Fuel Economy Calculator
Enter each fill-up — distance, volume, optional cost — and the tool computes economy and cost per km instantly. Records are saved automatically so you always see running averages.
How to Use
Enter the distance (km), fuel volume (L), and optionally the total cost. Date defaults to today. Click "Add" to save.
Each entry shows fuel economy (km/L) and cost per km. More distance per liter = better economy.
All-time average, last-5 average, total distance, and total cost update automatically. Export as CSV for spreadsheet analysis.
FAQ
How is fuel economy calculated?
Economy = distance (km) / fuel (L). e.g., 500 km / 40 L = 12.5 km/L. Each entry is computed automatically.
How is the running average computed?
All-time average = total distance / total fuel — a weighted average that's more accurate than averaging per-entry numbers. Last-5 average uses only the most recent 5 entries.
Can I skip the cost field?
Yes — cost is optional. Without it, cost-per-km and total cost are skipped, but economy still works.
My records disappeared
Records live in localStorage, so they're cleared by "Clear browsing data" or private/incognito mode. Export to CSV regularly to keep a copy.
Is anything sent to a server?
No. All calculations and storage stay in your browser; nothing leaves the page.
