MPG & Fuel Efficiency Calculator — Free Online Calculator & Guide
Calculate MPG from miles driven and fuel used, estimate trip fuel costs, determine driving range, or convert between MPG and L/100km.
✓ Formula verified: May 2026
MPG Calculator
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Fuel Economy
28.00 MPG
In Liters per 100 km
8.40 L/100km
Kilometers per Liter
11.90 km/L
What if your miles driven changes? 315 miles → 25.20 MPG · 350 miles → 28.00 MPG · 385 miles → 30.80 MPG
Scenario Comparison
Conservative (5%)
$16,470.09
$6,470.09 interest
Your scenario (7%)
$20,096.61
$10,096.61 interest
Aggressive (10%)
$27,070.41
$17,070.41 interest
High-risk (14%)
$40,224.71
$30,224.71 interest
Best return
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Fuel Economy
MPGFair
28.00 MPG
03060
L/100km8.40 L/100km
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