On this page

• The cost-per-kilometre formula
• A worked Australian example
• Fuel, rotations and the hidden costs
• How to estimate realistic tread life
• How to use it when you buy
• FAQ

The cost-per-kilometre formula

Comparing tyres on price alone is like comparing cars on the size of the fuel tank. The number that matters is what each tyre costs you for every kilometre it’s on the road:

Cost per km = Total fitted price ÷ Realistic tread life (km)

“Total fitted price” is the out-the-door cost — the tyre plus mounting, balancing, a new valve and the disposal levy — not the “from $X” sticker. If you’re not sure what should be in that figure, see what’s actually included in a tyre fitting price and our breakdown of fitting, balancing and valve costs. “Realistic tread life” is how far that tyre will actually go on your car and roads before it hits the legal 1.5mm minimum — usually well short of any marketing figure.

A worked Australian example

Take three sets of tyres for the same car. The numbers below are illustrative — use your own quotes and realistic life — but they show the pattern that plays out constantly in the real world.

The budget set has the cheapest sticker but the highest cost per kilometre — it’s the dearest tyre to own. The mid-tier set is the sweet spot here, and even the premium set undercuts the budget one over its life. That’s the whole point: the cheapest quote and the cheapest tyre are often not the same thing (we dig into that in why the cheapest quote isn’t always the cheapest tyre and premium vs budget tyres).

Fuel, rotations and the hidden costs

Tread life is the biggest lever, but two more costs belong in a proper comparison:

• Fuel (rolling resistance). A low-rolling-resistance tyre can cut fuel use by a few percent. Over 60,000 km at 8L/100km and $1.90/L, even a 3% saving is well over $250 — enough to tip a close comparison. See tyre pressure and fuel economy for how much is at stake.
• Rotations and alignment. Regular rotation and a correct alignment can add thousands of kilometres of even wear, lowering cost per km. A neglected alignment does the opposite. Budget a rotation every 10,000 km or so.
• Safety has a value too. A tyre that stops shorter in the wet isn’t just “nicer” — avoiding one crash dwarfs any per-km saving. Cost per km ranks tyres you’d actually trust, not the cheapest thing that’s road-legal.

How to estimate realistic tread life

The honest answer is that most tyres travel less than their headline mileage. To estimate realistically: start from independent wear tests (European lab tests and long-term reviews are a good guide), then discount for Australian conditions — heat, coarse-chip highways and load all shorten life. A tyre’s category matters more than its brand: touring and highway tyres last longest; all-terrains and performance tyres wear faster. Our guide to realistic kilometre expectations by tyre type gives ballpark ranges, and remember you replace at 1.5mm (grip drops well before that — many replace nearer 3mm for wet safety), not at the canvas.

How to use it when you buy

Turn every quote into a cost-per-km figure before you decide:

1. Get the fitted, out-the-door price for four from each store.
2. Estimate realistic tread life for each tyre on your car.
3. Divide price by life to get cost per km.
4. Nudge the winner for a fuel-efficient tyre and against a thirsty one.
5. Then chase a keener price on that tyre — time it to a sale or cashback, check whether a buy-3-get-1-free deal genuinely helps, and buy from a keenly priced retailer like Bob Jane T-Marts.

This is the reasoning behind our value verdicts elsewhere — the best value tyre brand right now, the Michelin vs Kumho premium-vs-value question, whether tyres under $150 a corner stack up, and the rotating cheap tyres vs one good set maths. All of them come back to this one number.

Bottom line: Divide the fitted price by realistic tread life and you’ll compare tyres the way they actually cost you money. Add fuel and rotations, respect safety, and the winner is rarely the cheapest sticker — it’s usually a mid-tier tyre that lasts. Cost per kilometre is the number every tyre decision should come back to.

Frequently asked questions

How do you calculate cost per kilometre for tyres?

Divide the total fitted price of the tyre (including mounting, balancing, valve and disposal) by the number of kilometres it will realistically last before reaching the 1.5mm legal minimum. A $250 fitted tyre that lasts 60,000 km costs about 0.42 cents per kilometre.

Why is a cheap tyre sometimes more expensive per kilometre?

Because it wears out sooner. If a budget tyre lasts half as long as a mid-tier one for two-thirds of the price, its cost per kilometre is higher — you replace it more often, and pay fitting again each time. Short tread life quietly erases the sticker saving.

Should I include fuel in the comparison?

Yes, if the tyres differ noticeably in rolling resistance. Fuel-efficient tyres can save a few percent, which over the life of a set can be worth hundreds of dollars — enough to change a close verdict. It matters most for high-kilometre drivers.

What tread life figure should I use?

Use a realistic figure, not the marketing mileage — most tyres travel less. Start from independent wear tests, then discount for Australian heat, coarse roads and your driving. Our tyre-life guide gives typical ranges by tyre type.

Prices and tread-life figures are illustrative guides as at 2026 and vary by tyre, vehicle and conditions. Independent tread-wear data: Tyre Reviews. Confirm current fitted prices with the retailer.