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Mercedes B Class vs Fiat 500 comparison

Compare performance (238 HP vs 118 HP), boot space and price (33,100 £ vs 17,100 £ ) at a glance. Find out which car is the better choice for you – Mercedes B Class or Fiat 500?

Mercedes B Class vs Fiat 500: Key differences

Mercedes B Class

4.9 (6 Reviews)
rate
  • significantly more power
  • very slightly more efficient
  • clearly quicker 0–100 km/h
  • clearly more trunk space
details

Fiat 500

3.7 (1 Reviews)
rate
  • significantly cheaper
  • noticeably lighter
details

All details on performance, efficiency, range and trunk space can be found in the technical comparison below – including user reviews for both models.

By Achim Sedelmaier

Here’s where it gets real: The technical differences in detail

B Class

Costs and Efficiency:

Price and efficiency are often the first things buyers look at. Here it becomes clear which model has the long-term edge – whether at the pump, the plug, or in purchase price.

Fiat 500 is significantly cheaper – starting at 17,100 £ , while the Mercedes B Class costs 33,100 £ . That’s a price difference of around 15,995 £.

Fuel consumption also shows a difference: the Mercedes B Class uses 5.1 L/100km and is very slightly more efficient than the Fiat 500 with 5.2 L/100km. The difference is about 0.1 L/100km.

500

Engine and Performance:

Under the bonnet, it becomes clear which model is tuned for sportiness and which one takes the lead when you hit the accelerator.

When it comes to engine power, the Mercedes B Class offers significantly more power – delivering 238 HP compared to 118 HP. That’s roughly 120 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes B Class is clearly quicker – completing the sprint in 6.5 s, while the Fiat 500 takes 9 s. That’s about 2.5 s quicker.

There’s also a difference in torque: the Mercedes B Class delivers considerably more torque with 400 Nm compared to 220 Nm. That’s about 180 Nm more.

B Class

Space and Everyday Use:

Whether family car or daily driver – which one offers more room, flexibility and comfort?

Seats: Mercedes B Class offers more seats – 5 vs 4.

In terms of curb weight, Fiat 500 is noticeably lighter – 1,130 kg compared to 1,405 kg. The difference is around 275 kg.

Looking at boot space, the Mercedes B Class offers clearly more boot space – 455 L compared to 185 L. That’s a difference of about 270 L.

When it comes to payload, the Mercedes B Class carries clearly more – 550 kg compared to 325 kg. That’s a difference of about 225 kg.

Who wins the race in the data check?

The Mercedes B Class is decisively ahead in the objective data comparison.
This result only shows which model scores more points on paper – not which of the two cars feels right for you.

from £33,100
B Class

Mercedes B Class

  • Engine Type Petrol MHEV, Diesel
  • Transmission Automatic
  • Drive Type Front-Wheel Drive, All-Wheel Drive
  • Power HP 116 - 238 HP
  • Consumption L/100km 5.1 - 6.9 L/100km
details

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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Mercedes B Class

The Mercedes B-Class is a smart, grown-up compact people carrier that dresses everyday practicality in a near‑premium polish, perfect for buyers who want comfort and a classy badge without the theatrics. It won’t set your pulse racing on a back road, but it will make school runs, commutes and grocery hauls feel pleasantly civilized — a reliable, slightly posh companion for real life.

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18C0953_005
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Reviews Mercedes B Class

4.9 (6 Reviews)
rate
SiBa
31 Jul 2026, 14:51:34

We've been driving only the B180D automatic for 9 years — there's nothing better. Great on long trips; the next one will be another B180D automatic.

How do you mainly use this car? (optional): Family car
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Safety
Practicality / Trunk & Everyday Use
Value for Money
Peter
5 Mar 2026, 05:51:19

My wife and I have been driving a Mercedes W247 200d for seven years now, with 93,000 km on the clock. The car is very comfortable even on long trips and economical. At the last service the pads of the electric parking brake were replaced; otherwise no repairs. We love this car.

How do you mainly use this car? (optional): Family car
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money

Fiat 500

The Fiat 500 is a cheeky, retro‑styled city car that turns heads with its iconic looks and playful personality. Perfect for weaving through tight streets and easing into tiny parking spots, it’s aimed at buyers who want style and character more than grand touring prowess.

details
190624_F_500_Lounge_MY2020_06
190624_F_500_Lounge_MY2020_10
190624_F_500_Lounge_MY2020_03

Reviews Fiat 500

3.7 (1 Reviews)
rate
Reijo Muhonen
28 Feb 2026, 16:46:06

I've owned both cars, and I still end up with the Fiat 500 — it always puts me in a good mood. For longer trips I take the train.

How do you mainly use this car? (optional): City / Short distance
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money

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Mercedes B Class
Fiat 500

Costs and Consumption
Price
33,100 - 52,500 £
Price
17,100 - 27,400 £
Consumption L/100km
5.1 - 6.9 L/100km
Consumption L/100km
5.2 - 5.3 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
13 - 14.7 kWh/100km
Electric Range
-
Electric Range
190 - 331 km
Battery Capacity
-
Battery Capacity
-
co2
133 - 156 g/km
co2
0 - 121 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
MPV
Body Type
Hatchback
Seats
5
Seats
4
Doors
-
Doors
-
Curb weight
1,405 - 1,565 kg
Curb weight
1,130 - 1,475 kg
Trunk capacity
445 - 455 L
Trunk capacity
183 - 185 L
Length
-
Length
-
Width
1,796 mm
Width
1,683 - 1,684 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
515 - 550 kg
Payload
250 - 325 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel
Engine Type
Electric, Petrol MHEV
Transmission
Automatic
Transmission
Automatic, Manuel
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Reduction Gearbox, Manual Gearbox
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Front-Wheel Drive
Power HP
116 - 238 HP
Power HP
65 - 118 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
9 - 16.2 s
Max Speed
-
Max Speed
-
Torque
200 - 400 Nm
Torque
92 - 220 Nm
Number of Cylinders
4
Number of Cylinders
3
Power kW
85 - 175 kW
Power kW
48 - 87 kW
Engine capacity
1,332 - 1,991 cm3
Engine capacity
999 cm3

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
D, E, F
CO2 Efficiency Class
A, D
Brand
Mercedes-Benz
Brand
Fiat
What drivetrain options does the Mercedes B Class have?

Available configurations include Front-Wheel Drive or All-Wheel Drive.

DriveDuel uses data analysis and artificial intelligence to evaluate vehicle data and create content. Content is regularly reviewed and improved. The displayed prices are estimates based on German list prices, adjusted to the respective country’s VAT. Country-specific registration taxes are not included. This information is not legally binding.