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BMW 4 Series Convertible vs Mercedes B Class comparison

Compare performance (530 HP vs 238 HP), boot space and price (52,600 £ vs 33,100 £ ) at a glance. Find out which car is the better choice for you – BMW 4 Series Convertible or Mercedes B Class?

BMW 4 Series Convertible vs Mercedes B Class: Key differences

BMW 4 Series Convertible

  • clearly more power
  • clearly quicker 0–100 km/h
details

Mercedes B Class

4.9 (6 Reviews)
rate
  • clearly cheaper
  • barely more efficient
  • noticeably lighter
  • a bit more trunk space
details

All details on performance, efficiency, range and trunk space can be found in the technical comparison below – including user reviews for both models.

By Achim Sedelmaier

Here’s where it gets real: The technical differences in detail

4 Series Convertible

Costs and Efficiency:

When it comes to price and running costs, the biggest differences usually appear. This is often where you see which car fits your budget better in the long run.

Mercedes B Class is clearly cheaper – starting at 33,100 £ , while the BMW 4 Series Convertible costs 52,600 £ . That’s a price difference of around 19,499 £.

Fuel consumption also shows a difference: the Mercedes B Class uses 5.1 L/100km and is barely more efficient than the BMW 4 Series Convertible with 5.2 L/100km. The difference is about 0.1 L/100km.

B Class

Engine and Performance:

Power, torque and acceleration are the classic benchmarks for car enthusiasts – and here, some clear differences start to show.

When it comes to engine power, the BMW 4 Series Convertible offers clearly more power – delivering 530 HP compared to 238 HP. That’s roughly 292 HP more horsepower.

When accelerating from 0 to 100 km/h, the BMW 4 Series Convertible is clearly quicker – completing the sprint in 3.7 s, while the Mercedes B Class takes 6.5 s. That’s about 2.8 s quicker.

There’s also a difference in torque: the BMW 4 Series Convertible delivers considerably more torque with 700 Nm compared to 400 Nm. That’s about 300 Nm more.

4 Series Convertible

Space and Everyday Use:

Cabin size, boot volume and payload all play a role in everyday practicality. Here, comfort and flexibility make the difference.

Seats: Mercedes B Class offers more seats – 5 vs 4.

In terms of curb weight, Mercedes B Class is noticeably lighter – 1,405 kg compared to 1,765 kg. The difference is around 360 kg.

Looking at boot space, the Mercedes B Class offers a bit more boot space – 455 L compared to 385 L. That’s a difference of about 70 L.

When it comes to payload, the Mercedes B Class carries markedly more – 550 kg compared to 420 kg. That’s a difference of about 130 kg.

Who wins the race in the data check?

The BMW 4 Series Convertible stands well ahead of its rival in the objective data comparison.
This result only shows which model scores more points on paper – not which of the two cars feels right for you.

from £52,600
4 Series Convertible

BMW 4 Series Convertible

  • Engine Type Diesel MHEV, Petrol, Petrol MHEV
  • Transmission Automatic
  • Drive Type Rear-Wheel Drive, All-Wheel Drive
  • Power HP 184 - 530 HP
  • Consumption L/100km 5.2 - 10.2 L/100km
details

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BMW 4 Series Convertible
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

BMW 4 Series Convertible

The BMW 4 Series Convertible blends coupe-like elegance with open-top drama, its sleek profile and distinctive grille demanding attention whether the roof’s up or down. Behind the wheel it serves up taut handling and a refined ride, making it a rewarding choice for drivers who want sporty character without sacrificing everyday comfort — and yes, it looks spectacular when you drop the top.

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Reviews BMW 4 Series Convertible

No reviews yet. Share your experience and help others decide.

Mercedes B Class

The Mercedes B-Class is a smart, grown-up compact people carrier that dresses everyday practicality in a near‑premium polish, perfect for buyers who want comfort and a classy badge without the theatrics. It won’t set your pulse racing on a back road, but it will make school runs, commutes and grocery hauls feel pleasantly civilized — a reliable, slightly posh companion for real life.

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Reviews Mercedes B Class

4.9 (6 Reviews)
rate
SiBa
31 Jul 2026, 14:51:34

We've been driving only the B180D automatic for 9 years — there's nothing better. Great on long trips; the next one will be another B180D automatic.

How do you mainly use this car? (optional): Family car
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Safety
Practicality / Trunk & Everyday Use
Value for Money
Peter
5 Mar 2026, 05:51:19

My wife and I have been driving a Mercedes W247 200d for seven years now, with 93,000 km on the clock. The car is very comfortable even on long trips and economical. At the last service the pads of the electric parking brake were replaced; otherwise no repairs. We love this car.

How do you mainly use this car? (optional): Family car
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money

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BMW 4 Series Convertible
Mercedes B Class

Costs and Consumption
Price
52,600 - 97,800 £
Price
33,100 - 52,500 £
Consumption L/100km
5.2 - 10.2 L/100km
Consumption L/100km
5.1 - 6.9 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
136 - 231 g/km
co2
133 - 156 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Convertible
Body Type
MPV
Seats
4
Seats
5
Doors
-
Doors
-
Curb weight
1,765 - 2,055 kg
Curb weight
1,405 - 1,565 kg
Trunk capacity
385 L
Trunk capacity
445 - 455 L
Length
-
Length
-
Width
1,852 - 1,887 mm
Width
1,796 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
345 - 420 kg
Payload
515 - 550 kg

Engine and Performance
Engine Type
Diesel MHEV, Petrol, Petrol MHEV
Engine Type
Petrol MHEV, Diesel
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
184 - 530 HP
Power HP
116 - 238 HP
Acceleration 0-100km/h
3.7 - 8.2 s
Acceleration 0-100km/h
6.5 - 10 s
Max Speed
-
Max Speed
-
Torque
300 - 700 Nm
Torque
200 - 400 Nm
Number of Cylinders
4 - 6
Number of Cylinders
4
Power kW
135 - 390 kW
Power kW
85 - 175 kW
Engine capacity
1,995 - 2,998 cm3
Engine capacity
1,332 - 1,991 cm3

General
Model Year
2,024 - 2,025
Model Year
2025
CO2 Efficiency Class
E, F, G
CO2 Efficiency Class
D, E, F
Brand
BMW
Brand
Mercedes-Benz
What drive types are available for the BMW 4 Series Convertible?

The BMW 4 Series Convertible is available as Rear-Wheel Drive or All-Wheel Drive.

DriveDuel uses data analysis and artificial intelligence to evaluate vehicle data and create content. Content is regularly reviewed and improved. The displayed prices are estimates based on German list prices, adjusted to the respective country’s VAT. Country-specific registration taxes are not included. This information is not legally binding.