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Kia Stonic vs Mercedes B Class comparison

Compare performance (115 HP vs 238 HP), boot space and price (20,400 £ vs 33,100 £ ) at a glance. Find out which car is the better choice for you – Kia Stonic or Mercedes B Class?

Kia Stonic vs Mercedes B Class: Key differences

Kia Stonic

4.6 (2 Reviews)
rate
  • significantly cheaper
  • slightly lighter
details

Mercedes B Class

4.9 (5 Reviews)
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  • considerably more power
  • very slightly more efficient
  • substantially quicker 0–100 km/h
  • visibly 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

Stonic

Costs and Efficiency:

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

Kia Stonic is significantly cheaper – starting at 20,400 £ , while the Mercedes B Class costs 33,100 £ . That’s a price difference of around 12,738 £.

Fuel consumption also shows a difference: the Mercedes B Class uses 5.1 L/100km and is very slightly more efficient than the Kia Stonic with 5.6 L/100km. The difference is about 0.5 L/100km.

B Class

Engine and Performance:

Power, torque and acceleration say a lot about how a car feels on the road. This is where you see which model delivers more driving dynamics.

When it comes to engine power, the Mercedes B Class offers considerably more power – delivering 238 HP compared to 115 HP. That’s roughly 123 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes B Class is substantially quicker – completing the sprint in 6.5 s, while the Kia Stonic takes 10.7 s. That’s about 4.2 s quicker.

There’s also a difference in torque: the Mercedes B Class delivers clearly more torque with 400 Nm compared to 200 Nm. That’s about 200 Nm more.

Stonic

Space and Everyday Use:

Beyond pure performance, interior space and usability matter most in daily life. This is where you see which car is more practical and versatile.

Both vehicles offer seating for 5 people.

In terms of curb weight, Kia Stonic is slightly lighter – 1,205 kg compared to 1,405 kg. The difference is around 200 kg.

Looking at boot space, the Mercedes B Class offers visibly more boot space – 455 L compared to 352 L. That’s a difference of about 103 L.

When it comes to payload, the Mercedes B Class carries slightly more – 550 kg compared to 445 kg. That’s a difference of about 105 kg.

Who wins the race in the data check?

The Mercedes B Class is clearly superior 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
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Frequently compared as well

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Kia Stonic
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Kia Stonic

The Kia Stonic is a compact crossover that pairs nimble city manners with a surprisingly spacious and comfortable cabin. It’s a practical, well-equipped choice for buyers who value sensible features, approachable styling and easy everyday usability.

details
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Kia_Stonic_MY22_16
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Kia_Stonic_MJ22_05

Reviews Kia Stonic

4.6 (2 Reviews)
rate
Jan
18 Mar 2026, 07:19:10

Very good car, uses little fuel, nothing's gone wrong in 4 years, no breakdowns.

How do you mainly use this car? (optional): Commuter (short/medium distance)
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Ennio
4 Feb 2026, 13:19:36

I'm very satisfied — I have a Stonic Black Edition hybrid, and I haven't had any problems after two years.

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

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
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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Kia Stonic
Mercedes B Class

Costs and Consumption
Price
20,400 - 26,800 £
Price
33,100 - 52,500 £
Consumption L/100km
5.6 - 5.7 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
126 - 128 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
1,205 - 1,270 kg
Curb weight
1,405 - 1,565 kg
Trunk capacity
352 L
Trunk capacity
445 - 455 L
Length
-
Length
-
Width
1,760 mm
Width
1,796 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
440 - 445 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
100 - 115 HP
Power HP
116 - 238 HP
Acceleration 0-100km/h
10.7 - 12.1 s
Acceleration 0-100km/h
6.5 - 10 s
Max Speed
-
Max Speed
-
Torque
172 - 200 Nm
Torque
200 - 400 Nm
Number of Cylinders
3
Number of Cylinders
4
Power kW
74 - 85 kW
Power kW
85 - 175 kW
Engine capacity
998 cm3
Engine capacity
1,332 - 1,991 cm3

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

The Kia Stonic 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.