BMW 4 Series (2020) is 375 mm (14.76 inch) longer and 66 mm (2.60 inch) wider than Mercedes B-Class (2018).
Mercedes B-Class (2018) is 174 mm (6.85 inch) higher, 205 kg (452 lbs) lighter and has 46 liters (1.62 ft3) bigger cargo space than BMW 4 Series (2020).
Size difference at a glance
BMW 4 Series (2020) is 8.5% longer than Mercedes B-Class (2018).
BMW 4 Series (2020) is 3.7% wider than Mercedes B-Class (2018).
BMW 4 Series (2020) is 11.2% lower than Mercedes B-Class (2018).
BMW 4 Series (2020) is 14.7% heavier than Mercedes B-Class (2018).
BMW 4 Series (2020) is 9.5% smaller in cargo space than Mercedes B-Class (2018).
Overall footprint
BMW 4 Series (2020) has a 12.5% larger overall footprint (length × width).
