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Mercedes GLB vs Audi A3 Sportback comparison

Compare performance (354 HP vs 400 HP), boot space and price (50,600 £ vs 27,000 £ ) at a glance. Find out which car is the better choice for you – Mercedes GLB or Audi A3 Sportback?

Mercedes GLB vs Audi A3 Sportback: Key differences

Mercedes GLB

3.2 (3 Reviews)
rate
  • clearly more electric range
  • clearly more trunk space

Audi A3 Sportback

3.9 (1 Reviews)
rate
  • clearly cheaper
  • somewhat more power
  • considerably quicker 0–100 km/h
  • considerably lighter

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

GLB

Costs and Efficiency:

Price and efficiency are often the first things buyers look at. Here it becomes clear which model has the long-term edge – whether at the pump, the plug, or in purchase price.

Audi A3 Sportback is clearly cheaper – starting at 27,000 £ , while the Mercedes GLB costs 50,600 £ . That’s a price difference of around 23,612 £.

As for electric range, the Mercedes GLB offers clearly more range – reaching up to 631 km, about 490 km more than the Audi A3 Sportback.

A3 Sportback

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 Audi A3 Sportback offers somewhat more power – delivering 400 HP compared to 354 HP. That’s roughly 46 HP more horsepower.

When accelerating from 0 to 100 km/h, the Audi A3 Sportback is considerably quicker – completing the sprint in 3.8 s, while the Mercedes GLB takes 5.5 s. That’s about 1.7 s quicker.

There’s also a difference in torque: the Mercedes GLB delivers very slightly more torque with 515 Nm compared to 500 Nm. That’s about 15 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.

Both vehicles offer seating for 5 people.

In terms of curb weight, Audi A3 Sportback is considerably lighter – 1,360 kg compared to 2,200 kg. The difference is around 840 kg.

Looking at boot space, the Mercedes GLB offers clearly more boot space – 540 L compared to 380 L. That’s a difference of about 160 L.

When it comes to payload, the Mercedes GLB carries marginally more – 500 kg compared to 480 kg. That’s a difference of about 20 kg.

Who wins the race in the data check?

The Audi A3 Sportback is barely ahead 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 £27,000
A3 Sportback

Audi A3 Sportback

  • Engine Type : Petrol, Petrol MHEV, Diesel, Plugin Hybrid
  • Transmission : Manuel, Automatic
  • Drive Type : Front-Wheel Drive, All-Wheel Drive
  • Power HP : 116 - 400 HP
  • Consumption L/100km : 1.1 - 9.3 L/100km
  • Electric Range : 134 - 141 km
details

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Audi A3 Sportback

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 practical compact SUV that mixes boxy, family-friendly space with premium German polish, making it an appealing choice for buyers who want usefulness without pretension. It drives with a confident, composed feel and somehow manages to look both rugged and refined — the grown-up SUV that still likes to have fun.

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Reviews Mercedes GLB

3.2 (3 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

Audi A3 Sportback

The Audi A3 Sportback wraps premium materials and crisp German design into a practical hatchback package that makes daily driving feel smart rather than showy. It’s nimble in the city, composed on longer trips, and carries just enough swagger to satisfy buyers who want quality without shouting about it.

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Reviews Audi A3 Sportback

3.9 (1 Reviews)
rate

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

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Mercedes GLB
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Costs and Consumption
Price
50,600 - 62,400 £
Price
27,000 - 56,600 £
Consumption L/100km
-
Consumption L/100km
1.1 - 9.3 L/100km
Consumption kWh/100km
15.8 - 15.9 kWh/100km
Consumption kWh/100km
-
Electric Range
614 - 631 km
Electric Range
134 - 141 km
Battery Capacity
-
Battery Capacity
19.7 kWh
co2
0 g/km
co2
25 - 211 g/km
Fuel tank capacity
-
Fuel tank capacity
40 L

Dimensions and Body
Body Type
SUV
Body Type
Hatchback
Seats
5
Seats
5
Doors
-
Doors
5
Curb weight
2,200 - 2,280 kg
Curb weight
1,360 - 1,685 kg
Trunk capacity
540 L
Trunk capacity
280 - 380 L
Length
-
Length
4,352 - 4,353 mm
Width
1,861 mm
Width
1,816 - 1,851 mm
Height
-
Height
1,441 - 1,470 mm
Max trunk capacity
-
Max trunk capacity
1,100 L
Payload
500 kg
Payload
410 - 480 kg

Engine and Performance
Engine Type
Electric
Engine Type
Petrol, Petrol MHEV, Diesel, Plugin Hybrid
Transmission
Automatic
Transmission
Manuel, Automatic
Transmission Detail
Reduction Gearbox
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
272 - 354 HP
Power HP
116 - 400 HP
Acceleration 0-100km/h
5.5 - 7.4 s
Acceleration 0-100km/h
3.8 - 10.1 s
Max Speed
-
Max Speed
225 - 237 km/h
Torque
335 - 515 Nm
Torque
220 - 500 Nm
Number of Cylinders
-
Number of Cylinders
4 - 5
Power kW
200 - 260 kW
Power kW
85 - 294 kW
Engine capacity
-
Engine capacity
1,498 - 2,480 cm3

General
Model Year
2,026
Model Year
2,025
CO2 Efficiency Class
A
CO2 Efficiency Class
D, F, E, G, B
Brand
Mercedes-Benz
Brand
Audi
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.