Car comparison

BMW 4 Series Convertible (G23) M440ivsBMW X3 (G01 LCI) · Facelift 2021 M40i

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

New comparison

BMW 4 Series Convertible (G23)

M440i

374 hp2998 ccGasolineAWDAutomaticTurbochargedCabriolet / convertible2020-2024
VS

BMW X3 (G01 LCI) · Facelift 2021

M40i

360 hp2998 ccGasolineAWDAutomaticTurbocharged2021-2024

Comparison overview

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

Best choices

BMW 4 Series Convertible (G23) M440i

  • Quickest 0-100 km/h
    4.9 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    374 hp
    279 kW
  • Highest torque
    500 Nm
    369 lb-ft
  • Lightest
    1,890 kg
    4,167 lb
  • 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
  • Best estimated range
    797 km
    495 mi
  • Best performance score
    72/100
  • Best economy score
    87/100

Specification comparison

Specification comparison
ModelBMW4 Series Convertible (G23)M440iBMWX3 (G01 LCI)Facelift 2021M40i
Power
374hp279kW
360hp268kW
Torque
500Nm369lb-ft
500Nm369lb-ft
Curb weight
1,890kg4,167lb
1,910kg4,211lb
Gross weight
2,390kg5,269lb
2,485kg5,478lb
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
65.6s99% target: 257 km/h / 160 mph
Calculated
74.2s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
4.9s
4.9s
0-200 km/h
17.5s
Calculated
18.6s
Calculated
0-60 mph
4.7s
Calculated
4.6s
Calculated
Fuel consumption
7.4L/100 km31.8mpg US38.2mpg UK
9.5L/100 km24.8mpg US29.7mpg UK
Fuel consumption city
9.3L/100 km25.3mpg US30.4mpg UK
-
Fuel consumption highway
6.2L/100 km37.9mpg US45.6mpg UK
-
Quarter mile
13.0s
Calculated
13.1s
Calculated
Power-to-weight
198hp/t148kW/t90hp/1000 lb
Calculated
188hp/t141kW/t85hp/1000 lb
Calculated
Torque-to-weight
265Nm/t177lb-ft/ton
Calculated
262Nm/t175lb-ft/ton
Calculated
Estimated range
797km495mi
Calculated
684km425mi
Calculated
Displacement
2,998cc183cu in
2,998cc183cu in
Length
4,770mm188in
4,713mm186in
Width
1,852mm73in
1,897mm75in
Height
1,394mm55in
1,676mm66in
Wheelbase
2,851mm112in
2,864mm113in
Front track
1,575mm62in
1,615mm64in
Rear track
1,611mm63in
1,594mm63in
Ground clearance
126mm5in
204mm8in
Trunk volume
300L
550L
Max trunk volume
385L
1,600L
Doors
2
5
Seats
4
5
Fuel tank
59L
65L

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 Convertible (G23) M440iBMW X3 (G01 LCI) Facelift 2021 M40iPowerTorque
  • BMW 4 Series Convertible (G23) M440i: Power / Torque
  • BMW X3 (G01 LCI) Facelift 2021 M40i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW4 Series Convertible (G23)M440i5,500-6,500 rpm1,900-5,000 rpm6,750 rpm
BMWX3 (G01 LCI)Facelift 2021M40i5,200-6,500 rpm1,900-5,000 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW4 Series Convertible (G23)M440iBMWX3 (G01 LCI)Facelift 2021M40i
Acceleration checkpoints
0-60 mph
0-97 km/h
4.7 s
4.6 s
0-100 km/h
0-62 mph
4.9 s
4.9 s
0-200 km/h
0-124 mph
17.5 s
18.6 s
Top speed
Unrestricted
260 km/h162 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
5.7 s
5.6 s
1/8 mile
201 m
8.5 s
8.5 s
1000 ft
305 m
11.0 s
11.0 s
1/4 mile
402 m
13.0 s
13.1 s
Trap speed
1/4 mile
402 m
176 km/h
110 mph
173 km/h
108 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)M440i
374 hp
279 kW
BMWX3 (G01 LCI)Facelift 2021M40i
360 hp
268 kW

BMW 4 Series Convertible (G23) M440i has 14 hp more than BMW X3 (G01 LCI) Facelift 2021 M40i.

The biggest power difference is between BMW X3 (G01 LCI) Facelift 2021 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
BMW4 Series Convertible (G23)M440i
500 Nm
369 lb-ft
BMWX3 (G01 LCI)Facelift 2021M40i
500 Nm
369 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)M440i
1,890 kg
4,167 lb
BMWX3 (G01 LCI)Facelift 2021M40i
1,910 kg
4,211 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 Convertible (G23)M440i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMWX3 (G01 LCI)Facelift 2021M40i
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 Convertible (G23)M440i4.9 s
BMWX3 (G01 LCI)Facelift 2021M40i4.9 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 Convertible (G23)M440i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
BMWX3 (G01 LCI)Facelift 2021M40i
9.5 L/100 km
24.8 mpg US
29.7 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (G23) M440i and BMW X3 (G01 LCI) Facelift 2021 M40i: 2.1 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 Convertible (G23)M440i
198 hp/t
148 kW/t
5.1 kg/hp
BMWX3 (G01 LCI)Facelift 2021M40i
188 hp/t
141 kW/t
5.3 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (G23)M440i
797 km
495 mi
BMWX3 (G01 LCI)Facelift 2021M40i
684 km
425 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW4 Series Convertible (G23)M440i
374 hp
279 kW
4.9 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMWX3 (G01 LCI)Facelift 2021M40i
360 hp
268 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
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
BMWX3 (G01 LCI)Facelift 2021M40i
Power
360 hp
268 kW
0-100 km/h4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
5 doors
5 seats
Trunk
550 L
19.4 cu ft
Length
4,713 mm
185.6 in
Height
1,676 mm
66.0 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 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
BMWX3 (G01 LCI)Facelift 2021M40i
Power
360 hp
268 kW
0-100 km/h4.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
9.5 L/100 km
24.8 mpg US
29.7 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
BMW4 Series Convertible (G23)M440i
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
4.9 s
BMWX3 (G01 LCI)Facelift 2021M40i
9.5 L/100 km
24.8 mpg US
29.7 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
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
BMWX3 (G01 LCI)Facelift 2021M40i
188 hp/t
141 kW/t
5.3 kg/hp
9.5 L/100 km
24.8 mpg US
29.7 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW4 Series Convertible (G23)M440iBMWX3 (G01 LCI)Facelift 2021M40i
Power
374 hp
279 kW
360 hp
268 kW
Torque
500 Nm
369 lb-ft
500 Nm
369 lb-ft
Acceleration
4.9 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
1,890 kg
4,167 lb
1,910 kg
4,211 lb
Fuel consumption
7.4 L/100 km
31.8 mpg US
38.2 mpg UK
9.5 L/100 km
24.8 mpg US
29.7 mpg UK
Practicality
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
Doors/seats
5 doors
5 seats
Trunk
550 L
19.4 cu ft
Length
4,713 mm
185.6 in
Height
1,676 mm
66.0 in
Range score
797 km
495 mi
684 km
425 mi
Trunk score
300 L
10.6 cu ft
550 L
19.4 cu ft
Power-to-weight score
198 hp/t
148 kW/t
5.1 kg/hp
188 hp/t
141 kW/t
5.3 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 Convertible (G23) M440iBMW X3 (G01 LCI) Facelift 2021 M40i
Consumption7.4 L/100 km31.8 mpg US38.2 mpg UK9.5 L/100 km24.8 mpg US29.7 mpg UK
Cost / 100 km12.95 LC100 km16.63 LC100 km
Cost / 100 mi20.84 LC100 mi26.76 LC100 mi
Annual fuel used1,110 L293 US gal244 UK gal1,425 L376 US gal313 UK gal
Annual fuel cost1,943 LC/year2,494 LC/year

Head-to-head comparisons

BMW 4 Series Convertible (G23) M440i

  • Has 14 hp more
  • Is 20 kg lighter
  • Uses 2.1 L/100 km less fuel
  • Has 9 hp/t better power-to-weight
  • Has 113 km (70 mi) more estimated range

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Lightest
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Best estimated range

Cons

  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Convertible (G23) M440i
BMW X3 (G01 LCI) M40i
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BMW 4 Series Convertible (G23) M440i vs BMW X3 (G01 LCI) · Facelift 2021 M40i - car comparison - FastVsFaster