How to use this calculator
- Enter or choose vehicles.
- Enter or choose distance per vehicle per year.
- Enter or choose routine maintenance per km.
- Enter or choose cost of a full tyre set.
- Enter or choose tyre set life.
- The monthly reserve for the fleet updates as you type. Use Copy result or Share to keep it.
Method
Per km = (Routine + Tyre set ÷ Tyre life + Major cost ÷ Interval) × (1 + Contingency% ÷ 100); Annual = Per km × km per vehicle × Vehicles; Monthly = Annual ÷ 12
- Routine
- servicing, oil, filters and small repairs per km
- Tyre life
- km a full set lasts
- Interval
- km between major repairs
Worked example
- Per km = 0.05 + 3,000 ÷ 150,000 + 12,000 ÷ 400,000 = 0.05 + 0.02 + 0.03 = 0.10.
- With 10% contingency: 0.11 per km.
- Annual = 0.11 × 100,000 km × 10 vehicles = 110,000; monthly = 9,166.67.
Set aside about 9,166.67 a month (0.11 per km) to cover the fleet’s maintenance, tyres and major repairs.
What the result means
Compare the reserve with what you actually spend each year and adjust the per-km figures. Older vehicles usually need a higher routine cost per km than new ones.
Assumptions and limits
- Costs scale with distance and stay at today’s prices.
- All vehicles run a similar distance and have similar costs.
- Inflation, accident damage and warranty cover are not modelled; use the contingency for them.
Questions
Why spread tyres and overhauls per km?
They wear with use. Charging them per km builds the money up before the bill arrives instead of hitting one month.
What contingency should I use?
It depends on fleet age and your history; compare past budgets with actual spend to choose one.
Please note: This calculator gives estimates for planning. It is not financial advice, and lenders’ actual terms, fees and rounding may differ.