Car comparison

BMW 2 Series Convertible (F23) M235ivsBMW 6 Series Convertible (F12) 640i

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

New comparison

BMW 2 Series Convertible (F23)

M235i

326 hp2979 ccGasolineRWDManualTurbochargedCabriolet / convertible2015-2016
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 2 Series Convertible (F23) M235i

  • Quickest 0-100 km/h
    5.2 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
    1,600 kg
    3,527 lb
  • Best power-to-weight
    204 hp/t
    152 kW/t
    4.9 kg/hp
  • Best overall score
    60/100
  • Best performance score
    68/100
  • Best economy score
    84/100

BMW 6 Series Convertible (F12) 640i

  • Lowest combined fuel consumption
    8.4 L/100 km
    28.0 mpg US
    33.6 mpg UK
  • Lowest city consumption
    11.4 L/100 km
    20.6 mpg US
    24.8 mpg UK
  • Lowest highway consumption
    6.6 L/100 km
    35.6 mpg US
    42.8 mpg UK
  • Lowest CO2 emissions
    195 g/km
  • Best estimated range
    833 km
    518 mi
  • Largest trunk
    300 L
  • Best practicality score
    45/100

Specification comparison

Specification comparison
ModelBMW2 Series Convertible (F23)M235iBMW6 Series Convertible (F12)640i
Power
326hp243kW
320hp239kW
Torque
450Nm332lb-ft
450Nm332lb-ft
Curb weight
1,600kg3,527lb
1,910kg4,211lb
Gross weight
2,030kg4,475lb
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
71.7s99% target: 257 km/h / 160 mph
Calculated
80.0s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.2s
5.4s
0-200 km/h
18.9s
Calculated
20.3s
Calculated
0-60 mph
4.9s
Calculated
5.1s
Calculated
Fuel consumption
8.5L/100 km27.7mpg US33.2mpg UK
8.4L/100 km28mpg US33.6mpg UK
Fuel consumption city
11.5L/100 km20.5mpg US24.6mpg UK
11.4L/100 km20.6mpg US24.8mpg UK
Fuel consumption highway
6.8L/100 km34.6mpg US41.5mpg UK
6.6L/100 km35.6mpg US42.8mpg UK
Quarter mile
13.3s
Calculated
13.6s
Calculated
Power-to-weight
204hp/t152kW/t92hp/1000 lb
Calculated
168hp/t125kW/t76hp/1000 lb
Calculated
Torque-to-weight
281Nm/t188lb-ft/ton
Calculated
236Nm/t158lb-ft/ton
Calculated
Estimated range
612km380mi
Calculated
833km518mi
Calculated
Displacement
2,979cc182cu in
2,979cc182cu in
Length
4,454mm175in
4,894mm193in
Width
1,774mm70in
1,894mm75in
Height
1,403mm55in
1,365mm54in
Wheelbase
2,690mm106in
2,855mm112in
Front track
1,516mm60in
1,600mm63in
Rear track
1,534mm60in
1,665mm66in
Ground clearance
130mm5in
123mm5in
Trunk volume
280L
300L
Max trunk volume
335L
350L
Doors
2
2
Seats
4
4
Fuel tank
52L
70L
CO2 emissions
199g/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 2 Series Convertible (F23) M235iBMW 6 Series Convertible (F12) 640iPowerTorque
  • BMW 2 Series Convertible (F23) M235i: Power / Torque
  • BMW 6 Series Convertible (F12) 640i: 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
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
MetricBMW2 Series Convertible (F23)M235iBMW6 Series Convertible (F12)640i
Acceleration checkpoints
0-60 mph
0-97 km/h
4.9 s
5.1 s
0-100 km/h
0-62 mph
5.2 s
5.4 s
0-200 km/h
0-124 mph
18.9 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
5.8 s
5.8 s
1/8 mile
201 m
8.7 s
8.8 s
1000 ft
305 m
11.2 s
11.4 s
1/4 mile
402 m
13.3 s
13.6 s
Trap speed
1/4 mile
402 m
173 km/h
107 mph
169 km/h
105 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
BMW6 Series Convertible (F12)640i
320 hp
239 kW

BMW 2 Series Convertible (F23) M235i 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 2 Series Convertible (F23) M235i: 6 hp (4 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
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
BMW2 Series Convertible (F23)M235i
1,600 kg
3,527 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
BMW2 Series Convertible (F23)M235i
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
BMW2 Series Convertible (F23)M235i5.2 s
BMW6 Series Convertible (F12)640i5.4 s

The biggest 0-100 km/h difference is between BMW 2 Series Convertible (F23) M235i and BMW 6 Series Convertible (F12) 640i: 0.2 s.

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
8.5 L/100 km
27.7 mpg US
33.2 mpg UK
BMW6 Series Convertible (F12)640i
8.4 L/100 km
28.0 mpg US
33.6 mpg UK

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
204 hp/t
152 kW/t
4.9 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
BMW2 Series Convertible (F23)M235i
612 km
380 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
BMW2 Series Convertible (F23)M235i
326 hp
243 kW
5.2 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
BMW2 Series Convertible (F23)M235i
Power
326 hp
243 kW
0-100 km/h5.2 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
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
BMW2 Series Convertible (F23)M235i
Power
326 hp
243 kW
0-100 km/h5.2 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
8.5 L/100 km
27.7 mpg US
33.2 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 2 Series Convertible (F23) M235i 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
8.5 L/100 km
27.7 mpg US
33.2 mpg UK
5.2 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
BMW2 Series Convertible (F23)M235i
204 hp/t
152 kW/t
4.9 kg/hp
8.5 L/100 km
27.7 mpg US
33.2 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
VehicleBMW2 Series Convertible (F23)M235iBMW6 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
5.2 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
1,600 kg
3,527 lb
1,910 kg
4,211 lb
Fuel consumption
8.5 L/100 km
27.7 mpg US
33.2 mpg UK
8.4 L/100 km
28.0 mpg US
33.6 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
4,894 mm
192.7 in
Height
1,365 mm
53.7 in
Range score
612 km
380 mi
833 km
518 mi
CO2 score
199 g/km
195 g/km
Trunk score
280 L
9.9 cu ft
300 L
10.6 cu ft
Power-to-weight score
204 hp/t
152 kW/t
4.9 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 2 Series Convertible (F23) M235iBMW 6 Series Convertible (F12) 640i
Consumption8.5 L/100 km27.7 mpg US33.2 mpg UK8.4 L/100 km28 mpg US33.6 mpg UK
Cost / 100 km14.88 LC100 km14.70 LC100 km
Cost / 100 mi23.94 LC100 mi23.66 LC100 mi
Annual fuel used1,275 L337 US gal280 UK gal1,260 L333 US gal277 UK gal
Annual fuel cost2,231 LC/year2,205 LC/year

Head-to-head comparisons

BMW 2 Series Convertible (F23) M235i

  • Has 6 hp more
  • Is 310 kg lighter
  • Is 0.2 s quicker from 0-100 km/h
  • Has 36 hp/t better power-to-weight

Pros

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

Cons

  • Highest combined fuel consumption
  • Smallest trunk
  • Highest CO2 emissions

BMW 6 Series Convertible (F12) 640i

  • Uses 0.1 L/100 km less fuel
  • Has 222 km (138 mi) more estimated range
  • Has 20 L more trunk volume
  • Emits 4 g/km less CO2

Pros

  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Heaviest

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 2 Series Convertible (F23) M235i
BMW 6 Series Convertible (F12) 640i
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