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Mercedes B Class vs smart #5 comparison

Compare performance (238 HP vs 646 HP), boot space and price (33,100 £ vs 39,300 £ ) at a glance. Find out which car is the better choice for you – Mercedes B Class or smart #5?

Mercedes B Class vs smart #5: Key differences

Mercedes B Class

4.9 (5 Reviews)
rate
  • a bit cheaper
  • substantially lighter
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smart #5

4.9 (5 Reviews)
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  • significantly more power
  • substantially quicker 0–100 km/h
  • clearly 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

B Class

Costs and Efficiency:

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

Mercedes B Class is a bit cheaper – starting at 33,100 £ , while the smart #5 costs 39,300 £ . That’s a price difference of around 6,213 £.

#5

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 #5 offers significantly more power – delivering 646 HP compared to 238 HP. That’s roughly 408 HP more horsepower.

When accelerating from 0 to 100 km/h, the smart #5 is substantially 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 smart #5 delivers significantly more torque with 710 Nm compared to 400 Nm. That’s about 310 Nm more.

B Class

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, Mercedes B Class is substantially lighter – 1,405 kg compared to 2,200 kg. The difference is around 795 kg.

Looking at boot space, the smart #5 offers clearly more boot space – 630 L compared to 455 L. That’s a difference of about 175 L.

When it comes to payload, the Mercedes B Class carries very slightly more – 550 kg compared to 502 kg. That’s a difference of about 48 kg.

Who wins the race in the data check?

The smart #5 stands well ahead of its rival 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 £39,300
#5

smart #5

  • Engine Type Electric
  • Transmission Automatic
  • Drive Type Rear-Wheel Drive, All-Wheel Drive
  • Power HP 340 - 646 HP
  • Consumption kWh/100km 18.4 - 19.9 kWh/100km
  • Electric Range 465 - 590 km
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Frequently compared as well

Mercedes B Class
Mercedes GLA
VS
The Mercedes B‑Class and Mercedes GLA target buyers who want Mercedes practicality with premium touches, but they take different paths: the B‑Class is a spacious, hatchback-style people carrier while the GLA is a compact crossover with a higher ride height and sportier stance. This comparison looks …
Mercedes GLB
smart #5
VS
The Mercedes GLB is a sensible, slightly boxy premium compact SUV that delivers real-world space, family practicality and a composed long-distance ride, while the smart #5 is a punchy electric crossover that trades rear-seat room for sharp styling, low running costs and urban agility. If you …
Mercedes B Class
smart #5

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

smart #5

The Smart #5 continues to build on the brand's legacy of compact and efficient urban vehicles, now infused with a more modern and stylish design. Its sleek appearance is complemented by a spacious interior, offering comfort without compromising its compact nature. This model is ideal for city dwellers seeking a blend of innovation, practicality, and style in their daily drives.

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Reviews smart #5

4.9 (5 Reviews)
rate
Stefan
31 Jan 2026, 22:25:16

I spent a weekend with the Brabus #5 and I’m thrilled! Extremely quiet, even at just under 220 km/h. Very good ride comfort, especially if, like me, you prefer a softer setup for better suspension comfort!
Brutal acceleration that only really hits from about 50 km/h and culminates in a 0–200 km/h sprint in 10.2 seconds… There are almost no cars up to roughly 1,000 hp that are faster!
The actual charging performance is, I believe, the best of any passenger car available in the EU (only Zeekr shows a little more on paper, but probably not in real life) — it charges at peaks up to 425 kW! 10–80% in 13 minutes and 5–100% in 28 minutes.
The fit and finish are in places better than the Mercedes E‑Class...

How do you mainly use this car? (optional): Long-distance driver
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Stefan
4 Dec 2025, 21:11:24

Apart from the hopefully soon improved/reduced chimes and the horrendously hard-to-reach mute for the speed warning, the car is really a knockout!
Very, very quiet, comfortable, extremely fast (Brabus version), great build quality, great equipment!

Frequently compared as well

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Mercedes B Class
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Mercedes B Class
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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 …
Tesla Model Y
smart #5
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Mercedes B Class
Mercedes GLB
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smart #3
smart #5
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Audi Q2
Mercedes B Class
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In the competitive compact SUV market, the Audi Q2 stands out with its bold design and sporty handling, appealing to those seeking a dynamic driving experience. In contrast, the Mercedes B-Klasse emphasizes practicality and comfort, offering a spacious interior and advanced technology features that …
Audi Q3
Mercedes B Class
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In the competitive landscape of compact luxury vehicles, the Audi Q3 stands out with its dynamic design and sporty performance, appealing to drivers seeking a spirited driving experience. On the other hand, the Mercedes B-Klasse offers a more practical approach, prioritizing spacious interiors and …
XPeng G6
smart #5
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The XPeng G6 and the Smart #5 represent two different takes on the modern electric crossover — the XPeng G6 emphasizes advanced driver-assist systems and longer-range performance, while the Smart #5 focuses on compact, stylish urban practicality. This comparison will highlight how they differ in …
Mercedes B Class
smart #5

Costs and Consumption
Price
33,100 - 52,500 £
Price
39,300 - 52,200 £
Consumption L/100km
5.1 - 6.9 L/100km
Consumption L/100km
-
Consumption kWh/100km
-
Consumption kWh/100km
18.4 - 19.9 kWh/100km
Electric Range
-
Electric Range
465 - 590 km
Battery Capacity
-
Battery Capacity
74.4 - 94 kWh
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
5
Curb weight
1,405 - 1,565 kg
Curb weight
2,200 - 2,378 kg
Trunk capacity
445 - 455 L
Trunk capacity
630 L
Length
-
Length
4,695 mm
Width
1,796 mm
Width
1,920 mm
Height
-
Height
1,705 mm
Max trunk capacity
-
Max trunk capacity
1,530 L
Payload
515 - 550 kg
Payload
475 - 502 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, All-Wheel Drive
Power HP
116 - 238 HP
Power HP
340 - 646 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
3.8 - 6.9 s
Max Speed
-
Max Speed
200 - 210 km/h
Torque
200 - 400 Nm
Torque
373 - 710 Nm
Number of Cylinders
4
Number of Cylinders
-
Power kW
85 - 175 kW
Power kW
250 - 475 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.