Fuel Cost Calculator
Quickly estimate trip cost using distance, fuel economy, and fuel price.
Field explanations
Enter the total planned trip distance. You can switch between kilometers (km) and miles (mi); we convert internally.
Distance unit. Choose kilometers (km) or miles (mi). This only affects input; results are adjusted automatically.
What is “fuel economy”? It’s how much fuel your vehicle uses per distance. Two common systems: (a) L/100 km — lower is better. (b) miles per gallon (mpg) — higher is better. How to get it: from your car’s trip computer, owner’s manual, manufacturer website, or by measuring manually: L/100 km = (liters added ÷ km driven) × 100; mpg = miles driven ÷ gallons added. Typical values: sedans 5–12 L/100 km (20–40 mpg), SUVs 8–16 L/100 km (15–30 mpg). Actual values vary with speed, terrain, load, tires, and AC use.
Measurement system of the number you entered above: either L/100 km or mpg (US). Pick the one that matches your value so conversions are correct.
Enter your local fuel price. If you select “per liter”, enter price per liter; if “per gallon”, enter price per US gallon (1 US gal = 3.78541 L).
Whether your price is per liter or per US gallon. The calculator adapts automatically.
Enable this if you’re returning on the same route. The calculator doubles distance and cost.
Optional: total people sharing the cost to show cost per person.
Currency symbol or code as you want it to appear in results (e.g., $, SAR, AED). This does not affect calculations.
Fuel Cost Calculator
This calculator estimates the total cost of a car trip using your distance, fuel economy, and fuel price. It supports common metrics like L/100 km and miles per gallon (mpg), one‑way or round‑trip, and optional cost per passenger.
How to use
- Enter the distance and choose km or miles.
- Enter your vehicle’s fuel economy: either L/100 km or mpg (US).
- Enter the fuel price per liter or per gallon.
- Toggle round trip if you’re going both ways.
- Optionally enter passengers to see cost per person.
Formulas
- L/100 km: Fuel needed (L) = distance (km) × L/100 km ÷ 100.
- mpg: Fuel needed (gal) = distance (mi) ÷ mpg.
- Total cost = fuel amount × fuel price.
- Cost per 100 km uses your economy: with L/100 km it’s value × price; with mpg we convert 100 km to miles, compute gallons, then multiply by price.
- Cost per person = total cost ÷ passengers.
Example
Distance = 250 km, economy = 7.5 L/100 km, fuel price = 1.8 per liter. Fuel ≈ 18.75 L, total cost ≈ 33.75, and cost per 100 km = 7.5 × 1.8 = 13.5.
Units and conversions
- 1 US gallon = 3.78541 liters.
- 1 mile = 1.609344 km.
- Results are approximate and rounded for readability.
Calculations use: 1 US gallon = 3.78541 liters. Nothing is sent to a server.