Gas Mileage Calculator
Find out what your vehicle truly burns. Enter odometer start/end (or a trip distance) plus the gallons it took to refill and the pump price to get MPG, L/100km, cost per mile and total fuel cost — with a trip-cost projection table.
TheCalculators — Gas Mileage Calculator
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Fuel Economy
24.6 mpg
290 mi on 11.8 gal · 9.6 L/100km
- Distance
- 290 mi (180.2 km)
- Fuel Used
- 11.8 gal (44.7 L)
- Fuel Price
- $3.45/gal
- Miles per Gallon
- 24.6
- Liters / 100 km
- 9.6
- Kilometers per Liter
- 10.45
- Total Fuel Cost
- $40.71
- Cost per Mile
- $0.140
- Cost per Kilometer
- $0.087
The math
- 1Distance traveled12,690 − 12,400 = 290 mi
- 2Divide by fuel290 ÷ 11.8 gal = 24.58 mpg
- 3Metric conversionL/100km = 235.215 ÷ mpg = 9.57
- 4Cost per mile$3.45 ÷ 24.58 = $0.140
Trip cost projection
Projection uses your measured economy and fuel price.
For accurate results, use the brim-full method: fill the tank, drive your trip, then refill to the same point and record gallons. US gallon figures are not comparable with imperial-gallon (UK) mpg ratings.
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Formula
MPG = distance ÷ fuel gallons · L/100km = 235.215 ÷ MPG · cost/mile = price ÷ MPG
Pro tips
- • Measure over at least 200 miles — short trips amplify rounding errors.
- • Aggressive acceleration and >60 mph highway speeds can cut economy 15–30%.
FAQ
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