Motorcycle Fuel Range Calculator

How to Use the Motorcycle Fuel Range Calculator

Look up your bike to auto-fill tank size, or enter your own values. The calculator shows your total range on a full tank, how far you can ride before hitting reserve, and how far the reserve fuel will carry you. Always plan fuel stops at 80% of the calculated range.

The Formula Behind the Calculator

Fuel range is a straightforward division problem. With consumption expressed in litres per 100 km, the calculation is:

Range (km) = (usable fuel in litres ÷ consumption in L/100km) × 100

The only subtlety is what counts as "usable". Your total range uses the full tank capacity, but your range to reserve uses tank capacity minus the reserve volume — and that second number is the one that matters for planning, because hitting reserve on an empty stretch of road is the situation you are trying to avoid.

A Worked Example

Take a 15-litre tank with a 2.5-litre reserve, on a bike returning 5.5 L/100km:

• Full tank: 15 ÷ 5.5 × 100 = 273 km
• To reserve: 12.5 ÷ 5.5 × 100 = 227 km
• Reserve only: 2.5 ÷ 5.5 × 100 = 45 km

That reserve figure is worth committing to memory for your own bike. It is the distance you have to find fuel once the light comes on, and on most middleweight machines it is considerably shorter than riders assume.

Converting Between Consumption Units

Manufacturers publish economy figures in different units depending on market, which makes direct comparison awkward. To convert into L/100km:

• From km/L: L/100km = 100 ÷ km/L
• From US mpg: L/100km = 235.2 ÷ mpg
• From imperial (UK) mpg: L/100km = 282.5 ÷ mpg

The imperial and US gallon differ by roughly 20%, so a bike advertised at 60 mpg in the UK is about 50 mpg in US terms. Mixing the two is one of the most common sources of over-optimistic range planning.

Why Real-World Range Falls Short

The arithmetic is exact; the inputs are not. Manufacturer consumption figures come from standardised test cycles run at moderate, steady speeds in mild conditions, and real riding rarely resembles that. Aerodynamic drag rises with the square of speed, so sustained motorway pace punishes economy far more than riders expect — the difference between 90 km/h and 130 km/h can be 30% or more on a naked bike. Headwinds, luggage, pillion weight, cold air and short trips where the engine never reaches operating temperature all push consumption up.

Tank capacity is nominal rather than exact, too. The fuel pump sits in a well and cannot draw the last fraction of a litre, and how full a tank actually gets varies with how the bike is standing and whether you fill to the filler neck.

Tips for Maximising Range

Steady speeds between 80–100 km/h give the best fuel economy. High speeds, hard acceleration, cold weather and heavy luggage all increase consumption significantly. For long-distance touring, use your actual consumption from past rides rather than the manufacturer figure.

The reliable way to establish your real number is to brim the tank, ride normally, brim it again, then divide litres added by distance travelled. Repeat across two or three tanks of mixed riding and you will have a consumption figure worth planning around. Enter that here rather than the brochure number, and treat 80% of the result as your working range — the remaining 20% is the margin that covers a closed petrol station, a detour, or a headwind you did not plan for.