Audi A3 vs Mercedes-Benz C-Class
A detailed look at how two of Australia's most popular cars compare on price, running costs, safety, and everyday livability.
Specifications and pricing correct at time of publishing. Prices are RRP before on-road costs unless stated otherwise. Always confirm with the manufacturer or dealer before purchasing.
Price Breakdown
The Audi A3 starts from $54,800 before on-road costs, while the Mercedes-Benz C-Class opens at $76,900. That makes the Audi A3 the more affordable entry point by $22,100.
Once you factor in stamp duty, registration, CTP insurance, and dealer delivery, expect to add roughly 8-12% on top of the RRP depending on your state. That puts estimated driveaway prices in the ballpark of $60,280 and $84,590 respectively.
Over 5 years, the running costs favour the Audi A3 by roughly $1,995 in fuel alone.
Safety Rundown
Both the Audi A3 and Mercedes-Benz C-Class hold a 5-star ANCAP safety rating. Adult occupant protection scored 89% for the Audi A3 and 91% for the Mercedes-Benz C-Class.
Where the two diverge is in active safety technology. The Audi A3 packs more ADAS features with 7 out of 10 key systems fitted, compared to 6 in the Mercedes-Benz C-Class.
Both include the essentials: autonomous emergency braking, lane keep assist, adaptive cruise control, a reversing camera. Airbag count is 6 in the Audi A3 and 9 in the Mercedes-Benz C-Class.
Feature Showdown
The Audi A3 features a 10.1-inch touchscreen, while the Mercedes-Benz C-Class gets a 11.9-inch display. Apple CarPlay and Android Auto are standard across both.
The Audi A3 stands out with Apple CarPlay, heated front seats and power tailgate that you will not find on the Mercedes-Benz C-Class. The Mercedes-Benz C-Class counters with wireless Apple CarPlay/Android Auto, head-up display, wireless charging and panoramic roof. Which feature set matters more depends on your daily routine and priorities.
Drivetrain
The Audi A3 uses a Petrol MHEV producing 110kW and 250Nm of torque, sent through a 7-speed s tronic to a FWD layout. It covers the 0-100km/h sprint in 8.1 seconds.
The Mercedes-Benz C-Class responds with a Petrol making 150kW and 300Nm, paired to a automatic driving the rear wheels. It gets to 100km/h in 7.8 seconds.
The Mercedes-Benz C-Class has the clear power advantage at 150kW vs 110kW. In the real-world sprint, the Mercedes-Benz C-Class is 0.3s quicker. For most buyers, the way each car feels day-to-day matters more than outright acceleration.
Space & Comfort
The Audi A3 measures 4,352mm long on a 2,635mm wheelbase, 399mm shorter than the Mercedes-Benz C-Class at 4,751mm (2,865mm wheelbase). The longer wheelbase on the Mercedes-Benz C-Class generally means more rear legroom.
Boot space is 325L in the Audi A3 and 455L in the Mercedes-Benz C-Class, giving the Mercedes-Benz C-Class a 130L advantage.
For towing, the Mercedes-Benz C-Class leads with a 1,800kg braked capacity vs 1,200kg. That 600kg difference matters if you regularly hitch up.
Turning Circle
Kerb-to-kerb diameter. Smaller turns easier in tight carparks and U-turns.
10.6m to 11.1m
Based on 10.6m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Based on 11.1m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Turning circle ratings
True Cost to Own
Based on 15,000km of annual driving, fuel costs roughly $1,511/year for the Audi A3 and $1,910/year for the Mercedes-Benz C-Class. That is a $399 annual difference in favour of the Audi A3.
Estimated annual total: $1,511 (Audi A3) vs $1,910 (Mercedes-Benz C-Class). The Audi A3 saves you roughly $399 per year in total ownership costs. Use our Fuel Cost Calculator to estimate based on your driving.
Warranty: 5 years / 999,999km (Audi A3) vs 5 years / 999,999km (Mercedes-Benz C-Class). Both match on warranty length.
Who Should Buy Which?
Buy the Audi A3 if: You want the lower entry price, want lower running costs, or prefer Audi's approach to design and ownership experience.
Buy the Mercedes-Benz C-Class if: You prioritise performance, need more boot space, need stronger towing, or prefer Mercedes-Benz's approach to design and ownership experience.
The Verdict
The Mercedes-Benz C-Class takes 4 of 6 key spec categories. The Audi A3 will save you roughly $399 a year in fuel. If boot space matters, the Mercedes-Benz C-Class has a clear edge. The best pick depends on what you value most. Explore the full specs for each model below.
Common questions
Which is cheapest, Audi A3 and Mercedes-Benz C-Class?
The Audi A3 is the cheapest at $54,800 before on-road costs. That undercuts the Mercedes-Benz C-Class by $22,100.
Which is the most fuel-efficient?
The Audi A3 uses the least fuel at 5.3L/100km on the combined cycle.
Which is safest?
They are evenly matched — Audi A3 and Mercedes-Benz C-Class all hold a 5-star ANCAP rating. Compare the active-safety features above to separate them.
Which has the most boot space?
The Mercedes-Benz C-Class has the largest boot at 455L.
Which can tow the most?
The Mercedes-Benz C-Class has the highest braked towing capacity at 1,800kg.
Which is the most powerful?
The Mercedes-Benz C-Class makes the most power at 150kW. The Mercedes-Benz C-Class is quickest to 100km/h in 7.8s.
Disclaimer: All information in this comparison was believed to be correct at the time of publishing (20 April 2026). Prices are manufacturer recommended retail prices (RRP) and may vary by state, dealer, and options. Driveaway costs include estimated on-road costs for Victoria. Fuel economy figures are WLTP/ADR combined cycle. Specifications can change without notice. Always verify with the manufacturer before making a purchase decision. CarSorted does not accept payment for recommendations.
Auto-generated from CarSorted's specification data · 20 April 2026
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