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BMW 8 Series Convertible vs Mercedes B Class comparison

Compare performance (625 HP vs 238 HP), boot space and price (99,400 £ vs 33,100 £ ) at a glance. Find out which car is the better choice for you – BMW 8 Series Convertible or Mercedes B Class?

BMW 8 Series Convertible vs Mercedes B Class: Key differences

BMW 8 Series Convertible

  • significantly more power
  • substantially quicker 0–100 km/h
details

Mercedes B Class

4.9 (5 Reviews)
rate
  • substantially cheaper
  • markedly more efficient
  • visibly lighter
  • visibly 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

8 Series Convertible

Costs and Efficiency:

Price and efficiency are key factors when choosing a car – and this is often where the real differences emerge.

Mercedes B Class is substantially cheaper – starting at 33,100 £ , while the BMW 8 Series Convertible costs 99,400 £ . That’s a price difference of around 66,299 £.

Fuel consumption also shows a difference: the Mercedes B Class uses 5.1 L/100km and is markedly more efficient than the BMW 8 Series Convertible with 6.9 L/100km. The difference is about 1.8 L/100km.

B Class

Engine and Performance:

Power, torque and acceleration say a lot about how a car feels on the road. This is where you see which model delivers more driving dynamics.

When it comes to engine power, the BMW 8 Series Convertible offers significantly more power – delivering 625 HP compared to 238 HP. That’s roughly 387 HP more horsepower.

When accelerating from 0 to 100 km/h, the BMW 8 Series Convertible is substantially quicker – completing the sprint in 3.3 s, while the Mercedes B Class takes 6.5 s. That’s about 3.2 s quicker.

There’s also a difference in torque: the BMW 8 Series Convertible delivers significantly more torque with 750 Nm compared to 400 Nm. That’s about 350 Nm more.

8 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 B Class offers more seats – 5 vs 4.

In terms of curb weight, Mercedes B Class is visibly lighter – 1,405 kg compared to 1,915 kg. The difference is around 510 kg.

Looking at boot space, the Mercedes B Class offers visibly more boot space – 455 L compared to 350 L. That’s a difference of about 105 L.

When it comes to payload, the Mercedes B Class carries noticeably more – 550 kg compared to 425 kg. That’s a difference of about 125 kg.

Who wins the race in the data check?

The Mercedes B Class holds a slight edge 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 £33,100
B Class

Mercedes B Class

  • Engine Type Petrol MHEV, Diesel
  • Transmission Automatic
  • Drive Type Front-Wheel Drive, All-Wheel Drive
  • Power HP 116 - 238 HP
  • Consumption L/100km 5.1 - 6.9 L/100km
details

Frequently compared as well

Mercedes B Class
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BMW 8 Series Convertible
Mercedes B Class

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

BMW 8 Series Convertible

The BMW 8 Series Convertible is a head-turning grand tourer that drops its roof with the kind of theatrical flourish you expect from a modern Bavarian showboat. It wraps occupants in sumptuous materials and driver-focused polish, offering effortless long-distance comfort and just enough drama to make every arrival feel like an occasion.

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Reviews BMW 8 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 (5 Reviews)
rate
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 8 Series Convertible
Mercedes B Class

Costs and Consumption
Price
99,400 - 165,800 £
Price
33,100 - 52,500 £
Consumption L/100km
6.9 - 11.2 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
180 - 255 g/km
co2
133 - 156 g/km
Fuel tank capacity
66 - 68 L
Fuel tank capacity
-

Dimensions and Body
Body Type
Convertible
Body Type
MPV
Seats
4
Seats
5
Doors
2
Doors
-
Curb weight
1,915 - 2,125 kg
Curb weight
1,405 - 1,565 kg
Trunk capacity
350 L
Trunk capacity
445 - 455 L
Length
4,851 - 4,867 mm
Length
-
Width
1,902 - 1,907 mm
Width
1,796 mm
Height
1,345 - 1,353 mm
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
340 - 425 kg
Payload
515 - 550 kg

Engine and Performance
Engine Type
Diesel MHEV, Petrol
Engine Type
Petrol MHEV, Diesel
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
All-Wheel Drive, Rear-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
333 - 625 HP
Power HP
116 - 238 HP
Acceleration 0-100km/h
3.3 - 5.5 s
Acceleration 0-100km/h
6.5 - 10 s
Max Speed
250 km/h
Max Speed
-
Torque
500 - 750 Nm
Torque
200 - 400 Nm
Number of Cylinders
6 - 8
Number of Cylinders
4
Power kW
245 - 460 kW
Power kW
85 - 175 kW
Engine capacity
2,993 - 4,395 cm3
Engine capacity
1,332 - 1,991 cm3

General
Model Year
2024
Model Year
2025
CO2 Efficiency Class
G
CO2 Efficiency Class
D, E, F
Brand
BMW
Brand
Mercedes-Benz
What drivetrain options does the BMW 8 Series Convertible have?

Available configurations include All-Wheel Drive or Rear-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.