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ToolBoxGenie

Mileage Calculator

Calculators · Added 18 August 2026

Find out what your vehicle actually returns, rather than what the brochure claims. Enter the distance covered and the fuel it took — or two odometer readings and a brim-to-brim fill — and get the figure in every unit that matters, along with the cost per kilometre and what that adds up to over a month.

How did you measure it?
km

Per litre.

For the range estimate.

km

Turns the cost per kilometre into a monthly and yearly fuel budget.

How to use the mileage calculator

  1. 1Choose whether you know the distance and fuel directly, or are measuring tank to tank.
  2. 2For tank to tank: fill to the brim, note the odometer, ride, then fill to the brim again and enter both readings and the fuel added.
  3. 3Enter the fuel used and pick the unit — litres, US gallons or imperial gallons.
  4. 4Optionally add the fuel price, your tank capacity and your usual monthly distance.
  5. 5Press Calculate to see km/l, mpg both ways, l/100km, range and running cost.

Examples

A commuter motorcycle

Input
320 km covered, 6.4 litres added at the next brim fill
Result
50.0 km/l · 117.6 mpg (US) · 141.2 mpg (UK) · 2.0 l/100km

A petrol hatchback with costs

Input
412 km, 28 litres, fuel at ₹105/l, 1,200 km a month
Result
14.71 km/l · ₹7.14 per km · about ₹8,570 a month in fuel

Odometer readings

Input
Odometer 14,250 then 14,570 km, 8.5 litres at the second fill
Result
320 km on 8.5 l — 37.6 km/l

Both fills must be to the brim. A partial second fill makes the figure meaningless.

About the mileage calculator

Why the measurement is worth taking

Fuel is the largest running cost of most vehicles, and it is the one that responds to how you use them. Knowing your real figure turns a vague sense that the bike 'feels thirsty' into a number you can act on, and it is the only way to tell whether a service, a new set of tyres or a change in riding style actually did anything.

It is also the first symptom of several mechanical problems. A sudden 15% drop in efficiency with no change in how you ride usually means something specific: a choke stuck partly on, a dragging brake, a clogged air filter, a failing oxygen sensor. Catching that from a mileage log is cheaper than catching it from a breakdown.

Getting a measurement worth having

Use the same pump at the same station where you can. Pump cut-off points vary, and on a small tank a difference of half a litre in where the nozzle clicks off is several percent of the reading.

Cover a reasonable distance — at least a full tank, ideally two — and note the conditions. A tank of pure highway riding and a tank of monsoon traffic are both true figures for what they measure, but averaging them tells you more about your commute than about the vehicle.

Keep the odometer readings rather than trusting a trip meter you might reset by accident. Odometer arithmetic is harder to get wrong, and it leaves a record you can go back to.

What the cost per kilometre is for

Cost per kilometre converts a mileage figure into the unit decisions are actually made in. It is what makes a fair comparison between two vehicles possible, what tells you whether a longer route on better roads is cheaper than a shorter one through traffic, and what a mileage reimbursement claim should be checked against.

It is worth remembering that fuel is not the whole running cost. Tyres, chain and sprockets, engine oil, brake pads and servicing all scale with distance too, and on a motorcycle they often add up to as much again as the fuel. A full cost per kilometre is the fuel figure roughly doubled — useful to know before concluding that a long commute is cheap.

Frequently asked questions

How is this different from the fuel cost calculator?
They run in opposite directions. The fuel cost calculator asks you for an efficiency figure and tells you what a trip will cost. This one treats efficiency as the unknown and measures it from what actually happened — the distance you covered and the fuel you actually put in. Use this first to find your real figure, then use that figure in the trip calculator.
What is the tank-to-tank method and why does it need a brim fill?
Most motorcycles have no usable fuel gauge, so the only reliable way to know how much fuel a ride consumed is to start and finish with the tank at exactly the same level. Fill to the brim, note the odometer, ride, then fill to the brim again: the fuel that goes in the second time is precisely what the ride used. If the second fill stops short, you are dividing your distance by less fuel than you actually burned and the mileage comes out flattering.
Why is the UK mpg figure higher than the US one for the same vehicle?
The gallons are different sizes. An imperial gallon is 4.546 litres and a US gallon is 3.785, so the same efficiency reads about 20% higher in imperial mpg. This is why comparing an American road test against a British one without checking which gallon is meant produces a nonsense conclusion. Both are shown here so there is no ambiguity.
Why does my mileage vary so much between tanks?
Because almost everything affects it. Stop-start city traffic can halve the figure a highway run produces. Tyre pressure 20% low costs several percent. So do a pillion, a full top box, a cold engine on short trips, air conditioning, and a heavy right hand. One tank is a noisy sample — average three or four consecutive tanks before drawing a conclusion about the vehicle itself.
Should I trust the manufacturer's claimed mileage?
Treat it as a laboratory number obtained under a standard test cycle, not a promise. Real-world figures 15–30% below the claim are normal, and the gap widens in heavy traffic or with a vehicle that is not fully run in. That gap is exactly what this calculator exists to measure.
Does l/100km being lower mean worse?
No — it is the one unit where lower is better. Litres per 100 km measures fuel consumed for a fixed distance, so a smaller number means less fuel. Kilometres per litre and miles per gallon measure distance covered per fixed fuel, so bigger is better. Mixing the two up is the most common misreading of a European spec sheet.

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