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Mercedes B Class vs Kia Niro comparison

Compare performance (238 HP vs 138 HP), boot space and price (33,100 £ vs 29,100 £ ) at a glance. Find out which car is the better choice for you – Mercedes B Class or Kia Niro?

Mercedes B Class vs Kia Niro: Key differences

Mercedes B Class

4.9 (6 Reviews)
rate
  • considerably more power
  • clearly quicker 0–100 km/h
  • marginally lighter
  • barely more trunk space
details

Kia Niro

4.6 (4 Reviews)
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  • slightly cheaper
  • somewhat more efficient
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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 key factors when choosing a car – and this is often where the real differences emerge.

Kia Niro is slightly cheaper – starting at 29,100 £ , while the Mercedes B Class costs 33,100 £ . That’s a price difference of around 3,995 £.

Fuel consumption also shows a difference: the Kia Niro uses 4.5 L/100km and is somewhat more efficient than the Mercedes B Class with 5.1 L/100km. The difference is about 0.6 L/100km.

Niro

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 considerably more power – delivering 238 HP compared to 138 HP. That’s roughly 100 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 Kia Niro takes 11.1 s. That’s about 4.6 s quicker.

There’s also a difference in torque: the Mercedes B Class delivers visibly more torque with 400 Nm compared to 265 Nm. That’s about 135 Nm more.

B Class

Space and Everyday Use:

Cabin size, boot volume and payload all play a role in everyday practicality. Here, comfort and flexibility make the difference.

Both vehicles offer seating for 5 people.

In terms of curb weight, Mercedes B Class is marginally lighter – 1,405 kg compared to 1,474 kg. The difference is around 69 kg.

Looking at boot space, the Mercedes B Class offers barely more boot space – 455 L compared to 451 L. That’s a difference of about 4 L.

When it comes to payload, the Mercedes B Class carries somewhat more – 550 kg compared to 466 kg. That’s a difference of about 84 kg.

Who wins the race in the data check?

The Mercedes B Class stands well ahead of its rival 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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Mercedes B Class
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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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Reviews Mercedes B Class

4.9 (6 Reviews)
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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

Kia Niro

The Kia Niro is a practical crossover that blends economy and everyday versatility without sacrificing comfort. With a roomy, well-laid-out cabin and calm, composed handling, it’s an easy-to-live-with choice for commuters and families.

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Reviews Kia Niro

4.6 (4 Reviews)
rate
pip
11 Jul 2026, 08:42:12

nice size, roomy for passengers, lots of bells and whistles as standard, magnificent fuel economy,well made , 7 year warranty

How do you mainly use this car? (optional): Family car
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Comfort & Interior
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Archi
25 Mar 2026, 13:11:41

Efficient, functional, understated, spacious and comfortable. No surprises: it delivers what it promises and does its job without fanfare. Good buy.

How do you mainly use this car? (optional): Leisure / Weekend driver
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Wolfgang Schäfer
21 Oct 2025, 14:01:32

I've been driving the Kia Niro since 2019 and am still very happy with this car.

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Mercedes B Class
Kia Niro

Costs and Consumption
Price
33,100 - 52,500 £
Price
29,100 - 33,800 £
Consumption L/100km
5.1 - 6.9 L/100km
Consumption L/100km
4.5 - 4.9 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
133 - 156 g/km
co2
102 - 111 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
MPV
Body Type
SUV
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,405 - 1,565 kg
Curb weight
1,474 kg
Trunk capacity
445 - 455 L
Trunk capacity
451 L
Length
-
Length
-
Width
1,796 mm
Width
1,825 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
515 - 550 kg
Payload
466 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel
Engine Type
Full Hybrid
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Dual-Clutch Automatic
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Front-Wheel Drive
Power HP
116 - 238 HP
Power HP
138 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
11.1 - 11.4 s
Max Speed
-
Max Speed
-
Torque
200 - 400 Nm
Torque
265 Nm
Number of Cylinders
4
Number of Cylinders
4
Power kW
85 - 175 kW
Power kW
102 kW
Engine capacity
1,332 - 1,991 cm3
Engine capacity
1,580 cm3

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
D, E, F
CO2 Efficiency Class
C
Brand
Mercedes-Benz
Brand
Kia
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.