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Mercedes B Class vs BMW 3 Series Saloon comparison

Compare performance (238 HP vs 530 HP), boot space and price (33,100 £ vs 39,900 £ ) at a glance. Find out which car is the better choice for you – Mercedes B Class or BMW 3 Series Saloon?

Mercedes B Class vs BMW 3 Series Saloon: Key differences

Mercedes B Class

4.9 (5 Reviews)
rate
  • clearly cheaper
  • slightly lighter
details

BMW 3 Series Saloon

  • considerably more power
  • substantially more efficient
  • considerably quicker 0–100 km/h
  • only slightly 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

B Class

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 clearly cheaper – starting at 33,100 £ , while the BMW 3 Series Saloon costs 39,900 £ . That’s a price difference of around 6,813 £.

Fuel consumption also shows a difference: the BMW 3 Series Saloon uses 2.4 L/100km and is substantially more efficient than the Mercedes B Class with 5.1 L/100km. The difference is about 2.7 L/100km.

3 Series Saloon

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 3 Series Saloon offers considerably 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 3 Series Saloon is considerably quicker – completing the sprint in 3.5 s, while the Mercedes B Class takes 6.5 s. That’s about 3 s quicker.

There’s also a difference in torque: the BMW 3 Series Saloon delivers significantly more torque with 700 Nm compared to 400 Nm. That’s about 300 Nm more.

B Class

Space and Everyday Use:

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

Both vehicles offer seating for 5 people.

In terms of curb weight, Mercedes B Class is slightly lighter – 1,405 kg compared to 1,575 kg. The difference is around 170 kg.

Looking at boot space, the BMW 3 Series Saloon offers only slightly more boot space – 480 L compared to 455 L. That’s a difference of about 25 L.

When it comes to payload, the Mercedes B Class carries barely more – 550 kg compared to 495 kg. That’s a difference of about 55 kg.

Who wins the race in the data check?

The BMW 3 Series Saloon holds a decisive 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 £39,900
3 Series Saloon

BMW 3 Series Saloon

  • Engine Type : Diesel MHEV, Petrol, Petrol MHEV, Plugin Hybrid
  • Transmission : Automatic, Manuel
  • Drive Type : Rear-Wheel Drive, All-Wheel Drive
  • Power HP : 150 - 530 HP
  • Consumption L/100km : 2.4 - 10.1 L/100km
  • Electric Range : 96 - 101 km
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View detailed analysis

Engine and Performance
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View detailed analysis

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

BMW 3 Series Saloon

The BMW 3 Series saloon is a driver's car in a suit, blending poised handling with a cabin that feels more premium than its practicality suggests. It’s composed enough for daily duties yet playful enough to keep weekend drives interesting, making it a sensible choice for buyers who still want to have fun.

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Reviews BMW 3 Series Saloon

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

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Mercedes B Class
BMW 3 Series Saloon

Costs and Consumption
Price
33,100 - 52,500 £
Price
39,900 - 91,000 £
Consumption L/100km
5.1 - 6.9 L/100km
Consumption L/100km
2.4 - 10.1 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
96 - 101 km
Battery Capacity
-
Battery Capacity
-
co2
133 - 156 g/km
co2
54 - 227 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
MPV
Body Type
Sedan
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,405 - 1,565 kg
Curb weight
1,575 - 1,960 kg
Trunk capacity
445 - 455 L
Trunk capacity
375 - 480 L
Length
-
Length
-
Width
1,796 mm
Width
1,827 - 1,903 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
515 - 550 kg
Payload
405 - 495 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel
Engine Type
Diesel MHEV, Petrol, Petrol MHEV, Plugin Hybrid
Transmission
Automatic
Transmission
Automatic, Manuel
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Automatic Gearbox, Manual Gearbox
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
116 - 238 HP
Power HP
150 - 530 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
3.5 - 8.6 s
Max Speed
-
Max Speed
-
Torque
200 - 400 Nm
Torque
250 - 700 Nm
Number of Cylinders
4
Number of Cylinders
4 - 6
Power kW
85 - 175 kW
Power kW
110 - 390 kW
Engine capacity
1,332 - 1,991 cm3
Engine capacity
1,995 - 2,998 cm3

General
Model Year
2025
Model Year
2,024 - 2,025
CO2 Efficiency Class
D, E, F
CO2 Efficiency Class
D, E, F, G, B
Brand
Mercedes-Benz
Brand
BMW
What drivetrain options does the Mercedes B Class have?

Available configurations include Front-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.