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Kia K4 vs Mercedes B Class comparison

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

Kia K4 vs Mercedes B Class: Key differences

Kia K4

4.4 (6 Reviews)
rate
  • markedly cheaper
  • markedly more trunk space
details

Mercedes B Class

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

K4

Costs and Efficiency:

When it comes to price and running costs, the biggest differences usually appear. This is often where you see which car fits your budget better in the long run.

Kia K4 is markedly 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.

B Class

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

Space and Everyday Use:

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

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 somewhat 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 is far ahead overall 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

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
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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 …
Kia K4
Mercedes B Class

Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

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

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_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

Frequently compared as well

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Peugeot 308 SW 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 Peugeot 308 SW or the Kia K4 …
BMW X1
Mercedes B Class
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In the competitive landscape of premium compact crossovers, the BMW X1 and Mercedes B-Klasse stand out with their distinct offerings. The BMW X1 impresses with its sporty dynamics and robust engine options, making it a delight for those who crave a spirited driving experience. Meanwhile, the …
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 …
Kia K4
Mercedes B Class

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

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

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

General
Model Year
2,025 - 2,026
Model Year
2025
CO2 Efficiency Class
D, E, F
CO2 Efficiency Class
D, E, F
Brand
Kia
Brand
Mercedes-Benz
Is the Kia K4 offered with different drivetrains?

The Kia K4 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.