How is this calculated?
L/100 km = (liters used / kilometers driven) * 100 km/L = kilometers driven / liters used Adjusted consumption = measured or spec consumption * (1 + adjustment %) CNG support uses kilograms as the entered fuel unit
Example: a loaded truck that uses 330 liters over 900 km consumes 36.67 L/100 km and returns 2.73 km/L. With a 15% real-world adjustment, plan for 42.17 L/100 km.
How do I use this calculator?
- Choose the unit or currency setting that matches your vehicle data.
- Enter the required vehicle, route, fuel, weight or loan values in the calculator form.
- Review inline warnings and correct any missing or negative inputs.
- Read the live result card for the primary answer and supporting totals.
- Use the worked example if you want to check the formula with sample values.
- Copy, share or print the results for comparison or record keeping.
What do the terms mean?
- L/100 km
- Fuel used to travel 100 km; lower is better.
- km/L
- Distance traveled per liter or equivalent fuel unit.
- CNG
- Compressed natural gas, often recorded by kilogram.
- Loaded
- Vehicle operating with passenger or cargo load.
- Real-world adjustment
- Extra consumption allowance for traffic, weather, idle time and terrain.
What are real-world examples?
| Scenario | Inputs | Result | Notes |
|---|---|---|---|
| Loaded semi | 330 L / 900 km | 36.7 L/100 km | 2.73 km/L |
| Empty semi | 250 L / 900 km | 27.8 L/100 km | 3.60 km/L |
| City bus | 220 L / 450 km | 48.9 L/100 km | Stop-and-go |
| School bus | 95 L / 320 km | 29.7 L/100 km | Mixed route |
What tips improve accuracy?
- Measure fuel over repeated routes to separate traffic from vehicle condition.
- Loaded semis commonly run around 30 to 40 L/100 km; city buses can be 35 to 55 L/100 km.
- Idle time can dominate city bus and vocational truck consumption.
- Use CNG kilograms consistently; do not mix kg and liters in the same run.
- Apply 10% to 25% adjustment when converting lab or brochure figures to real routes.
- Track loaded and empty separately for better dispatch pricing.
Did you know? EPA estimates commonly use 8.89 kg CO2 per gallon of gasoline and 10.18 kg CO2 per gallon of diesel for tailpipe carbon dioxide calculations.
Related calculators
Frequently asked questions
Is this calculator free to use?
Yes. The calculator runs in your browser, does not require an account and can be printed or copied for your records.
Can I use this for official tax, loan or compliance filing?
Use it as an estimate. For official filing, financing or enforcement decisions, verify the final numbers with your lender, tax authority, manufacturer rating label or compliance professional.
Why are my real-world results different?
Real vehicles vary with load, speed, terrain, temperature, tire condition, maintenance, driver behavior and measurement quality.
Does the calculator save my units?
Yes. Unit and currency selections that are marked as preferences are stored in localStorage on your device so the next visit starts with your preferred setting.
Can I share the result?
Yes. Use the Share button if your browser supports native sharing, or copy the permalink and result summary.
Does it work on mobile?
Yes. The layout stacks on small screens, keeps labels visible and recalculates as you type.
How accurate are the formulas?
The formulas are standard industry math for estimates. Accuracy depends on the input values and whether the assumptions match your vehicle and jurisdiction.
When was this page updated?
This page was last updated on 2026-05-01 for 2026 planning assumptions and source links.