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Mercedes B Class vs Audi A3 Sportback comparison

Compare performance (238 HP vs 400 HP), boot space and price (33,100 £ vs 27,000 £ ) at a glance. Find out which car is the better choice for you – Mercedes B Class or Audi A3 Sportback?

Mercedes B Class vs Audi A3 Sportback: Key differences

Mercedes B Class

4.9 (5 Reviews)
rate
  • moderately more trunk space
details

Audi A3 Sportback

4.1 (2 Reviews)
rate
  • clearly cheaper
  • clearly more power
  • substantially more efficient
  • significantly quicker 0–100 km/h
  • only slightly 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

B Class

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 B Class costs 33,100 £ . That’s a price difference of around 6,129 £.

Fuel consumption also shows a difference: the Audi A3 Sportback uses 1.1 L/100km and is substantially more efficient than the Mercedes B Class with 5.1 L/100km. The difference is about 4 L/100km.

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 clearly more power – delivering 400 HP compared to 238 HP. That’s roughly 162 HP more horsepower.

When accelerating from 0 to 100 km/h, the Audi A3 Sportback is significantly quicker – completing the sprint in 3.8 s, while the Mercedes B Class takes 6.5 s. That’s about 2.7 s quicker.

There’s also a difference in torque: the Audi A3 Sportback delivers moderately more torque with 500 Nm compared to 400 Nm. That’s about 100 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, Audi A3 Sportback is only slightly lighter – 1,360 kg compared to 1,405 kg. The difference is around 45 kg.

Looking at boot space, the Mercedes B Class offers moderately more boot space – 455 L compared to 380 L. That’s a difference of about 75 L.

When it comes to payload, the Mercedes B Class carries somewhat more – 550 kg compared to 480 kg. That’s a difference of about 70 kg.

Who wins the race in the data check?

The Audi A3 Sportback 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 £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

Frequently compared as well

Mercedes B Class
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Mercedes A Class
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Mercedes B Class
Audi A3 Sportback

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
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

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.

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Mercedes B Class
Audi A3 Sportback

Costs and Consumption
Price
33,100 - 52,500 £
Price
27,000 - 92,900 £
Consumption L/100km
5.1 - 6.9 L/100km
Consumption L/100km
1.1 - 9.3 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
134 - 141 km
Battery Capacity
-
Battery Capacity
-
co2
133 - 156 g/km
co2
25 - 211 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
MPV
Body Type
Hatchback
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,405 - 1,565 kg
Curb weight
1,360 - 1,685 kg
Trunk capacity
445 - 455 L
Trunk capacity
280 - 380 L
Length
-
Length
-
Width
1,796 mm
Width
1,816 - 1,851 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
515 - 550 kg
Payload
410 - 480 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel
Engine Type
Petrol, Petrol MHEV, Diesel, Plugin Hybrid
Transmission
Automatic
Transmission
Manuel, Automatic
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Front-Wheel Drive, All-Wheel Drive
Power HP
116 - 238 HP
Power HP
116 - 400 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
3.8 - 10.1 s
Max Speed
-
Max Speed
-
Torque
200 - 400 Nm
Torque
220 - 500 Nm
Number of Cylinders
4
Number of Cylinders
4 - 5
Power kW
85 - 175 kW
Power kW
85 - 294 kW
Engine capacity
1,332 - 1,991 cm3
Engine capacity
1,498 - 2,480 cm3

General
Model Year
2025
Model Year
2,025 - 2,026
CO2 Efficiency Class
D, E, F
CO2 Efficiency Class
D, F, E, G, B
Brand
Mercedes-Benz
Brand
Audi
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.