Car comparison

BMW 4 Series Convertible (F33) 440ivsBMW 6 Series Convertible (F12) 640i

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

New comparison

BMW 4 Series Convertible (F33)

440i

326 hp2998 ccGasolineAWDAutomaticTurbochargedCabriolet / convertible2016-2016
VS

BMW 6 Series Convertible (F12)

640i

320 hp2979 ccGasolineAWDAutomaticTurbochargedCabriolet / convertible2013-2015

Comparison overview

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

Best choices

BMW 4 Series Convertible (F33) 440i

  • Quickest 0-100 km/h
    5.4 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    326 hp
    243 kW
  • Highest torque
    450 Nm
    332 lb-ft
  • Lightest
    1,850 kg
    4,079 lb
  • Best power-to-weight
    176 hp/t
    131 kW/t
    5.7 kg/hp
  • Lowest combined fuel consumption
    7.6 L/100 km
    30.9 mpg US
    37.2 mpg UK
  • Lowest city consumption
    10.3 L/100 km
    22.8 mpg US
    27.4 mpg UK
  • Lowest highway consumption
    6.1 L/100 km
    38.6 mpg US
    46.3 mpg UK
  • Lowest CO2 emissions
    177 g/km
  • Largest trunk
    370 L
  • Best overall score
    61/100
  • Best performance score
    67/100
  • Best economy score
    86/100
  • Best practicality score
    48/100

Specification comparison

Specification comparison
ModelBMW4 Series Convertible (F33)440iBMW6 Series Convertible (F12)640i
Power
326hp243kW
320hp239kW
Torque
450Nm332lb-ft
450Nm332lb-ft
Curb weight
1,850kg4,079lb
1,910kg4,211lb
Gross weight
2,300kg5,071lb
2,400kg5,291lb
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
77.9s99% target: 257 km/h / 160 mph
Calculated
80.0s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.4s
5.4s
0-200 km/h
20.1s
Calculated
20.3s
Calculated
0-60 mph
5.1s
Calculated
5.1s
Calculated
Fuel consumption
7.6L/100 km30.9mpg US37.2mpg UK
8.4L/100 km28mpg US33.6mpg UK
Fuel consumption city
10.3L/100 km22.8mpg US27.4mpg UK
11.4L/100 km20.6mpg US24.8mpg UK
Fuel consumption highway
6.1L/100 km38.6mpg US46.3mpg UK
6.6L/100 km35.6mpg US42.8mpg UK
Quarter mile
13.6s
Calculated
13.6s
Calculated
Power-to-weight
176hp/t131kW/t80hp/1000 lb
Calculated
168hp/t125kW/t76hp/1000 lb
Calculated
Torque-to-weight
243Nm/t163lb-ft/ton
Calculated
236Nm/t158lb-ft/ton
Calculated
Estimated range
789km491mi
Calculated
833km518mi
Calculated
Displacement
2,998cc183cu in
2,979cc182cu in
Length
4,638mm183in
4,894mm193in
Width
1,825mm72in
1,894mm75in
Height
1,399mm55in
1,365mm54in
Wheelbase
2,810mm111in
2,855mm112in
Front track
1,544mm61in
1,600mm63in
Rear track
1,590mm63in
1,665mm66in
Ground clearance
145mm6in
123mm5in
Trunk volume
370L
300L
Max trunk volume-
350L
Doors
2
2
Seats
4
4
Fuel tank
60L
70L
CO2 emissions
177g/km
195g/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 4 Series Convertible (F33) 440iBMW 6 Series Convertible (F12) 640iPowerTorque
  • BMW 4 Series Convertible (F33) 440i: Power / Torque
  • BMW 6 Series Convertible (F12) 640i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW4 Series Convertible (F33)440i5,500 rpm1,380-5,000 rpm5,750 rpm
BMW6 Series Convertible (F12)640i5,800-6,000 rpm1,300-4,500 rpm6,250 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW4 Series Convertible (F33)440iBMW6 Series Convertible (F12)640i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.1 s
5.1 s
0-100 km/h
0-62 mph
5.4 s
5.4 s
0-200 km/h
0-124 mph
20.1 s
20.3 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
Likely limited
Drag race simulation
60 ft
18 m
2.2 s
2.2 s
330 ft
101 m
5.9 s
5.8 s
1/8 mile
201 m
8.8 s
8.8 s
1000 ft
305 m
11.4 s
11.4 s
1/4 mile
402 m
13.6 s
13.6 s
Trap speed
1/4 mile
402 m
169 km/h
105 mph
169 km/h
105 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)440i
326 hp
243 kW
BMW6 Series Convertible (F12)640i
320 hp
239 kW

BMW 4 Series Convertible (F33) 440i has 6 hp more than BMW 6 Series Convertible (F12) 640i.

The biggest power difference is between BMW 6 Series Convertible (F12) 640i and BMW 4 Series Convertible (F33) 440i: 6 hp (4 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)440i
450 Nm
332 lb-ft
BMW6 Series Convertible (F12)640i
450 Nm
332 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)440i
1,850 kg
4,079 lb
BMW6 Series Convertible (F12)640i
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 (F33)440i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (F12)640i
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 (F33)440i5.4 s
BMW6 Series Convertible (F12)640i5.4 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 (F33)440i
7.6 L/100 km
30.9 mpg US
37.2 mpg UK
BMW6 Series Convertible (F12)640i
8.4 L/100 km
28.0 mpg US
33.6 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (F33) 440i and BMW 6 Series Convertible (F12) 640i: 0.8 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 (F33)440i
176 hp/t
131 kW/t
5.7 kg/hp
BMW6 Series Convertible (F12)640i
168 hp/t
125 kW/t
6.0 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)440i
789 km
491 mi
BMW6 Series Convertible (F12)640i
833 km
518 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW4 Series Convertible (F33)440i
326 hp
243 kW
5.4 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (F12)640i
320 hp
239 kW
5.4 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 (F33)440i
Power
326 hp
243 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
370 L
13.1 cu ft
Length
4,638 mm
182.6 in
Height
1,399 mm
55.1 in
BMW6 Series Convertible (F12)640i
Power
320 hp
239 kW
0-100 km/h5.4 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
4,894 mm
192.7 in
Height
1,365 mm
53.7 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 (F33)440i
Power
326 hp
243 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
7.6 L/100 km
30.9 mpg US
37.2 mpg UK
BMW6 Series Convertible (F12)640i
Power
320 hp
239 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
8.4 L/100 km
28.0 mpg US
33.6 mpg UK

BMW 4 Series Convertible (F33) 440i 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 (F33)440i
7.6 L/100 km
30.9 mpg US
37.2 mpg UK
5.4 s
BMW6 Series Convertible (F12)640i
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
5.4 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 (F33)440i
176 hp/t
131 kW/t
5.7 kg/hp
7.6 L/100 km
30.9 mpg US
37.2 mpg UK
BMW6 Series Convertible (F12)640i
168 hp/t
125 kW/t
6.0 kg/hp
8.4 L/100 km
28.0 mpg US
33.6 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW4 Series Convertible (F33)440iBMW6 Series Convertible (F12)640i
Power
326 hp
243 kW
320 hp
239 kW
Torque
450 Nm
332 lb-ft
450 Nm
332 lb-ft
Acceleration
5.4 s
5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,850 kg
4,079 lb
1,910 kg
4,211 lb
Fuel consumption
7.6 L/100 km
30.9 mpg US
37.2 mpg UK
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
370 L
13.1 cu ft
Length
4,638 mm
182.6 in
Height
1,399 mm
55.1 in
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,894 mm
192.7 in
Height
1,365 mm
53.7 in
Range score
789 km
491 mi
833 km
518 mi
CO2 score
177 g/km
195 g/km
Trunk score
370 L
13.1 cu ft
300 L
10.6 cu ft
Power-to-weight score
176 hp/t
131 kW/t
5.7 kg/hp
168 hp/t
125 kW/t
6.0 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 (F33) 440iBMW 6 Series Convertible (F12) 640i
Consumption7.6 L/100 km30.9 mpg US37.2 mpg UK8.4 L/100 km28 mpg US33.6 mpg UK
Cost / 100 km13.30 LC100 km14.70 LC100 km
Cost / 100 mi21.40 LC100 mi23.66 LC100 mi
Annual fuel used1,140 L301 US gal251 UK gal1,260 L333 US gal277 UK gal
Annual fuel cost1,995 LC/year2,205 LC/year

Head-to-head comparisons

BMW 4 Series Convertible (F33) 440i

  • Has 6 hp more
  • Is 60 kg lighter
  • Uses 0.8 L/100 km less fuel
  • Has 9 hp/t better power-to-weight
  • Has 70 L more trunk volume
  • Emits 18 g/km less CO2

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
  • Largest trunk

BMW 6 Series Convertible (F12) 640i

  • Has 44 km (27 mi) more estimated range

Pros

  • Best estimated range

Cons

  • Lowest power
  • Highest combined fuel consumption
  • Heaviest
  • Smallest trunk
  • Highest CO2 emissions

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Convertible (F33) 440i
BMW 6 Series Convertible (F12) 640i
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