21 MPG (UK) to L/100km

21 MPG (UK) = 13.5 L/100km

21 MPG (UK)=13.5 L/100km
21 MPG (UK)=17.5 MPG (US)
21 MPG (UK)=7.43 km/L

How to Convert MPG (UK) to L/100km

The conversion is inverse: since MPG measures distance per unit of fuel and L/100km measures fuel per unit of distance, the formula is a division, not a multiplication.

  • L/100km = 282.48094 ÷ MPG (UK)

Applying the formula to 21 MPG (UK): 282.481 ÷ 21 = 13.5 L/100km.

Is 21 MPG (UK) good?

21 MPG (UK) is considered Below average — large SUV or older vehicle. In metric terms, this equals 13.5 L/100km (European labels) or 7.43 km/L (used in India, Japan, Brazil). In US terms, 21 MPG (UK) = 17.5 MPG (US).

Need a different value? Use our MPG (UK) to L/100km Converter.

Similar Conversions

MPG (UK)L/100kmkm/L
16 MPG 17.7 5.66
17 MPG 16.6 6.02
18 MPG 15.7 6.37
19 MPG 14.9 6.73
20 MPG 14.1 7.08
22 MPG 12.8 7.79
23 MPG 12.3 8.14
24 MPG 11.8 8.50
25 MPG 11.3 8.85
26 MPG 10.9 9.20

Related Fuel Economy Converters

L/100km to MPG (UK)

Reverse conversion: liters per 100 km to Imperial miles per gallon.

MPG (UK) to km/L

Imperial miles per gallon to kilometers per liter.

MPG (US) to L/100km

US miles per gallon to liters per 100 km.

MPG Calculator

Calculate your car’s MPG from distance and fuel used.
Conversion factors verified against NIST, BIPM Based on SI definitions (BIPM). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes