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Kia Niro vs Mercedes B Class comparison

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

Kia Niro vs Mercedes B Class: Key differences

Kia Niro

4.5 (3 Reviews)
rate
  • a bit cheaper
  • moderately more efficient
details

Mercedes B Class

4.9 (5 Reviews)
rate
  • considerably more power
  • clearly quicker 0–100 km/h
  • marginally lighter
  • very slightly more trunk space
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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

Niro

Costs and Efficiency:

Looking at overall running costs, both models reveal some interesting differences in everyday economy.

Kia Niro is a bit 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 moderately more efficient than the Mercedes B Class with 5.1 L/100km. The difference is about 0.6 L/100km.

B Class

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 noticeably more torque with 400 Nm compared to 265 Nm. That’s about 135 Nm more.

Niro

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 very slightly 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 a bit 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 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
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Frequently compared as well

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Mercedes B Class
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Kia Niro
Mercedes B Class

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

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.

details
Kia_Niro_HEV_08
Kia_Niro_HEV_24
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Kia_Niro_HEV_05
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Reviews Kia Niro

4.5 (3 Reviews)
rate
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.

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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18C0947_011
18C0947_009
18C0953_005
18C0953_035
18C0947_044

Reviews Mercedes B Class

4.9 (5 Reviews)
rate
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

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The Kia Niro feels like the sensible crossover hero — roomy, composed and blessed with a polished hybrid system that trims fuel bills without stripping comfort. The Toyota Yaris Cross is smaller and cheekier, nailing city agility and frugal running costs, so pick the Niro for family practicality …
Kia Niro
Mercedes B Class

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

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

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

General
Model Year
2025
Model Year
2025
CO2 Efficiency Class
C
CO2 Efficiency Class
D, E, F
Brand
Kia
Brand
Mercedes-Benz
What drive types are available for the Kia Niro?

The Kia Niro is offered with Front-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.