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BMW 4 Series Convertible vs Mercedes GLB comparison

Compare performance (530 HP vs 354 HP), boot space and price (52,600 £ vs 43,200 £ ) at a glance. Find out which car is the better choice for you – BMW 4 Series Convertible or Mercedes GLB?

BMW 4 Series Convertible vs Mercedes GLB: Key differences

BMW 4 Series Convertible

  • markedly more power
  • very slightly more efficient
  • clearly quicker 0–100 km/h
  • barely lighter
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Mercedes GLB

3.6 (4 Reviews)
rate
  • clearly cheaper
  • clearly more trunk space
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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:

Looking at overall running costs, both models reveal some interesting differences in everyday economy.

Mercedes GLB is clearly cheaper – starting at 43,200 £ , while the BMW 4 Series Convertible costs 52,600 £ . That’s a price difference of around 9,431 £.

Fuel consumption also shows a difference: the BMW 4 Series Convertible uses 5.2 L/100km and is very slightly more efficient than the Mercedes GLB with 5.7 L/100km. The difference is about 0.5 L/100km.

GLB

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 markedly more power – delivering 530 HP compared to 354 HP. That’s roughly 176 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 GLB takes 5.5 s. That’s about 1.8 s quicker.

There’s also a difference in torque: the BMW 4 Series Convertible delivers markedly more torque with 700 Nm compared to 515 Nm. That’s about 185 Nm more.

4 Series Convertible

Space and Everyday Use:

Beyond pure performance, interior space and usability matter most in daily life. This is where you see which car is more practical and versatile.

Seats: Mercedes GLB offers more seats – 5 vs 4.

In terms of curb weight, BMW 4 Series Convertible is barely lighter – 1,765 kg compared to 1,840 kg. The difference is around 75 kg.

Looking at boot space, the Mercedes GLB offers clearly more boot space – 540 L compared to 385 L. That’s a difference of about 155 L.

When it comes to payload, the Mercedes GLB carries moderately more – 505 kg compared to 420 kg. That’s a difference of about 85 kg.

Who wins the race in the data check?

The BMW 4 Series Convertible stands out in the key areas 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
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View detailed analysis

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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 GLB

The Mercedes GLB is a compact luxury SUV that blends smart packaging with a polished, composed driving experience. Its flexible interior and premium feel make it a sensible pick for buyers who want Mercedes comfort and practicality in a smaller footprint.

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Reviews Mercedes GLB

3.6 (4 Reviews)
rate
Hans
19 Feb 2026, 02:39:00

Great car — very satisfied with the GLB 250 4MATIC.

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

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Mercedes GLB

Costs and Consumption
Price
52,600 - 97,800 £
Price
43,200 - 62,400 £
Consumption L/100km
5.2 - 10.2 L/100km
Consumption L/100km
5.7 - 6.1 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
15.4 - 15.9 kWh/100km
Electric Range
-
Electric Range
431 - 631 km
Battery Capacity
-
Battery Capacity
-
co2
136 - 231 g/km
co2
0 - 138 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Convertible
Body Type
SUV
Seats
4
Seats
5
Doors
-
Doors
-
Curb weight
1,765 - 2,055 kg
Curb weight
1,840 - 2,280 kg
Trunk capacity
385 L
Trunk capacity
540 L
Length
-
Length
-
Width
1,852 - 1,887 mm
Width
1,861 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
345 - 420 kg
Payload
485 - 505 kg

Engine and Performance
Engine Type
Diesel MHEV, Petrol, Petrol MHEV
Engine Type
Electric, Full Hybrid
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Reduction Gearbox
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
184 - 530 HP
Power HP
156 - 354 HP
Acceleration 0-100km/h
3.7 - 8.2 s
Acceleration 0-100km/h
5.5 - 9.7 s
Max Speed
-
Max Speed
-
Torque
300 - 700 Nm
Torque
280 - 515 Nm
Number of Cylinders
4 - 6
Number of Cylinders
4
Power kW
135 - 390 kW
Power kW
115 - 260 kW
Engine capacity
1,995 - 2,998 cm3
Engine capacity
1,499 cm3

General
Model Year
2,024 - 2,025
Model Year
2026
CO2 Efficiency Class
E, F, G
CO2 Efficiency Class
A, D, E
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.