Car comparison

BMW 4 Series Convertible (F33) 428ivsBMW 1 Series Convertible (E88) 125i

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

New comparison

BMW 4 Series Convertible (F33)

428i

245 hp1997 ccGasolineRWDManualTurbochargedCabriolet / convertible2014-2016
VS

BMW 1 Series Convertible (E88)

125i

218 hp2996 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2008-2011

Comparison overview

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

Best choices

BMW 4 Series Convertible (F33) 428i

  • Quickest 0-100 km/h
    6.4 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    245 hp
    183 kW
  • Highest torque
    350 Nm
    258 lb-ft
  • Best power-to-weight
    146 hp/t
    109 kW/t
    6.9 kg/hp
  • Lowest combined fuel consumption
    6.8 L/100 km
    34.6 mpg US
    41.5 mpg UK
  • Lowest city consumption
    8.8 L/100 km
    26.7 mpg US
    32.1 mpg UK
  • Lowest highway consumption
    5.7 L/100 km
    41.3 mpg US
    49.6 mpg UK
  • Lowest CO2 emissions
    159 g/km
  • Best estimated range
    882 km
    548 mi
  • Best overall score
    54/100
  • Best performance score
    59/100
  • Best economy score
    89/100

Specification comparison

Specification comparison
ModelBMW4 Series Convertible (F33)428iBMW1 Series Convertible (E88)125i
Power
245hp183kW
218hp163kW
Torque
350Nm258lb-ft
270Nm199lb-ft
Curb weight
1,680kg3,704lb
1,510kg3,329lb
Gross weight
2,140kg4,718lb
1,950kg4,299lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
238 km/h
148 mph
To 99% top speed
93.9s99% target: 257 km/h / 160 mph
Calculated
88.5s99% target: 236 km/h / 146 mph
Calculated
0-100 km/h
6.4s
6.8s
0-200 km/h
24.0s
Calculated
29.3s
Calculated
0-60 mph
6.1s
Calculated
6.4s
Calculated
Fuel consumption
6.8L/100 km34.6mpg US41.5mpg UK
8.1L/100 km29mpg US34.9mpg UK
Fuel consumption city
8.8L/100 km26.7mpg US32.1mpg UK
11.7L/100 km20.1mpg US24.1mpg UK
Fuel consumption highway
5.7L/100 km41.3mpg US49.6mpg UK
6L/100 km39.2mpg US47.1mpg UK
Quarter mile
14.5s
Calculated
14.8s
Calculated
Power-to-weight
146hp/t109kW/t66hp/1000 lb
Calculated
144hp/t108kW/t65hp/1000 lb
Calculated
Torque-to-weight
208Nm/t139lb-ft/ton
Calculated
179Nm/t120lb-ft/ton
Calculated
Estimated range
882km548mi
Calculated
654km407mi
Calculated
Displacement
1,997cc122cu in
2,996cc183cu in
Length
4,638mm183in
4,360mm172in
Width
1,825mm72in
1,748mm69in
Height
1,384mm54in
1,411mm56in
Wheelbase
2,810mm111in
2,660mm105in
Front track
1,545mm61in
1,474mm58in
Rear track
1,594mm63in
1,507mm59in
Ground clearance
130mm5in
140mm6in
Trunk volume
220L
260L
Max trunk volume
370L
305L
Doors
2
2
Seats
4
4
Fuel tank
60L
53L
CO2 emissions
159g/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) 428iBMW 1 Series Convertible (E88) 125iPowerTorque
  • BMW 4 Series Convertible (F33) 428i: Power / Torque
  • BMW 1 Series Convertible (E88) 125i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW4 Series Convertible (F33)428i5,000-6,500 rpm1,250-4,800 rpm6,750 rpm
BMW1 Series Convertible (E88)125i6,100 rpm2,500-4,250 rpm6,350 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW4 Series Convertible (F33)428iBMW1 Series Convertible (E88)125i
Acceleration checkpoints
0-60 mph
0-97 km/h
6.1 s
6.4 s
0-100 km/h
0-62 mph
6.4 s
6.8 s
0-200 km/h
0-124 mph
24.0 s
29.3 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
238 km/h
148 mph
Drag race simulation
60 ft
18 m
2.4 s
2.4 s
330 ft
101 m
6.3 s
6.4 s
1/8 mile
201 m
9.5 s
9.7 s
1000 ft
305 m
12.2 s
12.5 s
1/4 mile
402 m
14.5 s
14.8 s
Trap speed
1/4 mile
402 m
161 km/h
100 mph
154 km/h
96 mph

Power comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)428i
245 hp
183 kW
BMW1 Series Convertible (E88)125i
218 hp
163 kW

BMW 4 Series Convertible (F33) 428i has 27 hp more than BMW 1 Series Convertible (E88) 125i.

The biggest power difference is between BMW 1 Series Convertible (E88) 125i and BMW 4 Series Convertible (F33) 428i: 27 hp (20 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)428i
350 Nm
258 lb-ft
BMW1 Series Convertible (E88)125i
270 Nm
199 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)428i
1,680 kg
3,704 lb
BMW1 Series Convertible (E88)125i
1,510 kg
3,329 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)428i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW1 Series Convertible (E88)125i
238 km/h
148 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)428i6.4 s
BMW1 Series Convertible (E88)125i6.8 s

The biggest 0-100 km/h difference is between BMW 4 Series Convertible (F33) 428i and BMW 1 Series Convertible (E88) 125i: 0.4 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)428i
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
BMW1 Series Convertible (E88)125i
8.1 L/100 km
29.0 mpg US
34.9 mpg UK

The biggest fuel consumption difference is between BMW 4 Series Convertible (F33) 428i and BMW 1 Series Convertible (E88) 125i: 1.3 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)428i
146 hp/t
109 kW/t
6.9 kg/hp
BMW1 Series Convertible (E88)125i
144 hp/t
108 kW/t
6.9 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW4 Series Convertible (F33)428i
882 km
548 mi
BMW1 Series Convertible (E88)125i
654 km
407 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW4 Series Convertible (F33)428i
245 hp
183 kW
6.4 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW1 Series Convertible (E88)125i
218 hp
163 kW
6.8 s
238 km/h
148 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)428i
Power
245 hp
183 kW
0-100 km/h6.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
220 L
7.8 cu ft
Length
4,638 mm
182.6 in
Height
1,384 mm
54.5 in
BMW1 Series Convertible (E88)125i
Power
218 hp
163 kW
0-100 km/h6.8 s
Top speed
238 km/h
148 mph
Doors/seats
2 doors
4 seats
Trunk
260 L
9.2 cu ft
Length
4,360 mm
171.7 in
Height
1,411 mm
55.6 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)428i
Power
245 hp
183 kW
0-100 km/h6.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
BMW1 Series Convertible (E88)125i
Power
218 hp
163 kW
0-100 km/h6.8 s
Top speed
238 km/h
148 mph
8.1 L/100 km
29.0 mpg US
34.9 mpg UK

BMW 4 Series Convertible (F33) 428i 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)428i
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
6.4 s
BMW1 Series Convertible (E88)125i
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
6.8 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)428i
146 hp/t
109 kW/t
6.9 kg/hp
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
BMW1 Series Convertible (E88)125i
144 hp/t
108 kW/t
6.9 kg/hp
8.1 L/100 km
29.0 mpg US
34.9 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW4 Series Convertible (F33)428iBMW1 Series Convertible (E88)125i
Power
245 hp
183 kW
218 hp
163 kW
Torque
350 Nm
258 lb-ft
270 Nm
199 lb-ft
Acceleration
6.4 s
6.8 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
238 km/h
148 mph
Lightness
1,680 kg
3,704 lb
1,510 kg
3,329 lb
Fuel consumption
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
8.1 L/100 km
29.0 mpg US
34.9 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
220 L
7.8 cu ft
Length
4,638 mm
182.6 in
Height
1,384 mm
54.5 in
Doors/seats
2 doors
4 seats
Trunk
260 L
9.2 cu ft
Length
4,360 mm
171.7 in
Height
1,411 mm
55.6 in
Range score
882 km
548 mi
654 km
407 mi
CO2 score
159 g/km
195 g/km
Trunk score
220 L
7.8 cu ft
260 L
9.2 cu ft
Power-to-weight score
146 hp/t
109 kW/t
6.9 kg/hp
144 hp/t
108 kW/t
6.9 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) 428iBMW 1 Series Convertible (E88) 125i
Consumption6.8 L/100 km34.6 mpg US41.5 mpg UK8.1 L/100 km29 mpg US34.9 mpg UK
Cost / 100 km11.90 LC100 km14.17 LC100 km
Cost / 100 mi19.15 LC100 mi22.81 LC100 mi
Annual fuel used1,020 L269 US gal224 UK gal1,215 L321 US gal267 UK gal
Annual fuel cost1,785 LC/year2,126 LC/year

Head-to-head comparisons

BMW 4 Series Convertible (F33) 428i

  • Has 27 hp more
  • Has 80 Nm more
  • Is 0.4 s quicker from 0-100 km/h
  • Has 22 km/h (14 mph) higher top speed
  • Uses 1.3 L/100 km less fuel
  • Has 1 hp/t better power-to-weight
  • Has 228 km (142 mi) more estimated range
  • Emits 36 g/km less CO2

Pros

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

Cons

  • Heaviest
  • Smallest trunk

BMW 1 Series Convertible (E88) 125i

  • Is 170 kg lighter
  • Has 40 L more trunk volume

Pros

  • Lightest
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Highest combined fuel consumption
  • Lowest top speed
  • Highest CO2 emissions

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 4 Series Convertible (F33) 428i
BMW 1 Series Convertible (E88) 125i
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