@ Mercedes-Benz Group Media
@ smart Europe GmbH
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Mercedes B Class vs smart #3 – Which model is better for everyday use?

Compare performance, boot capacity, efficiency and price at a glance.
Find out which car is the better choice for you – Mercedes B Class or smart #3?

Mercedes B Class

5 (3 Reviews)
rate

smart #3

5 (1 Reviews)
rate

Here’s where it gets real: The technical differences in detail

B Class @ Mercedes-Benz Group Media

Costs and Efficiency:

Looking at overall running costs, both models reveal some interesting differences in everyday economy.

Mercedes B Class has a barely noticeable advantage in terms of price – it starts at 33100 £, while the smart #3 costs 34700 £. That’s a price difference of around 1576 £.

As for range, the smart #3 performs convincingly better – achieving up to 455 km, about 372 km more than the Mercedes B Class.

#3 @ smart Europe GmbH

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 smart #3 has a clearly edge – offering 428 HP compared to 238 HP. That’s roughly 190 HP more horsepower.

In acceleration from 0 to 100 km/h, the smart #3 is convincingly quicker – completing the sprint in 3.70 s, while the Mercedes B Class takes 6.50 s. That’s about 2.80 s faster.

In terms of top speed, the Mercedes B Class performs evident better – reaching 250 km/h, while the smart #3 tops out at 180 km/h. The difference is around 70 km/h.

There’s also a difference in torque: smart #3 pulls noticeable stronger with 584 Nm compared to 450 Nm. That’s about 134 Nm difference.

B Class @ Mercedes-Benz Group Media

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 curb weight, Mercedes B Class is noticeable lighter – 1405 kg compared to 1780 kg. The difference is around 375 kg.

In terms of boot space, the Mercedes B Class offers a bit more room – 455 L compared to 370 L. That’s a difference of about 85 L.

In maximum load capacity, the Mercedes B Class performs evident better – up to 1540 L, which is about 380 L more than the smart #3.

When it comes to payload, Mercedes B Class to a small extent takes the win – 550 kg compared to 450 kg. That’s a difference of about 100 kg.

Who wins the race?

The smart #3 proves to be is largely superior and therefore becomes our DriveDuel Champion!
smart #3 is the better all-rounder in this comparison.

Mercedes B Class
smart #3

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis
from about £34,700
#3 @ smart Europe GmbH

smart #3

  • Engine Type : Electric
  • Transmission : Automatic
  • Drive Type : Rear-Wheel Drive, All-Wheel Drive
  • Power HP : 272 - 428 HP
  • Consumption kWh/100km : 16.3 - 17.6 kWh
  • Electric Range : 325 - 455 km
details

Mercedes B Class

5 (3 Reviews)
rate

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.

details
18C0947_011 @ Mercedes-Benz Group Media
18C0947_009 @ Mercedes-Benz Group Media
18C0953_005 @ Mercedes-Benz Group Media
18C0953_035 @ Mercedes-Benz Group Media
18C0947_044 @ Mercedes-Benz Group Media

smart #3

5 (1 Reviews)
rate

The Smart #3 turns the brand's cheeky city-car attitude into a grown-up compact SUV, pairing sleek styling with a surprisingly roomy, well-made interior. It's a brilliant pick for buyers who want electric ease without dullness — practical enough for daily life, but still lively enough to make parking and grocery runs feel a little fun.

details
smart-hashtag3-brabus-photon-orange-exterior-mallorca1 @ smart Europe GmbH
smart-hashtag3-brabus-photon-orange-exterior-mallorca13 @ smart Europe GmbH
smart-hashtag3-brabus-photon-orange-exterior-mallorca21 @ smart Europe GmbH
smart-hashtag3-brabus-photon-orange-interior-mallorca10 @ smart Europe GmbH
smart-hashtag3-brabus-photon-orange-interior-mallorca3 @ smart Europe GmbH
smart-hashtag3-premium-ceramic-cream-interior-mallorca7 @ smart Europe GmbH

Reviews Mercedes B Class

5 (3 Reviews)
rate

Reviews smart #3

5 (1 Reviews)
rate

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B Class @ Mercedes-Benz Group Media
#3 @ smart Europe GmbH

Costs and Consumption
Price
33100 - 52500 £
Price
34700 - 45800 £
Consumption L/100km
2.5 - 6.9 L
Consumption L/100km
-
Consumption kWh/100km
-
Consumption kWh/100km
16.3 - 17.6 kWh
Electric Range
83 km
Electric Range
325 - 455 km
Battery Capacity
12.90 kWh
Battery Capacity
47 - 62 kWh
co2
56 - 156 g/km
co2
0 g/km
Fuel tank capacity
35 - 51 L
Fuel tank capacity
-

Dimensions and Body
Body Type
MPV
Body Type
SUV
Seats
5
Seats
5
Doors
5
Doors
5
Curb weight
1405 - 1745 kg
Curb weight
1780 - 1910 kg
Trunk capacity
405 - 455 L
Trunk capacity
370 L
Length
4419 mm
Length
4400 mm
Width
1796 mm
Width
1844 mm
Height
1562 mm
Height
1556 mm
Max trunk capacity
1440 - 1540 L
Max trunk capacity
1160 L
Payload
505 - 550 kg
Payload
419 - 450 kg

Engine and Performance
Engine Type
Plugin Hybrid, Petrol MHEV, Diesel
Engine Type
Electric
Transmission
Automatic
Transmission
Automatic
Transmission Detail
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 - 238 HP
Power HP
272 - 428 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
3.7 - 5.8 s
Max Speed
200 - 250 km/h
Max Speed
180 km/h
Torque
200 - 450 Nm
Torque
343 - 584 Nm
Number of Cylinders
4
Number of Cylinders
-
Power kW
85 - 175 kW
Power kW
200 - 315 kW
Engine capacity
1332 - 1991 cm3
Engine capacity
-

General
Model Year
2024 - 2025
Model Year
2023 - 2025
CO2 Efficiency Class
B, D, E, F
CO2 Efficiency Class
A
Brand
Mercedes-Benz
Brand
smart

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What drivetrain options does the Mercedes B Class have?

The Mercedes B Class is offered with Front-Wheel Drive or All-Wheel Drive.

The prices and data displayed are estimates based on German list prices and may vary by country. This information is not legally binding.