Car comparison

BMW 4 Series Gran Coupe (G26) M440ivsBMW 4 Series Convertible (G23) M440d

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

New comparison

BMW 4 Series Gran Coupe (G26)

M440i

374 hp2998 ccGasolineAWDAutomaticTurbochargedCoupe2021-2024
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 Gran Coupe (G26) M440i

  • Quickest 0-100 km/h
    4.7 s
  • Fastest top speed
    265 km/h
    165 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    374 hp
    279 kW
  • Lightest
    1,825 kg
    4,023 lb
  • Best power-to-weight
    205 hp/t
    153 kW/t
    4.9 kg/hp
  • Largest trunk
    470 L
  • Best overall score
    72/100
  • Best practicality score
    69/100

BMW 4 Series Convertible (G23) M440d

  • 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
  • Best performance score
    74/100
  • Best economy score
    89/100

Specification comparison

Specification comparison
ModelBMW4 Series Gran Coupe (G26)M440iBMW4 Series Convertible (G23)M440d
Power
374hp279kW
340hp254kW
Torque
500Nm369lb-ft
700Nm516lb-ft
Curb weight
1,825kg4,023lb
1,980kg4,365lb
Gross weight
2,380kg5,247lb
2,480kg5,467lb
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
67.4s99% target: 262 km/h / 163 mph
Calculated
70.3s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
4.7s
5.0s
0-200 km/h
16.8s
Calculated
18.3s
Calculated
0-60 mph
4.5s
Calculated
4.7s
Calculated
Fuel consumption
8.5L/100 km27.7mpg US33.2mpg UK
6.6L/100 km35.6mpg US42.8mpg UK
Quarter mile
12.8s
Calculated
13.2s
Calculated
Power-to-weight
205hp/t153kW/t93hp/1000 lb
Calculated
172hp/t128kW/t78hp/1000 lb
Calculated
Torque-to-weight
274Nm/t183lb-ft/ton
Calculated
354Nm/t237lb-ft/ton
Calculated
Estimated range
694km431mi
Calculated
894km555mi
Calculated
Displacement
2,998cc183cu in
2,993cc183cu in
Length
4,783mm188in
4,768mm188in
Width
1,852mm73in
1,852mm73in
Height
1,442mm57in
1,384mm54in
Wheelbase
2,856mm112in
2,851mm112in
Front track
1,587mm62in
1,573mm62in
Rear track
1,614mm64in
1,612mm63in
Ground clearance
140mm6in
-
Trunk volume
470L
300L
Max trunk volume
1,290L
385L
Doors
5
2
Seats
5
4
Fuel tank
59L
59L

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 4 Series Gran Coupe (G26) M440iBMW 4 Series Convertible (G23) M440dPowerTorque
  • BMW 4 Series Gran Coupe (G26) M440i: Power / Torque
  • BMW 4 Series Convertible (G23) M440d: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW4 Series Gran Coupe (G26)M440i5,500-6,500 rpm1,900-5,000 rpm6,750 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
MetricBMW4 Series Gran Coupe (G26)M440iBMW4 Series Convertible (G23)M440d
Acceleration checkpoints
0-60 mph
0-97 km/h
4.5 s
4.7 s
0-100 km/h
0-62 mph
4.7 s
5.0 s
0-200 km/h
0-124 mph
16.8 s
18.3 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
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
8.6 s
1000 ft
305 m
10.8 s
11.1 s
1/4 mile
402 m
12.8 s
13.2 s
Trap speed
1/4 mile
402 m
178 km/h
111 mph
174 km/h
108 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Gran Coupe (G26)M440i
374 hp
279 kW
BMW4 Series Convertible (G23)M440d
340 hp
254 kW

BMW 4 Series Gran Coupe (G26) M440i has 34 hp more than BMW 4 Series Convertible (G23) M440d.

The biggest power difference is between BMW 4 Series Convertible (G23) M440d and BMW 4 Series Gran Coupe (G26) M440i: 34 hp (25 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW4 Series Gran Coupe (G26)M440i
500 Nm
369 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
BMW4 Series Gran Coupe (G26)M440i
1,825 kg
4,023 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
BMW4 Series Gran Coupe (G26)M440i
Unrestricted
265 km/h165 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
BMW4 Series Gran Coupe (G26)M440i4.7 s
BMW4 Series Convertible (G23)M440d5.0 s

The biggest 0-100 km/h difference is between BMW 4 Series Gran Coupe (G26) M440i and BMW 4 Series Convertible (G23) M440d: 0.3 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMW4 Series Gran Coupe (G26)M440i
8.5 L/100 km
27.7 mpg US
33.2 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 4 Series Gran Coupe (G26) M440i: 1.9 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
BMW4 Series Gran Coupe (G26)M440i
205 hp/t
153 kW/t
4.9 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
BMW4 Series Gran Coupe (G26)M440i
694 km
431 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
BMW4 Series Gran Coupe (G26)M440i
374 hp
279 kW
4.7 s
Unrestricted
265 km/h165 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
BMW4 Series Gran Coupe (G26)M440i
Power
374 hp
279 kW
0-100 km/h4.7 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Doors/seats
5 doors
5 seats
Trunk
470 L
16.6 cu ft
Length
4,783 mm
188.3 in
Height
1,442 mm
56.8 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
BMW4 Series Gran Coupe (G26)M440i
Power
374 hp
279 kW
0-100 km/h4.7 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
8.5 L/100 km
27.7 mpg US
33.2 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
BMW4 Series Gran Coupe (G26)M440i
8.5 L/100 km
27.7 mpg US
33.2 mpg UK
4.7 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
BMW4 Series Gran Coupe (G26)M440i
205 hp/t
153 kW/t
4.9 kg/hp
8.5 L/100 km
27.7 mpg US
33.2 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
VehicleBMW4 Series Gran Coupe (G26)M440iBMW4 Series Convertible (G23)M440d
Power
374 hp
279 kW
340 hp
254 kW
Torque
500 Nm
369 lb-ft
700 Nm
516 lb-ft
Acceleration
4.7 s
5.0 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,825 kg
4,023 lb
1,980 kg
4,365 lb
Fuel consumption
8.5 L/100 km
27.7 mpg US
33.2 mpg UK
6.6 L/100 km
35.6 mpg US
42.8 mpg UK
Practicality
Doors/seats
5 doors
5 seats
Trunk
470 L
16.6 cu ft
Length
4,783 mm
188.3 in
Height
1,442 mm
56.8 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
694 km
431 mi
894 km
555 mi
Trunk score
470 L
16.6 cu ft
300 L
10.6 cu ft
Power-to-weight score
205 hp/t
153 kW/t
4.9 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 4 Series Gran Coupe (G26) M440iBMW 4 Series Convertible (G23) M440d
Consumption8.5 L/100 km27.7 mpg US33.2 mpg UK6.6 L/100 km35.6 mpg US42.8 mpg UK
Cost / 100 km14.88 LC100 km11.55 LC100 km
Cost / 100 mi23.94 LC100 mi18.59 LC100 mi
Annual fuel used1,275 L337 US gal280 UK gal990 L262 US gal218 UK gal
Annual fuel cost2,231 LC/year1,733 LC/year

Head-to-head comparisons

BMW 4 Series Gran Coupe (G26) M440i

  • Has 34 hp more
  • Is 155 kg lighter
  • Is 0.3 s quicker from 0-100 km/h
  • Has 5 km/h (3 mph) higher top speed
  • Has 33 hp/t better power-to-weight
  • Has 170 L more trunk volume

Pros

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

Cons

  • Highest combined fuel consumption

BMW 4 Series Convertible (G23) M440d

  • Has 200 Nm more
  • Uses 1.9 L/100 km less fuel
  • Has 200 km (124 mi) more estimated range

Pros

  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Heaviest
  • Lowest top speed
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Gran Coupe (G26) M440i
BMW 4 Series Convertible (G23) M440d
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