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Audi A3 Sportback vs Mercedes GLB comparison

Compare performance (400 HP vs 354 HP), boot space and price (27,000 £ vs 43,200 £ ) at a glance. Find out which car is the better choice for you – Audi A3 Sportback or Mercedes GLB?

Audi A3 Sportback vs Mercedes GLB: Key differences

Audi A3 Sportback

4.1 (2 Reviews)
rate
  • considerably cheaper
  • moderately more power
  • significantly more efficient
  • clearly quicker 0–100 km/h
  • markedly lighter
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Mercedes GLB

3.6 (4 Reviews)
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  • clearly more electric range
  • visibly 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

A3 Sportback

Costs and Efficiency:

Price and efficiency are key factors when choosing a car – and this is often where the real differences emerge.

Audi A3 Sportback is considerably cheaper – starting at 27,000 £ , while the Mercedes GLB costs 43,200 £ . That’s a price difference of around 16,197 £.

Fuel consumption also shows a difference: the Audi A3 Sportback uses 1.1 L/100km and is significantly more efficient than the Mercedes GLB with 5.7 L/100km. The difference is about 4.6 L/100km.

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.

GLB

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 Audi A3 Sportback offers moderately 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 clearly 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 marginally more torque with 515 Nm compared to 500 Nm. That’s about 15 Nm more.

A3 Sportback

Space and Everyday Use:

Whether family car or daily driver – which one offers more room, flexibility and comfort?

Both vehicles offer seating for 5 people.

In terms of curb weight, Audi A3 Sportback is markedly lighter – 1,360 kg compared to 1,840 kg. The difference is around 480 kg.

Looking at boot space, the Mercedes GLB offers visibly 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 – 505 kg compared to 480 kg. That’s a difference of about 25 kg.

Who wins the race in the data check?

The Audi A3 Sportback 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 £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
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Audi A3 Sportback
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

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View detailed analysis

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

4.1 (2 Reviews)
rate

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

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)
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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

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Audi A3 Sportback
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Costs and Consumption
Price
27,000 - 92,900 £
Price
43,200 - 62,400 £
Consumption L/100km
1.1 - 9.3 L/100km
Consumption L/100km
5.7 - 6.1 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
15.4 - 15.9 kWh/100km
Electric Range
134 - 141 km
Electric Range
431 - 631 km
Battery Capacity
-
Battery Capacity
-
co2
25 - 211 g/km
co2
0 - 138 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Hatchback
Body Type
SUV
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,360 - 1,685 kg
Curb weight
1,840 - 2,280 kg
Trunk capacity
280 - 380 L
Trunk capacity
540 L
Length
-
Length
-
Width
1,816 - 1,851 mm
Width
1,861 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
410 - 480 kg
Payload
485 - 505 kg

Engine and Performance
Engine Type
Petrol, Petrol MHEV, Diesel, Plugin Hybrid
Engine Type
Electric, Full Hybrid
Transmission
Manuel, Automatic
Transmission
Automatic
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Transmission Detail
Reduction Gearbox
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
116 - 400 HP
Power HP
156 - 354 HP
Acceleration 0-100km/h
3.8 - 10.1 s
Acceleration 0-100km/h
5.5 - 9.7 s
Max Speed
-
Max Speed
-
Torque
220 - 500 Nm
Torque
280 - 515 Nm
Number of Cylinders
4 - 5
Number of Cylinders
4
Power kW
85 - 294 kW
Power kW
115 - 260 kW
Engine capacity
1,498 - 2,480 cm3
Engine capacity
1,499 cm3

General
Model Year
2,025 - 2,026
Model Year
2026
CO2 Efficiency Class
D, F, E, G, B
CO2 Efficiency Class
A, D, E
Brand
Audi
Brand
Mercedes-Benz
What drive types are available for the Audi A3 Sportback?

The Audi A3 Sportback is available as 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.