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BMW 7 Series vs Mercedes B Class comparison

Compare performance (571 HP vs 238 HP), boot space and price (102,800 £ vs 33,100 £ ) at a glance. Find out which car is the better choice for you – BMW 7 Series or Mercedes B Class?

BMW 7 Series vs Mercedes B Class: Key differences

BMW 7 Series

  • considerably more power
  • clearly more efficient
  • considerably quicker 0–100 km/h
  • slightly more trunk space
details

Mercedes B Class

4.9 (5 Reviews)
rate
  • significantly cheaper
  • clearly lighter
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

7 Series

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 significantly cheaper – starting at 33,100 £ , while the BMW 7 Series costs 102,800 £ . That’s a price difference of around 69,642 £.

Fuel consumption also shows a difference: the BMW 7 Series uses 3.3 L/100km and is clearly more efficient than the Mercedes B Class with 5.1 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 7 Series offers considerably more power – delivering 571 HP compared to 238 HP. That’s roughly 333 HP more horsepower.

When accelerating from 0 to 100 km/h, the BMW 7 Series is considerably quicker – completing the sprint in 4.3 s, while the Mercedes B Class takes 6.5 s. That’s about 2.2 s quicker.

There’s also a difference in torque: the BMW 7 Series delivers substantially more torque with 800 Nm compared to 400 Nm. That’s about 400 Nm more.

7 Series

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.

Both vehicles offer seating for 5 people.

In terms of curb weight, Mercedes B Class is clearly lighter – 1,405 kg compared to 2,255 kg. The difference is around 850 kg.

Looking at boot space, the BMW 7 Series offers slightly more boot space – 540 L compared to 455 L. That’s a difference of about 85 L.

When it comes to payload, the BMW 7 Series carries somewhat more – 665 kg compared to 550 kg. That’s a difference of about 115 kg.

Who wins the race in the data check?

The BMW 7 Series is clearly superior overall 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 £102,800
7 Series

BMW 7 Series

  • Engine Type Diesel MHEV, Plugin Hybrid
  • Transmission Automatic
  • Drive Type All-Wheel Drive
  • Power HP 300 - 571 HP
  • Consumption L/100km 3.3 - 6.1 L/100km
  • Electric Range 80 km
details

Frequently compared as well

Mercedes B Class
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BMW 7 Series
Mercedes B Class

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

BMW 7 Series

The BMW 7 Series is a flagship that balances whisper-quiet luxury with a driver's focus, wrapping advanced tech and plush comfort in a sleek, authoritative presence. It’s the kind of car that navigates city traffic and open roads with equal poise, offering a grown-up alternative for buyers who demand refinement without losing a little driving fun.

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Reviews BMW 7 Series

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 7 Series
Mercedes B Class

Costs and Consumption
Price
102,800 - 128,700 £
Price
33,100 - 52,500 £
Consumption L/100km
3.3 - 6.1 L/100km
Consumption L/100km
5.1 - 6.9 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
80 km
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
74 - 160 g/km
co2
133 - 156 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Sedan
Body Type
MPV
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
2,255 - 2,525 kg
Curb weight
1,405 - 1,565 kg
Trunk capacity
525 - 540 L
Trunk capacity
445 - 455 L
Length
-
Length
-
Width
1,950 mm
Width
1,796 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
605 - 665 kg
Payload
515 - 550 kg

Engine and Performance
Engine Type
Diesel MHEV, Plugin Hybrid
Engine Type
Petrol MHEV, Diesel
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
All-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
300 - 571 HP
Power HP
116 - 238 HP
Acceleration 0-100km/h
4.3 - 5.8 s
Acceleration 0-100km/h
6.5 - 10 s
Max Speed
-
Max Speed
-
Torque
670 - 800 Nm
Torque
200 - 400 Nm
Number of Cylinders
6
Number of Cylinders
4
Power kW
220 - 420 kW
Power kW
85 - 175 kW
Engine capacity
2,993 - 2,998 cm3
Engine capacity
1,332 - 1,991 cm3

General
Model Year
2,024 - 2,025
Model Year
2025
CO2 Efficiency Class
F, B
CO2 Efficiency Class
D, E, F
Brand
BMW
Brand
Mercedes-Benz
What drive types are available for the BMW 7 Series?

Available configurations include 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.