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BMW 4 Series Convertible vs smart #5 comparison

Compare performance (530 HP vs 646 HP), boot space and price (52,600 £ vs 39,300 £ ) at a glance. Find out which car is the better choice for you – BMW 4 Series Convertible or smart #5?

BMW 4 Series Convertible vs smart #5: Key differences

BMW 4 Series Convertible

  • only slightly quicker 0–100 km/h
  • markedly lighter
details

smart #5

4.9 (5 Reviews)
rate
  • noticeably cheaper
  • moderately more power
  • visibly more trunk space
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

4 Series Convertible

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.

smart #5 is noticeably cheaper – starting at 39,300 £ , while the BMW 4 Series Convertible costs 52,600 £ . That’s a price difference of around 13,286 £.

#5

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 #5 offers moderately more power – delivering 646 HP compared to 530 HP. That’s roughly 116 HP more horsepower.

When accelerating from 0 to 100 km/h, the BMW 4 Series Convertible is only slightly quicker – completing the sprint in 3.7 s, while the smart #5 takes 3.8 s. That’s about 0.1 s quicker.

There’s also a difference in torque: the smart #5 delivers only slightly more torque with 710 Nm compared to 700 Nm. That’s about 10 Nm more.

4 Series Convertible

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.

Seats: smart #5 offers more seats – 5 vs 4.

In terms of curb weight, BMW 4 Series Convertible is markedly lighter – 1,765 kg compared to 2,200 kg. The difference is around 435 kg.

Looking at boot space, the smart #5 offers visibly more boot space – 630 L compared to 385 L. That’s a difference of about 245 L.

When it comes to payload, the smart #5 carries moderately more – 502 kg compared to 420 kg. That’s a difference of about 82 kg.

Who wins the race in the data check?

The smart #5 is decisively ahead 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

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smart #5
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BMW 4 Series Convertible
smart #5

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

BMW 4 Series Convertible

The BMW 4 Series Convertible blends coupe-like elegance with open-top drama, its sleek profile and distinctive grille demanding attention whether the roof’s up or down. Behind the wheel it serves up taut handling and a refined ride, making it a rewarding choice for drivers who want sporty character without sacrificing everyday comfort — and yes, it looks spectacular when you drop the top.

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Reviews BMW 4 Series Convertible

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

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!

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BMW 4 Series Convertible
smart #5

Costs and Consumption
Price
52,600 - 97,800 £
Price
39,300 - 52,200 £
Consumption L/100km
5.2 - 10.2 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
136 - 231 g/km
co2
0 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Convertible
Body Type
SUV
Seats
4
Seats
5
Doors
-
Doors
5
Curb weight
1,765 - 2,055 kg
Curb weight
2,200 - 2,378 kg
Trunk capacity
385 L
Trunk capacity
630 L
Length
-
Length
4,695 mm
Width
1,852 - 1,887 mm
Width
1,920 mm
Height
-
Height
1,705 mm
Max trunk capacity
-
Max trunk capacity
1,530 L
Payload
345 - 420 kg
Payload
475 - 502 kg

Engine and Performance
Engine Type
Diesel MHEV, Petrol, Petrol MHEV
Engine Type
Electric
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Reduction Gearbox
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
184 - 530 HP
Power HP
340 - 646 HP
Acceleration 0-100km/h
3.7 - 8.2 s
Acceleration 0-100km/h
3.8 - 6.9 s
Max Speed
-
Max Speed
200 - 210 km/h
Torque
300 - 700 Nm
Torque
373 - 710 Nm
Number of Cylinders
4 - 6
Number of Cylinders
-
Power kW
135 - 390 kW
Power kW
250 - 475 kW
Engine capacity
1,995 - 2,998 cm3
Engine capacity
-

General
Model Year
2,024 - 2,025
Model Year
2025
CO2 Efficiency Class
E, F, G
CO2 Efficiency Class
A
Brand
BMW
Brand
smart
What drive types are available for the BMW 4 Series Convertible?

The BMW 4 Series Convertible is available as Rear-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.