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BMW Z4 vs Porsche 911 Convertible comparison

Compare performance (340 HP vs 711 HP), boot space and price (43,500 £ vs 138,000 £ ) at a glance. Find out which car is the better choice for you – BMW Z4 or Porsche 911 Convertible?

BMW Z4 vs Porsche 911 Convertible: Key differences

BMW Z4

4.4 (1 Reviews)
rate
  • clearly cheaper
  • significantly more efficient
  • only slightly lighter
details

Porsche 911 Convertible

  • substantially more power
  • considerably quicker 0–100 km/h
  • noticeably 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

Z4

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.

BMW Z4 is clearly cheaper – starting at 43,500 £ , while the Porsche 911 Convertible costs 138,000 £ . That’s a price difference of around 94,543 £.

Fuel consumption also shows a difference: the BMW Z4 uses 6.9 L/100km and is significantly more efficient than the Porsche 911 Convertible with 10.5 L/100km. The difference is about 3.6 L/100km.

911 Convertible

Engine and Performance:

Power, torque and acceleration say a lot about how a car feels on the road. This is where you see which model delivers more driving dynamics.

When it comes to engine power, the Porsche 911 Convertible offers substantially more power – delivering 711 HP compared to 340 HP. That’s roughly 371 HP more horsepower.

When accelerating from 0 to 100 km/h, the Porsche 911 Convertible is considerably quicker – completing the sprint in 2.6 s, while the BMW Z4 takes 4.5 s. That’s about 1.9 s quicker.

There’s also a difference in torque: the Porsche 911 Convertible delivers visibly more torque with 800 Nm compared to 500 Nm. That’s about 300 Nm more.

Z4

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: Porsche 911 Convertible offers more seats – 4 vs 2.

In terms of curb weight, BMW Z4 is only slightly lighter – 1,510 kg compared to 1,572 kg. The difference is around 62 kg.

Looking at boot space, the Porsche 911 Convertible offers noticeably more boot space – 373 L compared to 281 L. That’s a difference of about 92 L.

When it comes to payload, the Porsche 911 Convertible carries noticeably more – 345 kg compared to 235 kg. That’s a difference of about 110 kg.

Who wins the race in the data check?

The Porsche 911 Convertible holds a narrow overall lead 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 £138,000
911 Convertible

Porsche 911 Convertible

  • Engine Type Petrol, Full Hybrid
  • Transmission Manuel, Automatic
  • Drive Type Rear-Wheel Drive, All-Wheel Drive
  • Power HP 394 - 711 HP
  • Consumption L/100km 10.5 - 13.7 L/100km
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Frequently compared as well

BMW 4 Series Convertible
BMW Z4
VS
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

BMW Z4

The BMW Z4 is a taut, road-hugging roadster that pairs elegant, low-slung styling with a roof you can drop on a sunny whim, delivering that pure, wind-in-your-hair driving thrill few cars manage to match. It’s an ideal weekend companion for drivers who prefer engagement over practicality — bring good shoes rather than a lot of luggage, and you’ll get a grin every time you turn the wheel.

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P90479448_highRes_bmw-z4-m40i-09-2022
P90479454_highRes_bmw-z4-m40i-09-2022
P90479457_highRes_bmw-z4-m40i-09-2022
P90479470_highRes_bmw-z4-m40i-09-2022
P90479471_highRes_bmw-z4-m40i-09-2022

Reviews BMW Z4

4.4 (1 Reviews)
rate
Maingard
26 Apr 2026, 13:19:10

Responsive car, very high-performing, very agile in corners.

How do you mainly use this car? (optional): Leisure / Weekend driver
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money

Porsche 911 Convertible

The Porsche 911 Cabriolet transforms the iconic silhouette into an open‑air weapon, offering roof-down glamour and razor-sharp handling that still feels perfectly composed on normal roads. It’s the kind of car that serves daily duties with surprising ease while delivering intoxicating engine music and a grin factor that makes every trip feel like a small victory.

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Reviews Porsche 911 Convertible

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

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Porsche 911 Convertible

Costs and Consumption
Price
43,500 - 65,300 £
Price
138,000 - 244,500 £
Consumption L/100km
6.9 - 8.5 L/100km
Consumption L/100km
10.5 - 13.7 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
157 - 191 g/km
co2
237 - 310 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Roadster
Body Type
Convertible
Seats
2
Seats
2 - 4
Doors
-
Doors
-
Curb weight
1,510 - 1,640 kg
Curb weight
1,572 - 1,900 kg
Trunk capacity
281 L
Trunk capacity
163 - 373 L
Length
-
Length
-
Width
1,864 mm
Width
1,852 - 1,900 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
215 - 235 kg
Payload
195 - 345 kg

Engine and Performance
Engine Type
Petrol
Engine Type
Petrol, Full Hybrid
Transmission
Manuel, Automatic
Transmission
Manuel, Automatic
Transmission Detail
Manual Gearbox, Automatic Gearbox
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Drive Type
Rear-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
197 - 340 HP
Power HP
394 - 711 HP
Acceleration 0-100km/h
4.5 - 6.8 s
Acceleration 0-100km/h
2.6 - 4.7 s
Max Speed
-
Max Speed
-
Torque
320 - 500 Nm
Torque
450 - 800 Nm
Number of Cylinders
4 - 6
Number of Cylinders
6
Power kW
145 - 250 kW
Power kW
290 - 523 kW
Engine capacity
1,998 - 2,998 cm3
Engine capacity
2,981 - 3,996 cm3

General
Model Year
2,025 - 2,026
Model Year
2,024 - 2,026
CO2 Efficiency Class
F, G
CO2 Efficiency Class
G
Brand
BMW
Brand
Porsche
Is the BMW Z4 offered with different drivetrains?

The BMW Z4 is available as Rear-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.