Gas Mileage (MPG) Calculator
Instantly compute your vehicle’s fuel economy in MPG, L/100km, and km/L. Enter your distance and fuel used, optionally add fuel price to estimate cost per mile/km and trip cost.
Calculator
About This MPG Calculator
This lightweight, privacy‑friendly tool helps drivers and fleet managers quickly calculate fuel economy. Enter the distance you drove and the fuel you used; we’ll instantly convert and show MPG, L/100km, and km/L. You can also add fuel price to see your cost per mile/km and estimate trip cost for upcoming journeys.
How It Works
- MPG = miles driven ÷ gallons used.
- km/L = kilometers driven ÷ liters used.
- L/100km = 100 ÷ (km/L).
- We auto‑convert between miles↔kilometers and gallons↔liters for you.
Where & When to Use
- After refueling: note your trip mileage and the amount you filled.
- Comparing vehicles: check efficiency differences between cars or driving styles.
- Budgeting trips: estimate fuel needed and total cost for road trips or commutes.
- Maintenance checks: track MPG over time to spot tire, filter, or engine issues.
Tips to Improve Gas Mileage
- Maintain proper tire pressure and remove excess cargo weight.
- Use gentle acceleration, anticipate traffic, and stick to steady speeds.
- Combine short trips and avoid idling when possible.
- Keep up with engine air filter and oil changes per your manual.
FAQ
Q: Does this work for both US and metric units?
A: Yes — choose miles or kilometers, and gallons or liters. The results update across all three formats.
Q: Can I estimate a trip’s fuel cost?
A: Enter your fuel price and planned distance. We compute fuel needed and total cost.
Q: Is my data stored?
A: No. Everything runs in your browser; nothing is uploaded.