MPG ↔ L/100km Converter

Convert between MPG (US) and L/100km instantly

MPG (Miles per Gallon) US

US Miles per Gallon (higher is better)

L/100km (Liters per 100km)

Liters per 100 kilometers (lower is better)

Excellent

35+ MPG

6.7- L/100km

Average

20-35 MPG

6.7-11.8 L/100km

Poor

-20 MPG

11.8+ L/100km

Conversion Result

24 MPG = 9.8 L/100km

Fuel efficiency: Average • 1 gallon ≈ 3.785 liters

💡 Note: MPG and L/100km use opposite scales. Higher MPG means better fuel efficiency, while lower L/100km means better fuel efficiency.

📚 MPG ↔ L/100km Conversion Details

MPG to L/100km Formula

L/100km = 235.2145 ÷ MPG

To convert MPG to L/100km, divide 235.2145 by the MPG value.

L/100km to MPG Formula

MPG = 235.2145 ÷ L/100km

To convert L/100km to MPG, divide 235.2145 by the L/100km value.

Bidirectional Conversion

This converter works both ways simultaneously:

Type in MPG → L/100km updates automatically
Type in L/100km → MPG updates automatically
No buttons to click - works as you type

Common Uses

Car fuel efficiency comparison
International travel planning
Environmental impact assessment
Vehicle specifications comparison

⛽ How This Converter Works

This is a bidirectional converter for fuel efficiency measurements:

MPG → L/100km: When you type in the MPG field, the L/100km field automatically updates
L/100km → MPG: When you type in the L/100km field, the MPG field automatically updates
No swapping needed: Both conversions happen simultaneously
Real-time: Updates happen as you type, no button clicks required

// Conversion Constants:
1 US gallon = 3.785411784 liters
1 mile = 1.609344 kilometers

// Conversion Formula (derived):
L/100km = (100 × 3.785411784) ÷ (1.609344 × MPG)
L/100km = 235.2145833 ÷ MPG

// Example 1: 24 MPG
L/100km = 235.2145 ÷ 24 = 9.8

// Example 2: 8.5 L/100km
MPG = 235.2145 ÷ 8.5 = 27.7

📊 Fuel Efficiency Comparison Table

MPG (US)	L/100km	Efficiency Rating
10	23.5	Poor
15	15.7	Poor
20	11.8	Average
25	9.4	Average
30	7.8	Good
35	6.7	Excellent
40	5.9	Excellent

❓ Frequently Asked Questions

Q: Why are MPG and L/100km scales opposite?

A: MPG measures distance per unit fuel (higher is better), while L/100km measures fuel per distance (lower is better). They're inversely related.

Q: Is this for US MPG or UK MPG?

A: This converter uses US MPG (US gallons). UK MPG (Imperial gallons) is different. 1 US gallon = 0.832674 UK gallons.

Q: What's a good fuel efficiency rating?

A: 30+ MPG (7.8- L/100km) is good, 20-30 MPG (7.8-11.8 L/100km) is average, below 20 MPG (11.8+ L/100km) is poor.

Q: Why 235.2145 in the formula?

A: It's derived from the conversion factors: (100 × liters per gallon) ÷ (km per mile) = (100 × 3.785411784) ÷ 1.609344 = 235.2145833