Car comparison

BMW X4 (G02) M40ivsBMW 4 Series Convertible (G23) M440i

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

New comparison

BMW X4 (G02)

M40i

360 hp2998 ccGasolineAWDAutomaticTurbocharged2019-2021
VS

BMW 4 Series Convertible (G23)

M440i

374 hp2998 ccGasolineAWDAutomaticTurbochargedCabriolet / convertible2020-2024

Comparison overview

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

Best choices

BMW X4 (G02) M40i

  • Quickest 0-100 km/h
    4.8 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Highest torque
    500 Nm
    369 lb-ft
  • Lightest
    1,865 kg
    4,112 lb
  • Best estimated range
    802 km
    499 mi
  • Largest trunk
    525 L
  • Best overall score
    73/100
  • Best practicality score
    76/100

BMW 4 Series Convertible (G23) M440i

  • Most powerful
    374 hp
    279 kW
  • Best power-to-weight
    198 hp/t
    148 kW/t
    5.1 kg/hp
  • Lowest combined fuel consumption
    7.4 L/100 km
    31.8 mpg US
    38.2 mpg UK
  • Lowest city consumption
    9.3 L/100 km
    25.3 mpg US
    30.4 mpg UK
  • Lowest highway consumption
    6.2 L/100 km
    37.9 mpg US
    45.6 mpg UK
  • Best performance score
    72/100
  • Best economy score
    87/100

Specification comparison

Specification comparison
ModelBMWX4 (G02)M40iBMW4 Series Convertible (G23)M440i
Power
360hp268kW
374hp279kW
Torque
500Nm369lb-ft
500Nm369lb-ft
Curb weight
1,865kg4,112lb
1,890kg4,167lb
Gross weight
2,430kg5,357lb
2,390kg5,269lb
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
70.3s99% target: 257 km/h / 160 mph
Calculated
65.6s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
4.8s
4.9s
0-200 km/h
18.0s
Calculated
17.5s
Calculated
0-60 mph
4.6s
Calculated
4.7s
Calculated
Fuel consumption
8.1L/100 km29mpg US34.9mpg UK
7.4L/100 km31.8mpg US38.2mpg UK
Fuel consumption city
10L/100 km23.5mpg US28.2mpg UK
9.3L/100 km25.3mpg US30.4mpg UK
Fuel consumption highway
7L/100 km33.6mpg US40.4mpg UK
6.2L/100 km37.9mpg US45.6mpg UK
Quarter mile
13.0s
Calculated
13.0s
Calculated
Power-to-weight
193hp/t144kW/t88hp/1000 lb
Calculated
198hp/t148kW/t90hp/1000 lb
Calculated
Torque-to-weight
268Nm/t179lb-ft/ton
Calculated
265Nm/t177lb-ft/ton
Calculated
Estimated range
802km499mi
Calculated
797km495mi
Calculated
Displacement
2,998cc183cu in
2,998cc183cu in
Length
4,752mm187in
4,770mm188in
Width
1,938mm76in
1,852mm73in
Height
1,621mm64in
1,394mm55in
Wheelbase
2,864mm113in
2,851mm112in
Front track-
1,575mm62in
Rear track-
1,611mm63in
Ground clearance-
126mm5in
Trunk volume
525L
300L
Max trunk volume
1,430L
385L
Doors
5
2
Seats
5
4
Fuel tank
65L
59L
CO2 emissions
185g/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 X4 (G02) M40iBMW 4 Series Convertible (G23) M440iPowerTorque
  • BMW X4 (G02) M40i: Power / Torque
  • BMW 4 Series Convertible (G23) M440i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMWX4 (G02)M40i5,200-6,500 rpm1,850-5,000 rpm6,750 rpm
BMW4 Series Convertible (G23)M440i5,500-6,500 rpm1,900-5,000 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMWX4 (G02)M40iBMW4 Series Convertible (G23)M440i
Acceleration checkpoints
0-60 mph
0-97 km/h
4.6 s
4.7 s
0-100 km/h
0-62 mph
4.8 s
4.9 s
0-200 km/h
0-124 mph
18.0 s
17.5 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
5.6 s
5.7 s
1/8 mile
201 m
8.4 s
8.5 s
1000 ft
305 m
10.9 s
11.0 s
1/4 mile
402 m
13.0 s
13.0 s
Trap speed
1/4 mile
402 m
175 km/h
109 mph
176 km/h
110 mph

Power comparison

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

Chart data table
VehicleValue
BMWX4 (G02)M40i
360 hp
268 kW
BMW4 Series Convertible (G23)M440i
374 hp
279 kW

BMW 4 Series Convertible (G23) M440i has 14 hp more than BMW X4 (G02) M40i.

The biggest power difference is between BMW X4 (G02) M40i and BMW 4 Series Convertible (G23) M440i: 14 hp (10 kW).

Torque comparison

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

Chart data table
VehicleValue
BMWX4 (G02)M40i
500 Nm
369 lb-ft
BMW4 Series Convertible (G23)M440i
500 Nm
369 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMWX4 (G02)M40i
1,865 kg
4,112 lb
BMW4 Series Convertible (G23)M440i
1,890 kg
4,167 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMWX4 (G02)M40i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW4 Series Convertible (G23)M440i
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
BMWX4 (G02)M40i4.8 s
BMW4 Series Convertible (G23)M440i4.9 s

Although BMW 4 Series Convertible (G23) M440i has more power, BMW X4 (G02) M40i is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW X4 (G02) M40i and BMW 4 Series Convertible (G23) M440i: 0.1 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMWX4 (G02)M40i
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
BMW4 Series Convertible (G23)M440i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (G23) M440i and BMW X4 (G02) M40i: 0.7 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
BMWX4 (G02)M40i
193 hp/t
144 kW/t
5.2 kg/hp
BMW4 Series Convertible (G23)M440i
198 hp/t
148 kW/t
5.1 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMWX4 (G02)M40i
802 km
499 mi
BMW4 Series Convertible (G23)M440i
797 km
495 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMWX4 (G02)M40i
360 hp
268 kW
4.8 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW4 Series Convertible (G23)M440i
374 hp
279 kW
4.9 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
BMWX4 (G02)M40i
Power
360 hp
268 kW
0-100 km/h4.8 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
5 doors
5 seats
Trunk
525 L
18.5 cu ft
Length
4,752 mm
187.1 in
Height
1,621 mm
63.8 in
BMW4 Series Convertible (G23)M440i
Power
374 hp
279 kW
0-100 km/h4.9 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
4,770 mm
187.8 in
Height
1,394 mm
54.9 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
BMWX4 (G02)M40i
Power
360 hp
268 kW
0-100 km/h4.8 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
BMW4 Series Convertible (G23)M440i
Power
374 hp
279 kW
0-100 km/h4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
7.4 L/100 km
31.8 mpg US
38.2 mpg UK

BMW 4 Series Convertible (G23) M440i 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
BMWX4 (G02)M40i
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
4.8 s
BMW4 Series Convertible (G23)M440i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
4.9 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
BMWX4 (G02)M40i
193 hp/t
144 kW/t
5.2 kg/hp
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
BMW4 Series Convertible (G23)M440i
198 hp/t
148 kW/t
5.1 kg/hp
7.4 L/100 km
31.8 mpg US
38.2 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMWX4 (G02)M40iBMW4 Series Convertible (G23)M440i
Power
360 hp
268 kW
374 hp
279 kW
Torque
500 Nm
369 lb-ft
500 Nm
369 lb-ft
Acceleration
4.8 s
4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,865 kg
4,112 lb
1,890 kg
4,167 lb
Fuel consumption
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
Practicality
Doors/seats
5 doors
5 seats
Trunk
525 L
18.5 cu ft
Length
4,752 mm
187.1 in
Height
1,621 mm
63.8 in
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,770 mm
187.8 in
Height
1,394 mm
54.9 in
Range score
802 km
499 mi
797 km
495 mi
CO2 score
185 g/km
-
Trunk score
525 L
18.5 cu ft
300 L
10.6 cu ft
Power-to-weight score
193 hp/t
144 kW/t
5.2 kg/hp
198 hp/t
148 kW/t
5.1 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 X4 (G02) M40iBMW 4 Series Convertible (G23) M440i
Consumption8.1 L/100 km29 mpg US34.9 mpg UK7.4 L/100 km31.8 mpg US38.2 mpg UK
Cost / 100 km14.17 LC100 km12.95 LC100 km
Cost / 100 mi22.81 LC100 mi20.84 LC100 mi
Annual fuel used1,215 L321 US gal267 UK gal1,110 L293 US gal244 UK gal
Annual fuel cost2,126 LC/year1,943 LC/year

Head-to-head comparisons

BMW X4 (G02) M40i

  • Is 25 kg lighter
  • Is 0.1 s quicker from 0-100 km/h
  • Has 5 km (3 mi) more estimated range
  • Has 225 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Highest torque
  • Lightest
  • Best estimated range
  • Largest trunk

Cons

  • Lowest power
  • Highest combined fuel consumption

BMW 4 Series Convertible (G23) M440i

  • Has 14 hp more
  • Uses 0.7 L/100 km less fuel
  • Has 5 hp/t better power-to-weight

Pros

  • Most powerful
  • Lowest combined fuel consumption
  • Best power-to-weight ratio

Cons

  • Slowest 0-100 km/h
  • Heaviest
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW X4 (G02) M40i
BMW 4 Series Convertible (G23) M440i
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