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Kia Niro vs Mercedes S-Class comparison

Compare performance (138 HP vs 635 HP), boot space and price (29,100 £ vs 104,000 £ ) at a glance. Find out which car is the better choice for you – Kia Niro or Mercedes S-Class?

Kia Niro vs Mercedes S-Class: Key differences

Kia Niro

4.5 (3 Reviews)
rate
  • considerably cheaper
  • clearly lighter
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Mercedes S-Class

  • considerably more power
  • substantially more efficient
  • clearly quicker 0–100 km/h
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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:

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 Niro is considerably cheaper – starting at 29,100 £ , while the Mercedes S-Class costs 104,000 £ . That’s a price difference of around 74,885 £.

Fuel consumption also shows a difference: the Mercedes S-Class uses 2.2 L/100km and is substantially more efficient than the Kia Niro with 4.5 L/100km. The difference is about 2.3 L/100km.

S-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 S-Class offers considerably more power – delivering 635 HP compared to 138 HP. That’s roughly 497 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes S-Class is clearly quicker – completing the sprint in 4 s, while the Kia Niro takes 11.1 s. That’s about 7.1 s quicker.

There’s also a difference in torque: the Mercedes S-Class delivers considerably more torque with 850 Nm compared to 265 Nm. That’s about 585 Nm more.

Niro

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 Niro is clearly lighter – 1,474 kg compared to 2,165 kg. The difference is around 691 kg.

When it comes to payload, the Mercedes S-Class carries clearly more – 660 kg compared to 466 kg. That’s a difference of about 194 kg.

Who wins the race in the data check?

The Mercedes S-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 £104,000
S-Class

Mercedes S-Class

  • Engine Type : Petrol MHEV, Plugin Hybrid, Diesel MHEV
  • Transmission : Automatic
  • Drive Type : All-Wheel Drive, Rear-Wheel Drive
  • Power HP : 336 - 635 HP
  • Consumption L/100km : 2.2 - 11 L/100km
  • Electric Range : 98 - 118 km
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Frequently compared as well

Kia Niro
Kia XCeed
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It's the compact-crossover face-off that asks whether you crave wallet-friendly efficiency or a bit more personality: the Kia Niro goes toe-to-toe with the Kia XCeed. One is all about hybrid thrift and everyday practicality; the other flirts with sharper styling and a livelier drive — both sensible …
Hyundai Kona
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Mercedes S-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.

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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 S-Class

The Mercedes S-Class wraps peerless comfort, whisper-quiet luxury and subtle tech wizardry into a chauffeur-ready package that still knows how to engage the driver. It’s the car for buyers who want to arrive relaxed, be taken seriously and occasionally enjoy a grin when the road reminds them this limousine can dance.

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Reviews Mercedes S-Class

No reviews yet. Share your experience and help others decide.

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Mercedes S-Class

Costs and Consumption
Price
29,100 - 33,800 £
Price
104,000 - 201,400 £
Consumption L/100km
4.5 - 4.9 L/100km
Consumption L/100km
2.2 - 11 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
98 - 118 km
Battery Capacity
-
Battery Capacity
-
co2
102 - 111 g/km
co2
50 - 252 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
SUV
Body Type
Sedan
Seats
5
Seats
5
Doors
-
Doors
-
Curb weight
1,474 kg
Curb weight
2,165 - 2,650 kg
Trunk capacity
-
Trunk capacity
-
Length
-
Length
-
Width
1,825 mm
Width
1,921 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
466 kg
Payload
420 - 660 kg

Engine and Performance
Engine Type
Full Hybrid
Engine Type
Petrol MHEV, Plugin Hybrid, Diesel MHEV
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Automatic Gearbox
Drive Type
Front-Wheel Drive
Drive Type
All-Wheel Drive, Rear-Wheel Drive
Power HP
138 HP
Power HP
336 - 635 HP
Acceleration 0-100km/h
11.1 - 11.4 s
Acceleration 0-100km/h
4 - 5.7 s
Max Speed
-
Max Speed
-
Torque
265 Nm
Torque
560 - 850 Nm
Number of Cylinders
4
Number of Cylinders
6 - 8
Power kW
102 kW
Power kW
247 - 467 kW
Engine capacity
1,580 cm3
Engine capacity
2,989 - 3,982 cm3

General
Model Year
2025
Model Year
2026
CO2 Efficiency Class
C
CO2 Efficiency Class
G, B, 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.