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Calculate key data like fuel consumption per 100km (L/100km) and cost per kilometer based on your driving distance, fuel volume, and gas price.
Enter distance and fuel consumed to calculate
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This calculator uses metric distance in kilometres and fuel volume in litres. Enter the distance for one recorded interval and the litres consumed over that same interval. It returns two ways to express that ratio: litres per 100 kilometres (L/100 km) and kilometres per litre (km/L). L/100 km is a consumption measure, so a lower figure means less fuel used over the same distance; km/L is the inverse, so a higher figure means more distance per litre.
L/100 km = litres consumed ÷ kilometres driven × 100
km/L = kilometres driven ÷ litres consumed
Fuel cost per km = litres × entered price per litre ÷ kilometres
Total fuel cost = litres × entered price per litre
For 550 km and 45 L, the results are 8.18 L/100 km and 12.22 km/L. If the entered price is 8.50 per litre, the arithmetic gives 0.70 per km and 382.50 total. Results are displayed to two decimal places. The price field is optional: the two consumption ratios still calculate without it.
Natural Resources Canada explains that lower L/100 km ratings indicate lower fuel consumption, while real-world use can differ with weather, traffic, speed, vehicle condition and accessories. Its published vehicle ratings are standardized comparisons; this page instead calculates from the numbers you supply.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Use a distance and fuel quantity that describe the same period of driving. For a tank-to-tank log, note the odometer at a fill, then record the distance to the next comparable fill and the litres added at that second fill.
Put the interval distance in kilometres and the corresponding fuel quantity in litres. Both need to be nonzero for a result.
Enter the price per litre using the same currency unit as the price you want to analyze. The page displays a ¥ symbol for cost results; it does not look up fuel prices or convert currencies.
Results update from the entered values. The consumption cards show L/100 km and km/L; cost per kilometre and total cost appear only when a usable price is entered. Each numeric result can be copied.
Use cases
See how the tool fits into real work and everyday tasks.
Calculate separate intervals for city and highway driving, keeping the same units and recording method. A set of intervals gives a clearer picture than a single unusual trip.
When you already have a distance, fuel quantity and per-litre price, use the cost figures to check the arithmetic for that fuel amount. Keep receipts and the original trip record for any formal reimbursement.
Compare L/100 km for records measured with a consistent method. Use km/L when your notes are organized around distance achieved per litre; the two figures express the same relationship in opposite directions.
Q&A
Find concise answers to common questions and confusing cases.
The entries may cover a different interval, and a trip computer may estimate fuel use differently from a fill-up record. Compare records over matched intervals and several refills before drawing a conclusion.
Only if the litres entered represent fuel consumed over the exact distance entered. An ordinary top-up does not by itself reveal how much fuel was used since the previous reading; repeated fills to a consistent level make the interval easier to estimate.
L/100 km and km/L use only distance and fuel volume. The price is used only for the per-kilometre and total-cost calculations.
Notes
Review scope, result limitations, and important precautions before use.
This is arithmetic on your entries, not a certified vehicle rating, mechanical diagnosis or prediction of future fuel use.
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