- Choose a mode: fuel consumption (L/100 km) or trip cost.
- Enter the distance in kilometers, the fuel used in liters and, for cost mode, the fuel price per liter.
- Read your consumption and the total cost instantly.
Everything is calculated locally in your browser. No data is uploaded, so you can check any route or vehicle freely.
Fuel is one of the largest running costs of any car, yet most drivers only discover their true consumption at the pump. Knowing your real liters-per-100-km figure lets you compare cars honestly, spot a sudden increase that may signal a maintenance issue, and estimate any journey’s cost before you leave — whether it is a daily commute, a holiday road trip or a delivery route.
Tips
Measure consumption over a full tank, not a single trip. Fill up, drive as you normally would, and refill at the same station; divide the refill liters by the distance traveled for an accurate average that smooths out daily variation.
Track a few tanks over time to spot trends. A creeping rise in L/100 km often precedes engine, tire or sensor problems, making this calculator a cheap early-warning tool. For trip budgets, check current fuel prices before setting off, then lock in your route with a realistic estimate.
Why use it
Most people guess their fuel economy from a dashboard reading, which can be optimistic, or from the painful surprise at the pump. Spreadsheet math and phone calculators are slow, and most fuel apps bury the simple answer behind registration walls.
This tool gives you the two numbers that matter — liters per 100 km and total trip cost — in seconds, with no ads and no sign-up. Enter three values, and you know exactly what the road ahead costs.
Real-world use cases
- Home buying: Estimate monthly payment and total interest before talking to a bank. Adjust years vs. rate to see the trade-off.
- Budgeting: Use percentage and discount calculators to quickly check sale prices while shopping.
- Planning: Workday and unit converters save time when coordinating across teams and regions.
How accurate is it?
Results use standard formulas with double-precision floats, matching Excel and banking calculators to within cents. Assumptions are shown in the note (e.g., monthly compounding). For legally binding totals, confirm with the provider because fees, insurance and rounding rules differ.
Pro tips
- For loans, compare equal-payment vs equal-principal: the latter starts higher but pays less interest overall.
- For fuel and discount math, keep one decimal extra while comparing options, then round for display.
- Save results with a screenshot or copy; everything is local so refreshing clears the form.