Fuel Cost Calculator Calculators
Work out what a journey costs in fuel, and split it between passengers.
Fuel Cost Calculator is a free online tool that work out what a journey costs in fuel, and split it between passengers. It runs entirely in your web browser using plain JavaScript, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free — no account, no quota, no watermark
- Category
- Calculators
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Technology
- plain JavaScript
- Settings
- 8
- Works offline
- Yes, after the first visit
About Fuel Cost Calculator
The economy units are not interchangeable, and mixing them is the usual source of wrong answers: L/100km gets better as it falls, while MPG gets better as it rises. A US gallon is 3.785 liters and an imperial gallon is 4.546, which is why UK cars appear roughly 20% more efficient than identical US ones on paper.
How to use it
- Enter distance, distance unit and fuel economy.
- Adjust the remaining 5 settings if the defaults do not fit your case.
The 8 settings
| Setting | What it does | Default |
|---|---|---|
| Distance | A numeric value. | 300 |
| Distance unit | Choose from 2: Kilometers, Miles. | Kilometers |
| Fuel economy | A numeric value. | 7.5 |
| Economy unit | Choose from 4: L / 100 km, MPG (US), MPG (imperial), km / L. | L / 100 km |
| Fuel price per liter/gallon | A numeric value. | 1.5 |
| Split between | Range 1–50. | 1 |
| Return journey | On or off. Off by default. | Off |
| Currency | Choose from 7: USD $, GBP £, EUR €, INR ₹, AUD A$, CAD C$…. | USD $ |
Under the hood
| Runs on | plain JavaScript — runs the whole thing |
| Controls | Distance, Distance unit, Fuel economy, Economy unit, Fuel price per liter/gallon, Split between, Return journey, Currency |
Questions
Why is my real economy worse than the manufacturer figure?
Official figures come from standardized lab cycles. Real-world consumption is typically 10–25% higher, more in cold weather, city driving or with a roof box.
What does the economy unit option change?
It offers 4 choices — L / 100 km, MPG (US), MPG (imperial) and km / L. The default is L / 100 km, which suits most cases; change it when your input or your destination calls for something specific.
What are the limits on split between?
It accepts 1 to 50, starting at 1.
Is the arithmetic exact?
It uses double-precision floating point — about 15 significant figures, far more than the inputs justify. Displayed rounding is cosmetic; the underlying numbers are not rounded between steps, so chained results do not drift.