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BMW Z4 vs Mercedes B Class comparison

Compare performance (340 HP vs 238 HP), boot space and price (43,500 £ vs 33,100 £ ) at a glance. Find out which car is the better choice for you – BMW Z4 or Mercedes B Class?

BMW Z4 vs Mercedes B Class: Key differences

BMW Z4

4.4 (1 Reviews)
rate
  • clearly more power
  • considerably quicker 0–100 km/h
details

Mercedes B Class

4.9 (6 Reviews)
rate
  • clearly cheaper
  • markedly more efficient
  • marginally lighter
  • noticeably 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.

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

Z4

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 Z4 costs 43,500 £ . That’s a price difference of around 10,328 £.

Fuel consumption also shows a difference: the Mercedes B Class uses 5.1 L/100km and is markedly more efficient than the BMW Z4 with 6.9 L/100km. The difference is about 1.8 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 Z4 offers clearly more power – delivering 340 HP compared to 238 HP. That’s roughly 102 HP more horsepower.

When accelerating from 0 to 100 km/h, the BMW Z4 is considerably quicker – completing the sprint in 4.5 s, while the Mercedes B Class takes 6.5 s. That’s about 2 s quicker.

There’s also a difference in torque: the BMW Z4 delivers slightly more torque with 500 Nm compared to 400 Nm. That’s about 100 Nm more.

Z4

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 2.

In terms of curb weight, Mercedes B Class is marginally lighter – 1,405 kg compared to 1,510 kg. The difference is around 105 kg.

Looking at boot space, the Mercedes B Class offers noticeably more boot space – 455 L compared to 281 L. That’s a difference of about 174 L.

When it comes to payload, the Mercedes B Class carries clearly more – 550 kg compared to 235 kg. That’s a difference of about 315 kg.

Who wins the race in the data check?

The Mercedes B Class holds a solid overall lead 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
Mercedes GLA
VS
The Mercedes B‑Class and Mercedes GLA target buyers who want Mercedes practicality with premium touches, but they take different paths: the B‑Class is a spacious, hatchback-style people carrier while the GLA is a compact crossover with a higher ride height and sportier stance. This comparison looks …
BMW 2 Series Active Tourer
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BMW Z4
Mercedes B Class

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

BMW Z4

The BMW Z4 is a taut, road-hugging roadster that pairs elegant, low-slung styling with a roof you can drop on a sunny whim, delivering that pure, wind-in-your-hair driving thrill few cars manage to match. It’s an ideal weekend companion for drivers who prefer engagement over practicality — bring good shoes rather than a lot of luggage, and you’ll get a grin every time you turn the wheel.

details
P90479448_highRes_bmw-z4-m40i-09-2022
P90479454_highRes_bmw-z4-m40i-09-2022
P90479457_highRes_bmw-z4-m40i-09-2022
P90479470_highRes_bmw-z4-m40i-09-2022
P90479471_highRes_bmw-z4-m40i-09-2022

Reviews BMW Z4

4.4 (1 Reviews)
rate
Maingard
26 Apr 2026, 13:19:10

Responsive car, very high-performing, very agile in corners.

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

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.

details
18C0947_011
18C0947_009
18C0953_005
18C0953_035
18C0947_044

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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VS
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Skoda Kamiq
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BMW Z4
Mercedes B Class

Costs and Consumption
Price
43,500 - 65,300 £
Price
33,100 - 52,500 £
Consumption L/100km
6.9 - 8.5 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
157 - 191 g/km
co2
133 - 156 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Roadster
Body Type
MPV
Seats
2
Seats
5
Doors
-
Doors
-
Curb weight
1,510 - 1,640 kg
Curb weight
1,405 - 1,565 kg
Trunk capacity
281 L
Trunk capacity
445 - 455 L
Length
-
Length
-
Width
1,864 mm
Width
1,796 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
215 - 235 kg
Payload
515 - 550 kg

Engine and Performance
Engine Type
Petrol
Engine Type
Petrol MHEV, Diesel
Transmission
Manual, Automatic
Transmission
Automatic
Transmission Detail
Manual Gearbox, Automatic Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
Rear-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
197 - 340 HP
Power HP
116 - 238 HP
Acceleration 0-100km/h
4.5 - 6.8 s
Acceleration 0-100km/h
6.5 - 10 s
Max Speed
-
Max Speed
-
Torque
320 - 500 Nm
Torque
200 - 400 Nm
Number of Cylinders
4 - 6
Number of Cylinders
4
Power kW
145 - 250 kW
Power kW
85 - 175 kW
Engine capacity
1,998 - 2,998 cm3
Engine capacity
1,332 - 1,991 cm3

General
Model Year
2,025 - 2,026
Model Year
2025
CO2 Efficiency Class
F, G
CO2 Efficiency Class
D, E, F
Brand
BMW
Brand
Mercedes-Benz
Is the BMW Z4 offered with different drivetrains?

The BMW Z4 is available as 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.