Car comparison

BMW 2 Series Convertible (F23) M235ivsBMW 4 Series Convertible (G23) M440d

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

BMW 2 Series Convertible (F23)

M235i

326 hp2979 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2015-2016
VS

BMW 4 Series Convertible (G23)

M440d

340 hp2993 ccDieselAWDAutomaticTurbochargedCabriolet / convertible2021-2024

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Best choices

BMW 4 Series Convertible (G23) M440d

  • Most powerful
    340 hp
    254 kW
  • Highest torque
    700 Nm
    516 lb-ft
  • Lowest combined fuel consumption
    6.6 L/100 km
    35.6 mpg US
    42.8 mpg UK
  • Best estimated range
    894 km
    555 mi
  • Largest trunk
    300 L
  • Best overall score
    65/100
  • Best performance score
    74/100
  • Best economy score
    89/100
  • Best practicality score
    45/100

BMW 2 Series Convertible (F23) M235i

  • Quickest 0-100 km/h
    5.0 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Lightest
    1,620 kg
    3,571 lb
  • Best power-to-weight
    201 hp/t
    150 kW/t
    5.0 kg/hp

Specification comparison

Specification comparison
ModelBMW2 Series Convertible (F23)M235iBMW4 Series Convertible (G23)M440d
Power
326hp243kW
340hp254kW
Torque
450Nm332lb-ft
700Nm516lb-ft
Curb weight
1,620kg3,571lb
1,980kg4,365lb
Gross weight
2,050kg4,519lb
2,480kg5,467lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
69.3s99% target: 257 km/h / 160 mph
Calculated
70.3s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.0s
5.0s
0-200 km/h
18.2s
Calculated
18.3s
Calculated
0-60 mph
4.8s
Calculated
4.7s
Calculated
Fuel consumption
7.9L/100 km29.8mpg US35.8mpg UK
6.6L/100 km35.6mpg US42.8mpg UK
Fuel consumption city
10.7L/100 km22mpg US26.4mpg UK
-
Fuel consumption highway
6.2L/100 km37.9mpg US45.6mpg UK
-
Quarter mile
13.2s
Calculated
13.2s
Calculated
Power-to-weight
201hp/t150kW/t91hp/1000 lb
Calculated
172hp/t128kW/t78hp/1000 lb
Calculated
Torque-to-weight
278Nm/t186lb-ft/ton
Calculated
354Nm/t237lb-ft/ton
Calculated
Estimated range
658km409mi
Calculated
894km555mi
Calculated
Displacement
2,979cc182cu in
2,993cc183cu in
Length
4,454mm175in
4,768mm188in
Width
1,774mm70in
1,852mm73in
Height
1,403mm55in
1,384mm54in
Wheelbase
2,690mm106in
2,851mm112in
Front track
1,516mm60in
1,573mm62in
Rear track
1,534mm60in
1,612mm63in
Ground clearance
130mm5in
-
Trunk volume
280L
300L
Max trunk volume
335L
385L
Doors
2
2
Seats
4
4
Fuel tank
52L
59L
CO2 emissions
184g/km
-

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

BMW 2 Series Convertible (F23) M235iBMW 4 Series Convertible (G23) M440dPowerTorque
  • BMW 2 Series Convertible (F23) M235i: Power / Torque
  • BMW 4 Series Convertible (G23) M440d: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW2 Series Convertible (F23)M235i5,800-6,000 rpm1,300-4,500 rpm6,250 rpm
BMW4 Series Convertible (G23)M440d4,400 rpm1,750-2,250 rpm4,650 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW2 Series Convertible (F23)M235iBMW4 Series Convertible (G23)M440d
Acceleration checkpoints
0-60 mph
0-97 km/h
4.8 s
4.7 s
0-100 km/h
0-62 mph
5.0 s
5.0 s
0-200 km/h
0-124 mph
18.2 s
18.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Limited
Drag race simulation
60 ft
18 m
2.1 s
2.1 s
330 ft
101 m
5.7 s
5.7 s
1/8 mile
201 m
8.6 s
8.6 s
1000 ft
305 m
11.1 s
11.1 s
1/4 mile
402 m
13.2 s
13.2 s
Trap speed
1/4 mile
402 m
174 km/h
108 mph
174 km/h
108 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M235i
326 hp
243 kW
BMW4 Series Convertible (G23)M440d
340 hp
254 kW

BMW 4 Series Convertible (G23) M440d has 14 hp more than BMW 2 Series Convertible (F23) M235i.

The biggest power difference is between BMW 2 Series Convertible (F23) M235i and BMW 4 Series Convertible (G23) M440d: 14 hp (10 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M235i
450 Nm
332 lb-ft
BMW4 Series Convertible (G23)M440d
700 Nm
516 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M235i
1,620 kg
3,571 lb
BMW4 Series Convertible (G23)M440d
1,980 kg
4,365 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M235i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW4 Series Convertible (G23)M440d
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M235i5.0 s
BMW4 Series Convertible (G23)M440d5.0 s

Although BMW 4 Series Convertible (G23) M440d has more power, BMW 2 Series Convertible (F23) M235i is quicker from 0-100 km/h.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M235i
7.9 L/100 km
29.8 mpg US
35.8 mpg UK
BMW4 Series Convertible (G23)M440d
6.6 L/100 km
35.6 mpg US
42.8 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (G23) M440d and BMW 2 Series Convertible (F23) M235i: 1.3 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M235i
201 hp/t
150 kW/t
5.0 kg/hp
BMW4 Series Convertible (G23)M440d
172 hp/t
128 kW/t
5.8 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
VehicleValue
BMW2 Series Convertible (F23)M235i
658 km
409 mi
BMW4 Series Convertible (G23)M440d
894 km
555 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW2 Series Convertible (F23)M235i
326 hp
243 kW
5.0 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW4 Series Convertible (G23)M440d
340 hp
254 kW
5.0 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Chart data table
VehiclePerformance scorePracticality score
BMW2 Series Convertible (F23)M235i
Power
326 hp
243 kW
0-100 km/h5.0 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,454 mm
175.4 in
Height
1,403 mm
55.2 in
BMW4 Series Convertible (G23)M440d
Power
340 hp
254 kW
0-100 km/h5.0 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,768 mm
187.7 in
Height
1,384 mm
54.5 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
BMW2 Series Convertible (F23)M235i
Power
326 hp
243 kW
0-100 km/h5.0 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
7.9 L/100 km
29.8 mpg US
35.8 mpg UK
BMW4 Series Convertible (G23)M440d
Power
340 hp
254 kW
0-100 km/h5.0 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
6.6 L/100 km
35.6 mpg US
42.8 mpg UK

BMW 4 Series Convertible (G23) M440d is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
VehicleFuel consumption, L/100 km0-100 km/h, s
BMW2 Series Convertible (F23)M235i
7.9 L/100 km
29.8 mpg US
35.8 mpg UK
5.0 s
BMW4 Series Convertible (G23)M440d
6.6 L/100 km
35.6 mpg US
42.8 mpg UK
5.0 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
BMW2 Series Convertible (F23)M235i
201 hp/t
150 kW/t
5.0 kg/hp
7.9 L/100 km
29.8 mpg US
35.8 mpg UK
BMW4 Series Convertible (G23)M440d
172 hp/t
128 kW/t
5.8 kg/hp
6.6 L/100 km
35.6 mpg US
42.8 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW2 Series Convertible (F23)M235iBMW4 Series Convertible (G23)M440d
Power
326 hp
243 kW
340 hp
254 kW
Torque
450 Nm
332 lb-ft
700 Nm
516 lb-ft
Acceleration
5.0 s
5.0 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,620 kg
3,571 lb
1,980 kg
4,365 lb
Fuel consumption
7.9 L/100 km
29.8 mpg US
35.8 mpg UK
6.6 L/100 km
35.6 mpg US
42.8 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,454 mm
175.4 in
Height
1,403 mm
55.2 in
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,768 mm
187.7 in
Height
1,384 mm
54.5 in
Range score
658 km
409 mi
894 km
555 mi
CO2 score
184 g/km
-
Trunk score
280 L
9.9 cu ft
300 L
10.6 cu ft
Power-to-weight score
201 hp/t
150 kW/t
5.0 kg/hp
172 hp/t
128 kW/t
5.8 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
VehicleBMW 2 Series Convertible (F23) M235iBMW 4 Series Convertible (G23) M440d
Consumption7.9 L/100 km29.8 mpg US35.8 mpg UK6.6 L/100 km35.6 mpg US42.8 mpg UK
Cost / 100 km13.83 LC100 km11.55 LC100 km
Cost / 100 mi22.25 LC100 mi18.59 LC100 mi
Annual fuel used1,185 L313 US gal261 UK gal990 L262 US gal218 UK gal
Annual fuel cost2,074 LC/year1,733 LC/year

Head-to-head comparisons

BMW 2 Series Convertible (F23) M235i

  • Is 360 kg lighter
  • Has 30 hp/t better power-to-weight

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Lightest
  • Best power-to-weight ratio

Cons

  • Lowest power
  • Highest combined fuel consumption
  • Smallest trunk

BMW 4 Series Convertible (G23) M440d

  • Has 14 hp more
  • Has 250 Nm more
  • Uses 1.3 L/100 km less fuel
  • Has 236 km (146 mi) more estimated range
  • Has 20 L more trunk volume

Pros

  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Heaviest

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 2 Series Convertible (F23) M235i
BMW 4 Series Convertible (G23) M440d
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