual maintenance cost ÷ annual miles, shown in dollars to 4 decimals. The monthly reserve is annual maintenance cost ÷ 12, which depends only on the cost, not on the miles. Maintenance cost is the total for the year in dollars; miles are the miles driven that year. Miles must be above zero and the cost cannot be negative. A cost of 0 simply returns 0. The figure is an average: it treats every mile as costing the same, whereas real repairs arrive in lumps, tyres and brakes wear faster with distance, and older vehicles cost more. Fuel, insurance and depreciation are not part of it.

Worked example

A van costs $1,800 a year to maintain (oil changes, tyres, brakes, small repairs) and is driven 12,000 miles a year. Reserve per mile = 1,800 ÷ 12,000 = $0.1500 / mile, or 15 cents. Monthly reserve = 1,800 ÷ 12 = $150.00. The miles line confirms the 12,000 miles/yr used. If next year the van does 18,000 miles with the same $1,800 budget, the rate falls to 10 cents per mile, but the repairs will likely cost more in reality.

Try this example →

Common mistakes

  • Entering monthly maintenance as the annual figure. The cost field is for the whole year, so $150 a month must be entered as 1,800, not 150.
  • Entering kilometres. The rate is per mile, so convert first (1 km is about 0.62 mile); entering kilometres would show a per-mile rate that is too low.
  • Using miles from a different period than the cost. If the cost covers a full year but the miles cover only six months, the per-mile rate is doubled.
  • Leaving out big one-off jobs such as a timing belt or new tyres. These raise the real annual cost, so average them over their lifespan before adding them in.
  • Treating the figure as the full cost of driving. Fuel, insurance, registration and depreciation are separate and are not included.

About this calculator

A per-mile maintenance reserve spreads a vehicle’s expected annual maintenance cost evenly across the miles it actually drives, giving a per-mile dollar figure you should set aside for every mile on the odometer so repairs never come as a budget surprise. The calculation is simply annual maintenance cost ÷ annual miles driven, which the calculator also converts into a monthly reserve amount.

Fleet managers and trucking companies use this figure to build maintenance reserve accounts, set per-mile lease or rental rates that actually cover upkeep, and benchmark one vehicle or route against another regardless of how many miles each racks up. Owner-operators use the same math for personal budgeting — knowing the true per-mile cost of ownership (beyond fuel) is what separates an accurate cost-per-mile estimate from one that ignores maintenance until a major repair bill hits.

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Comments (1)

  • Editorial team

    The monthly figure depends only on the yearly cost, while the per-mile rate shifts with how far you drive. With 1,200 spent over 15,000 miles you get 8 cents a mile and 100 a month, and a quiet year does not lower the monthly line. Repairs arrive in lumps, so a reserve account smooths them. Do you count tyres inside maintenance or separately?

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