What does a fleet tire cost calculator show?
Tires are a running cost that grows with every kilometer. This fleet tire cost calculator turns tire price, fitting cost and expected tire life into a cost per kilometer for each vehicle, the number of tires the fleet needs a year and the yearly tire budget.
Two more tabs help with decisions. Compare tires sets two options side by side, with or without retreading, and shows the cost per 1,000 km and the yearly difference. Pressure & alignment puts a figure on the tire life lost when some tires run underinflated or vehicles are out of alignment, using assumptions you set.
Why track tire cost per kilometer?
- Price alone misleads. A cheaper tire that wears out sooner can cost more per kilometer than a more expensive one that lasts longer.
- Budgets follow distance. Tire spend rises with the kilometers the fleet runs, so a cost per km lets you rebuild the budget when routes or fleet size change.
- Purchases can be planned. Knowing how many tires the fleet uses a year helps you plan orders and workshop slots instead of buying in a hurry.
- Tire care shows in the numbers. Pressure and alignment affect how long tires last. Putting a cost on lost life helps you judge whether regular checks are worth the time.
What data do you need for the calculator?
| Input | Where to find it | Tip |
|---|---|---|
| Tire price and fitting cost | Supplier invoices or your contract price list | Include balancing, valves and disposal if you pay for them per tire. |
| Expected tire life | Your removal records by tire model | Use the average distance at removal, not the best case. Without records, start from supplier guidance and update it. |
| Tread depth and wear | Tread depth readings at inspections | Wear per 1,000 km = depth lost ÷ km between two readings × 1,000. |
| Distance per vehicle per month | Odometer readings, trip reports or fleet reports | Use a 3 to 6 month average to smooth out busy and quiet months. |
| Share of tires underinflated | Pressure check records | Count the tires found below the recommended pressure at a check. |
How is tire cost per km calculated?
Cost per km and yearly budget
Tire life from tread depth
The removal depth is the depth at which you replace the tire. Set it from your fleet policy and the legal minimum that applies to your vehicles.
Comparing two tires
Tire-km per year = Vehicles × Tires per vehicle × Km per vehicle per year.
Cost of lost tire life
A tire that loses 15% of its life must be replaced 1 ÷ 0.85 = 1.18 times as often, so it costs about 18% more per kilometer. The calculator applies this to the share you enter for low pressure and, separately, for misalignment.
Worked example: tire budget for 20 trucks
A fleet runs 20 trucks with 6 tires each, and each truck covers 6,000 km a month. A tire costs 800 and fitting and balancing cost 50, so each fitted tire costs 850. Expected life is 80,000 km. These are example values.
- Cost per km per truck = 6 × 850 ÷ 80,000 = 0.064 per km, or 10.63 per tire per 1,000 km.
- Each truck runs 72,000 km a year and uses 6 × 72,000 ÷ 80,000 = 5.4 tires, so the fleet needs 20 × 5.4 = 108 tires a year.
- Yearly tire budget = 108 × 850 = 91,800, or 4,590 per truck. Each truck needs a new set about every 13 months.
- Using tread depth instead: 16 mm new, replaced at 3 mm, with wear of 0.15 mm per 1,000 km gives (16 − 3) ÷ 0.15 × 1,000 = about 86,667 km.
- Compare: option A costs 800 and lasts 80,000 km, or 10.63 per 1,000 km. Option B costs 1,100 and lasts 100,000 km, then takes one retread at 350 that adds 60,000 km: (1,100 + 50 + 350 + 50) ÷ 160,000 × 1,000 = 9.69 per 1,000 km. Over 8,640,000 tire-km a year, B saves about 8,100 a year and needs 54 new tires instead of 108.
- Pressure and alignment: if 20% of tires run underinflated and lose an assumed 15% of their life, and 10% of vehicles are out of alignment with an assumed 10% loss, lost life costs 91,800 × 0.20 × 0.15 ÷ 0.85 + 91,800 × 0.10 × 0.10 ÷ 0.90 = 3,240 + 1,020 = 4,260 a year, about 5 extra tires.
How to read your tire cost results
- Cost per km per vehicle is the figure to compare across vehicle types, routes and tire models. Track it every quarter.
- Tires needed per year is an average. Tires are bought in sets, so some months will be heavier than others.
- Yearly saving in the compare tab holds only if the life figures hold. Test them on part of the fleet first.
- Cost of lost life depends on the assumptions you set. Use it to judge whether regular pressure and alignment checks are worth the time, not as a forecast.
Common mistakes in tire cost planning
- Comparing purchase price only. Compare cost per 1,000 km, including fitting and any retread.
- Using the best-case life. Your roads, loads and heat decide the real life. Use your own removal records when you have them.
- Mixing wheel positions. Steer, drive and trailer tires wear at different rates. Run the calculator for each position or tire model when the gap is large.
- Ignoring fitting and downtime. Each change costs labor and vehicle time, not just the tire.
- Counting retreads without checking casings. Not every casing can be retreaded. Base the number of retreads on what your casings actually pass.
Assumptions and limits
Results are estimates based on the values entered. Default values are examples only, not market prices or benchmarks. The calculator assumes all tires on a vehicle wear at the same rate and that distance is spread evenly over the year. The pressure and alignment tab uses life reductions you set. It does not model fuel use, safety or damage from punctures and road hazards, and it adds the two effects separately, so tires affected by both are counted twice. Removal depth and tire choice must follow the rules that apply to your vehicles and your tire supplier's guidance.