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Mercedes B Class vs Kia K4 comparison

Compare performance (238 HP vs 180 HP), boot space and price (33,100 £ vs 24,800 £ ) at a glance. Find out which car is the better choice for you – Mercedes B Class or Kia K4?

Mercedes B Class vs Kia K4: Key differences

Mercedes B Class

4.9 (5 Reviews)
rate
  • markedly more power
  • moderately more efficient
  • clearly quicker 0–100 km/h
  • marginally lighter
details

Kia K4

4.4 (6 Reviews)
rate
  • clearly cheaper
  • markedly more trunk space
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 key factors when choosing a car – and this is often where the real differences emerge.

Kia K4 is clearly cheaper – starting at 24,800 £ , while the Mercedes B Class costs 33,100 £ . That’s a price difference of around 8,367 £.

Fuel consumption also shows a difference: the Mercedes B Class uses 5.1 L/100km and is moderately more efficient than the Kia K4 with 5.8 L/100km. The difference is about 0.7 L/100km.

K4

Engine and Performance:

Power, torque and acceleration are the classic benchmarks for car enthusiasts – and here, some clear differences start to show.

When it comes to engine power, the Mercedes B Class offers markedly more power – delivering 238 HP compared to 180 HP. That’s roughly 58 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 K4 takes 8.4 s. That’s about 1.9 s quicker.

There’s also a difference in torque: the Mercedes B Class delivers markedly 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 1,415 kg. The difference is around 10 kg.

Looking at boot space, the Kia K4 offers markedly more boot space – 604 L compared to 455 L. That’s a difference of about 149 L.

When it comes to payload, the Mercedes B Class carries moderately more – 550 kg compared to 455 kg. That’s a difference of about 95 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
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Frequently compared as well

Mercedes B Class
Mercedes GLA
VS
The Mercedes B‑Class and Mercedes GLA target buyers who want Mercedes practicality with premium touches, but they take different paths: the B‑Class is a spacious, hatchback-style people carrier while the GLA is a compact crossover with a higher ride height and sportier stance. This comparison looks …
Mercedes A Class
Mercedes B Class
VS
The Mercedes A‑Class is the sporty, tech‑savvy compact that thrills with sharp handling and a slick cockpit, while the Mercedes B‑Class trades a bit of attitude for towering practicality, roomier seats and a more useful boot. Choose the A‑Class if you want driving fun and style; pick the B‑Class if …
Mercedes B Class
Kia K4

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.

details
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18C0947_009
18C0953_005
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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

Kia K4

Kia K4 shakes up the compact-sedan crowd with concept-car looks, a smartly packaged cabin, and the kind of easygoing refinement that makes rush hour feel less like a chore. It blends value, tech, and a dash of attitude, serving up a smooth, confident drive that might have you taking the long way home just to show off those angles.

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Reviews Kia K4

4.4 (6 Reviews)
rate
Joz
20 May 2026, 08:04:45

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but with a sluggish gearbox and poor noise insulation.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Joz
20 May 2026, 08:04:45

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but with a sluggish gearbox and poor soundproofing.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Joz
20 May 2026, 08:04:44

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but with a sluggish gearbox and poor noise insulation.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Joz
20 May 2026, 08:04:44

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but with a sluggish gearbox and poor sound insulation.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Joz
20 May 2026, 08:04:44

A modern, ultra-easy-to-use car with a full set of systems and assistants that work as they should, but hampered by a sluggish gearbox and poor soundproofing.

Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money

Frequently compared as well

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BMW 2 Series Active Tourer
Mercedes B Class
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The BMW 2 Series Active Tourer and the Mercedes B‑Class are the two leading compact MPVs for buyers who need practical space without the bulk of an SUV. The 2 Series Active Tourer leans toward a driver-focused, sharper feel, while the B‑Class prioritizes passenger comfort, flexible packaging and a …
Kia Ceed
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Kia XCeed
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Audi Q2
Mercedes B Class
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In the competitive compact SUV market, the Audi Q2 stands out with its bold design and sporty handling, appealing to those seeking a dynamic driving experience. In contrast, the Mercedes B-Klasse emphasizes practicality and comfort, offering a spacious interior and advanced technology features that …
Ford Focus
Kia K4
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Ford Focus and Kia K4 go head-to-head: compare performance, space, features and price in one quick overview to see which model suits your daily driving, budget and lifestyle better. A clear, side-by-side look helps you make the smarter choice. || Unsure whether the Ford Focus or the Kia K4 is the …
Audi Q3
Mercedes B Class
VS
In the competitive landscape of compact luxury vehicles, the Audi Q3 stands out with its dynamic design and sporty performance, appealing to drivers seeking a spirited driving experience. On the other hand, the Mercedes B-Klasse offers a more practical approach, prioritizing spacious interiors and …
Mercedes B Class
Mercedes CLA Coupe
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Mercedes B Class and Mercedes CLA Coupe go head-to-head: compare performance, space, features and price in one quick overview to see which model suits your daily driving, budget and lifestyle better. A clear, side-by-side look helps you make the smarter choice. || Unsure whether the Mercedes B …
Mercedes B Class
Kia K4

Costs and Consumption
Price
33,100 - 52,500 £
Price
24,800 - 34,200 £
Consumption L/100km
5.1 - 6.9 L/100km
Consumption L/100km
5.8 - 7.1 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
133 - 156 g/km
co2
132 - 161 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
MPV
Body Type
Hatchback, Estate
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,405 - 1,565 kg
Curb weight
1,415 - 1,540 kg
Trunk capacity
445 - 455 L
Trunk capacity
328 - 604 L
Length
-
Length
-
Width
1,796 mm
Width
1,850 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
515 - 550 kg
Payload
435 - 455 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel
Engine Type
Petrol, Petrol MHEV
Transmission
Automatic
Transmission
Manuel, Automatic
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Front-Wheel Drive
Power HP
116 - 238 HP
Power HP
115 - 180 HP
Acceleration 0-100km/h
6.5 - 10 s
Acceleration 0-100km/h
8.4 - 12.3 s
Max Speed
-
Max Speed
-
Torque
200 - 400 Nm
Torque
200 - 265 Nm
Number of Cylinders
4
Number of Cylinders
3 - 4
Power kW
85 - 175 kW
Power kW
85 - 132 kW
Engine capacity
1,332 - 1,991 cm3
Engine capacity
998 - 1,598 cm3

General
Model Year
2025
Model Year
2,025 - 2,026
CO2 Efficiency Class
D, E, F
CO2 Efficiency Class
D, E, F
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.