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BMW Z4 vs Porsche 911 Convertible comparison

Compare performance (340 HP vs 711 HP), boot space and price (43500 £ vs 122400 £ ) 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

  • clearly cheaper
  • clearly more efficient
  • slight lighter
  • clearly more trunk space

Porsche 911 Convertible

  • decisively more power
  • significantly quicker from 0–100 km/h

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

Z4

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.

BMW Z4 has a clearly advantage in terms of price – it starts at 43500 £ , while the Porsche 911 Convertible costs 122400 £ . That’s a price difference of around 78943 £.

Fuel consumption also shows a difference: BMW Z4 manages with 6.90 L and is therefore clearly more efficient than the Porsche 911 Convertible with 10.30 L. The difference is about 3.40 L per 100 km.

Z4

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 Porsche 911 Convertible has a decisively edge – offering 711 HP compared to 340 HP. That’s roughly 371 HP more horsepower.

In acceleration from 0 to 100 km/h, the Porsche 911 Convertible is significantly quicker – completing the sprint in 2.60 s, while the BMW Z4 takes 4.50 s. That’s about 1.90 s faster.

There’s also a difference in torque: Porsche 911 Convertible pulls clearly perceptible stronger with 800 Nm compared to 500 Nm. That’s about 300 Nm difference.

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 significantly more seating capacity – 4 vs 2.

In curb weight, BMW Z4 is slight lighter – 1510 kg compared to 1655 kg. The difference is around 145 kg.

In terms of boot space, the BMW Z4 offers clearly more room – 281 L compared to 163 L. That’s a difference of about 118 L.

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

Who wins the race in the data check?

The BMW Z4 is barely 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.

Frequently compared as well

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When it comes to choosing between the BMW 4 Series Convertible and the BMW Z4, enthusiasts are presented with two distinctly appealing options. The 4 Series Convertible offers a blend of luxury and practicality, making it an ideal choice for those who seek a spacious interior without compromising …
BMW Z4
Porsche 911 Convertible

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis
from about £43,500
Z4

BMW Z4

  • Engine Type : Petrol
  • Transmission : Manuel, Automatic
  • Drive Type : Rear-Wheel Drive
  • Power HP : 197 - 340 HP
  • Consumption L/100km : 6.9 - 8.5 L
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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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P90479454_highRes_bmw-z4-m40i-09-2022
P90479457_highRes_bmw-z4-m40i-09-2022
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P90479471_highRes_bmw-z4-m40i-09-2022

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 BMW Z4

Reviews Porsche 911 Convertible

BMW Z4
Porsche 911 Convertible

Costs and Consumption
Price
43500 - 65300 £
Price
122400 - 244500 £
Consumption L/100km
6.9 - 8.5 L
Consumption L/100km
10.3 - 11.7 L
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
157 - 191 g/km
co2
234 - 265 g/km
Fuel tank capacity
-
Fuel tank capacity
63 L

Dimensions and Body
Body Type
Roadster
Body Type
Convertible
Seats
2
Seats
4
Doors
-
Doors
2
Curb weight
1510 - 1640 kg
Curb weight
1655 - 1900 kg
Trunk capacity
281 L
Trunk capacity
163 L
Length
-
Length
4542 - 4553 mm
Width
1864 mm
Width
1852 - 1900 mm
Height
-
Height
1292 - 1298 mm
Max trunk capacity
-
Max trunk capacity
-
Payload
215 - 235 kg
Payload
275 - 345 kg

Engine and Performance
Engine Type
Petrol
Engine Type
Petrol, Full Hybrid
Transmission
Manuel, Automatic
Transmission
Automatic, Manuel
Transmission Detail
Manual Gearbox, Automatic Gearbox
Transmission Detail
Dual-Clutch Automatic, Manual Gearbox
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
291 - 322 km/h
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
1998 - 2998 cm3
Engine capacity
2981 - 3591 cm3

General
Model Year
2025 - 2026
Model Year
2024 - 2026
CO2 Efficiency Class
F, G
CO2 Efficiency Class
G
Brand
BMW
Brand
Porsche

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What drive types are available for the BMW Z4?

The BMW Z4 is offered with Rear-Wheel Drive.

The prices shown are estimates based on German list prices, adjusted for local VAT. Local registration taxes (e.g. NoVA, BPM or CO2 malus) are not included. This information is not legally binding.