Fuel Range Calculator

How to estimate range from fuel

1. Enter the fuel currently available and its unit. Do not enter full tank capacity if that is not the amount available.
2. Enter a known consumption or fuel-economy figure and choose its exact unit. US and Imperial mpg use different gallons.
3. To keep some fuel aside, open the optional section, enable it and enter that amount in the same fuel unit. If it was already excluded from your fuel amount, leave this option off.
4. Read the planning-distance estimate in kilometres or miles. Check the fuel included in the calculation and the assumptions before copying the result.

Useful choices without a trip-planning dashboard

• Two basic quantities: available fuel and a known consumption rate.
• Litres, US liquid gallons and Imperial gallons are explicitly distinguished.
• L/100 km, km/L and both common mpg definitions are supported independently of the fuel unit.
• An optional amount to hold back is subtracted exactly once.
• One kilometre or mile result, clear small-value rounding and a copyable explanation of the inputs.

When to use this calculator

• Estimate a planning distance from a known fuel amount and a representative consumption figure.
• Compare how holding back different fuel amounts changes the modeled distance, without receiving a prescribed reserve.
• Check the inverse of a trip-fuel calculation: available fuel to distance rather than distance to required fuel.

Available fuel, consumption and a chosen reserve

Available fuel means the quantity you can allocate before the optional reserve in this calculator. A nominal tank capacity is not automatically current fuel, and a gauge percentage is not a precise volume measurement.

A rate in L/100 km is fuel consumed for a fixed distance, so a higher figure means less range for the same fuel. km/L and mpg are distance per fuel quantity; higher figures mean more modeled range.

US liquid gallons and Imperial gallons are not interchangeable. Match each measurement's own unit. A US liquid gallon is exactly 3.785411784 L, an Imperial gallon is 4.54609 L, and a mile is exactly 1.609344 km.

If enabled, the reserve is an amount you choose to exclude, not extra hidden fuel or an officially recommended margin. Both fuel fields share one volume unit. Do not subtract the same reserve before entry and again in this option.

Changing an input unit leaves its number unchanged and reinterprets it. Update that number to match your source measurement. Changing the result between kilometres and miles converts the same unrounded modeled distance instead.

The arithmetic uses the entered decimals and exact unit factors. No nominal vehicle consumption, driving-style factor, live traffic, route, tank shape or refuelling database is supplied.

Worked range examples

40 L at 8 L/100 km gives 40 × 100 ÷ 8 = 500 km, with no additional reserve subtracted.

40 L with 5 L kept aside leaves 35 L. At 7 L/100 km, the modeled range is 500 km.

20 L at 10 km/L gives 200 km. This rate multiplies fuel rather than dividing it.

10 US gallons at 30 mpg US gives 300 miles. 10 Imperial gallons at 30 mpg Imperial also gives 300 miles; do not mix those gallon definitions.

Keeping all 40 L aside leaves no fuel allocated to this estimate, so it shows 0 km. Entering a reserve above 40 L is an input error, not a negative range.

A planning model, not a distance-to-empty promise

Actual consumption can change with speed, temperature, traffic, terrain, load and other conditions. A representative past or published rate does not guarantee future range.

This result is not a safe maximum driving distance, a dashboard calibration or an assurance that you can reach a fuel station. The calculator does not determine a suitable reserve for you.

Fuel and an enabled reserve may be zero; consumption must be greater than zero. Each number is limited to 1,000,000 selected units and 3 decimal places. These software bounds are not typical or recommended vehicle values.

The distance rounds to at most 1 decimal place, only at the end. About marks rounding, not a confidence interval. A positive value below 0.1 of the selected unit never becomes a misleading zero.

This page does not infer usable fuel from a warning light or tank gauge, calculate a route, price fuel, evaluate destination reachability, or estimate electric, aviation or marine range.

Your values and privacy

The calculator performs its arithmetic in your browser and does not intentionally upload or save your entered values or put them into the page URL. Copy result includes the summary only when you ask for it.

The surrounding website may still use analytics, advertising and consent services. Browser-side calculation is not a claim of whole-site offline operation or independently certified vendor privacy.