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Mercedes B Class vs smart #3 comparison

Compare performance (238 HP vs 272 HP), boot space and price (33,100 £ vs 42,000 £ ) at a glance. Find out which car is the better choice for you – Mercedes B Class or smart #3?

Mercedes B Class vs smart #3: Key differences

Mercedes B Class

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

smart #3

5 (1 Reviews)
rate
  • moderately more power
  • slightly quicker 0–100 km/h
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:

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 B Class is clearly cheaper – starting at 33,100 £ , while the smart #3 costs 42,000 £ . That’s a price difference of around 8,862 £.

#3

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 smart #3 offers moderately more power – delivering 272 HP compared to 238 HP. That’s roughly 34 HP more horsepower.

When accelerating from 0 to 100 km/h, the smart #3 is slightly quicker – completing the sprint in 5.8 s, while the Mercedes B Class takes 6.5 s. That’s about 0.7 s quicker.

There’s also a difference in torque: the Mercedes B Class delivers only slightly more torque with 400 Nm compared to 384 Nm. That’s about 16 Nm more.

B Class

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, Mercedes B Class is clearly lighter – 1,405 kg compared to 1,810 kg. The difference is around 405 kg.

Looking at boot space, the Mercedes B Class offers moderately more boot space – 455 L compared to 370 L. That’s a difference of about 85 L.

When it comes to payload, the Mercedes B Class carries somewhat more – 550 kg compared to 450 kg. That’s a difference of about 100 kg.

Who wins the race in the data check?

The smart #3 leads convincingly 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.

£41,991
#3

smart #3

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

Frequently compared as well

Mercedes A Class
Mercedes B Class
VS
The Mercedes A‑Class is the sporty, tech‑savvy compact that thrills with sharp handling and a slick cockpit, while the Mercedes B‑Class trades a bit of attitude for towering practicality, roomier seats and a more useful boot. Choose the A‑Class if you want driving fun and style; pick the B‑Class if …
Mercedes B Class
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Mercedes B Class
smart #3

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.

details
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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

smart #3

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.

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Reviews smart #3

5 (1 Reviews)
rate
Ronny
16 Oct 2025, 13:10:59

Handsome design, packed with advanced driver‑assist technology and stellar performance — all at an attractive price. Highly recommended, this car!

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BMW 2 Series Active Tourer
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Mercedes B Class
smart #3

Costs and Consumption
Price
33,100 - 52,500 £
Price
42,000 £
Consumption L/100km
5.1 - 6.9 L/100km
Consumption L/100km
-
Consumption kWh/100km
-
Consumption kWh/100km
16.3 kWh/100km
Electric Range
-
Electric Range
455 km
Battery Capacity
-
Battery Capacity
-
co2
133 - 156 g/km
co2
0 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
MPV
Body Type
SUV
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,405 - 1,565 kg
Curb weight
1,810 kg
Trunk capacity
445 - 455 L
Trunk capacity
370 L
Length
-
Length
-
Width
1,796 mm
Width
1,844 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
515 - 550 kg
Payload
450 kg

Engine and Performance
Engine Type
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
Power HP
116 - 238 HP
Power HP
272 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
5.8 s
Max Speed
-
Max Speed
-
Torque
200 - 400 Nm
Torque
384 Nm
Number of Cylinders
4
Number of Cylinders
-
Power kW
85 - 175 kW
Power kW
200 kW
Engine capacity
1,332 - 1,991 cm3
Engine capacity
-

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