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Mercedes GLB vs Porsche Boxster comparison

Compare performance (354 HP vs 500 HP), boot space and price (43,200 £ vs 136,000 £ ) at a glance. Find out which car is the better choice for you – Mercedes GLB or Porsche Boxster?

Mercedes GLB vs Porsche Boxster: Key differences

Mercedes GLB

3.6 (4 Reviews)
rate
  • considerably cheaper
  • clearly more efficient
  • significantly more trunk space
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Porsche Boxster

  • clearly more power
  • significantly quicker 0–100 km/h
  • clearly lighter
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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

GLB

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 GLB is considerably cheaper – starting at 43,200 £ , while the Porsche Boxster costs 136,000 £ . That’s a price difference of around 92,831 £.

Fuel consumption also shows a difference: the Mercedes GLB uses 5.7 L/100km and is clearly more efficient than the Porsche Boxster with 12.7 L/100km. The difference is about 7 L/100km.

Boxster

Engine and Performance:

Under the bonnet, it becomes clear which model is tuned for sportiness and which one takes the lead when you hit the accelerator.

When it comes to engine power, the Porsche Boxster offers clearly more power – delivering 500 HP compared to 354 HP. That’s roughly 146 HP more horsepower.

When accelerating from 0 to 100 km/h, the Porsche Boxster is significantly quicker – completing the sprint in 3.4 s, while the Mercedes GLB takes 5.5 s. That’s about 2.1 s quicker.

There’s also a difference in torque: the Mercedes GLB delivers somewhat more torque with 515 Nm compared to 450 Nm. That’s about 65 Nm more.

GLB

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 2.

In terms of curb weight, Porsche Boxster is clearly lighter – 1,485 kg compared to 1,840 kg. The difference is around 355 kg.

Looking at boot space, the Mercedes GLB offers significantly more boot space – 540 L compared to 122 L. That’s a difference of about 418 L.

When it comes to payload, the Mercedes GLB carries clearly more – 505 kg compared to 270 kg. That’s a difference of about 235 kg.

Who wins the race in the data check?

The Mercedes GLB is far ahead 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 £43,200
GLB

Mercedes GLB

  • Engine Type Electric, Full Hybrid
  • Transmission Automatic
  • Drive Type Rear-Wheel Drive, All-Wheel Drive
  • Power HP 156 - 354 HP
  • Consumption L/100km 5.7 - 6.1 L/100km
  • Consumption kWh/100km 15.4 - 15.9 kWh/100km
  • Electric Range 431 - 631 km
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

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

Porsche Boxster

The Porsche Boxster epitomizes the essence of a pure, open-top driving experience with its mid-engine roadster design. Known for its agile handling and dynamic performance, the Boxster seamlessly blends luxury with thrilling precision on the road. Its unmistakable styling and superior engineering continue to captivate automotive enthusiasts who crave a visceral connection to the art of driving.

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Reviews Porsche Boxster

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

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Porsche Boxster

Costs and Consumption
Price
43,200 - 62,400 £
Price
136,000 £
Consumption L/100km
5.7 - 6.1 L/100km
Consumption L/100km
12.7 L/100km
Consumption kWh/100km
15.4 - 15.9 kWh/100km
Consumption kWh/100km
-
Electric Range
431 - 631 km
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
0 - 138 g/km
co2
288 g/km
Fuel tank capacity
-
Fuel tank capacity
54 L

Dimensions and Body
Body Type
SUV
Body Type
Roadster
Seats
5
Seats
2
Doors
-
Doors
2
Curb weight
1,840 - 2,280 kg
Curb weight
1,485 kg
Trunk capacity
540 L
Trunk capacity
122 L
Length
-
Length
4,418 mm
Width
1,861 mm
Width
1,822 mm
Height
-
Height
1,252 mm
Max trunk capacity
-
Max trunk capacity
-
Payload
485 - 505 kg
Payload
270 kg

Engine and Performance
Engine Type
Electric, Full Hybrid
Engine Type
Petrol
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Reduction Gearbox
Transmission Detail
Dual-Clutch Automatic
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Drive Type
Rear-Wheel Drive
Power HP
156 - 354 HP
Power HP
500 HP
Acceleration 0-100km/h
5.5 - 9.7 s
Acceleration 0-100km/h
3.4 s
Max Speed
-
Max Speed
308 km/h
Torque
280 - 515 Nm
Torque
450 Nm
Number of Cylinders
4
Number of Cylinders
6
Power kW
115 - 260 kW
Power kW
368 kW
Engine capacity
1,499 cm3
Engine capacity
3,996 cm3

General
Model Year
2026
Model Year
2023
CO2 Efficiency Class
A, D, E
CO2 Efficiency Class
G
Brand
Mercedes-Benz
Brand
Porsche
What drive types are available for the Mercedes GLB?

Available configurations include 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.