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Audi Q4 e-tron (2021-2023) vs Mercedes-Benz GLB
Selected trim35 e-tron · 2021-23Change trim221 mi · 55 kWh · £40,750
Selected trim250+ Electric380 mi · 85 kWh · £46,100
At a glance
In this comparison, Audi Q4 e-tron leads on running costs and city driving, while the Mercedes-Benz GLB leads on value for money, motorway range and family practicality.
Which should you choose?
Choose the Audi Q4 e-tron (2021-2023) if...
- you want the lowest running costs - from just 2.1p per mile on off-peak electricity
- you drive in the city - it's compact with an excellent turning circle
Choose the Mercedes-Benz GLB if...
- you want the most for your money - best overall spec per pound
- you do long motorway journeys - it has the best estimated real-world range at speed
- you need the most family-friendly option with good safety and space
- you need the fastest charging of these options
How we reached the recommendation
Verdict
Our take
The Mercedes-Benz GLB leads in the most categories, but each car here has its strengths.
ValueMercedes-Benz
Audi
5.1
Mercedes-Benz
7
Motorway RangeMercedes-Benz
Audi
3.7
Mercedes-Benz
6.3
FamilyMercedes-Benz
Audi
7.7
Mercedes-Benz
8.7
ChargingMercedes-Benz
Audi
2
Mercedes-Benz
9.1
Cost Per MileAudi
Audi
4.8
Mercedes-Benz
3.5
City DrivingAudi
Audi
6
Mercedes-Benz
4
What each car does better
See the specification differences behind the verdict, with supporting figures for each advantage.
Mercedes-Benz GLB
250+ Electric
- 159 miles more WLTP range
- 220 kW faster rapid charging
- 75 kW more power
- 1.6s quicker 0-62 mph
- 2 more seats
Key specifications
Compare the key specifications for your selected trims.
| Measure | Audi Q4 e-tron35 e-tron | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| Price | £40,750 (better) | £46,100 |
| Official range | 221 miles | 380 miles (better) |
| Boot space | 520 L | 540 L (better) |
| 10-80% rapid charge | Not available | 20 min |
| 0-62 mph | 9 sec | 7.4 sec (better) |
Size Comparison
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Audi Q4 e-tron
Mercedes-Benz GLB
Length
Audi Q4 e-tron4,588mm-144mm
Mercedes-Benz GLB4,732mm
Width
Audi Q4 e-tron1,865mm
Mercedes-Benz GLB1,861mm-4mm
Height
Audi Q4 e-tron1,632mm-55mm
Mercedes-Benz GLB1,687mm
Space, size & parking
Parking & manoeuvring
Compare exterior dimensions to assess how each car fits UK parking spaces.
| Measure | Audi Q4 e-tron35 e-tron | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| Length | 4,588 mm | 4,732 mm |
| Width (mirrors folded) | 1,865 mm | 1,861 mm (better) |
| Width with mirrors out | 2,108 mm | 2,029 mm (better) |
| Height | 1,632 mm | 1,687 mm |
| Turning circle | 10.2 m (better) | 11.2 m |
| Clearance in a standard bayA standard UK parking bay is 2,400 mm wide. | 535 mm spare | 539 mm spare (better) |
People & luggage
Compare seating, child-seat mounting points, boot space and towing capacity.
| Measure | Audi Q4 e-tron35 e-tron | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| Seats | 5 | 7 (better) |
| Boot space (seats up) | 520 L | 540 L (better) |
| Boot space (seats down) | 1490 L | Not available |
| Frunk | Not available | 127 L |
| Towing capacity (braked) | Not available | 1,500 kg |
How each stacks up
Percentile ranks against UK EVs of the same body style.
Audi Q4 e-tron
Not enough peers to make confident percentile claims.
Mercedes-Benz GLB
- A 127 L frunk, one of 4 of 233 UK EVs in our catalogue with a front boot of 127 L or more.
- 380 mile WLTP range, longer than 90% of SUVs we track.
- Peak DC charging of 320 kW, faster than 90% of SUVs in our catalogue.
Full specifications
| Specification |  Audi Q4 e-tron 35 e-tron |  Mercedes-Benz GLB 250+ Electric |
|---|---|---|
| Dimensions | ||
| Length | 4.59m | 4.73m+144mm |
| Width | 1.86m | 1.86m-4mm |
| Width (mirrors) | 2.11m | 2.03m-79mm |
| Height | 1.63m | 1.69m+55mm |
| Wheelbase | 2.76m | 2.89m+124mm |
| Capacity | ||
| Boot (seats up) | 520L | 540L (better) |
| Boot (seats down) | 1490L | Not available |
| Frunk | Not available | 127L |
| Seats | 5 | 7 (better) |
| Practicality | ||
| Turning Circle | 10.2m (better) | 11.2m |
| Kerb Weight | Not available | 2,270kg |
| Towing Capacity | Not available | 1,500kg |
| Electric | ||
| Battery | 55kWh | 85kWh (better) |
| Range (WLTP) | 221 mi | 380 mi (better) |
| Max DC Charge | 100kW | 320kW (better) |
| Pricing | ||
| UK MSRP | £40,750 (better) | £46,100 |
| Details | ||
| Body Style | SUV | SUV |
| Available | 2021–2023 | 2026+ |
Range & charging
Range, charging & battery
Check official and estimated driving range alongside charging speeds, efficiency and battery technology.
| Measure | Audi Q4 e-tron35 e-tron | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| Official range (WLTP) | 221 miles | 380 miles (better) |
| Estimated motorway rangeEVcarsguide estimate at sustained motorway speed. | 184 miles | 268 miles (better) |
| 10-80% rapid charge time | Not available | 20 min |
| Max rapid charge rate | 100 kW | 320 kW (better) |
| Home AC charging | 7.2 kW | 22 kW (better) |
| Energy consumption | Not available | 164 Wh/km |
| Usable battery capacity | 52 kWh | 85 kWh (better) |
| Battery chemistry | NMC | NMC |
| Battery architecture | 400V | 800V (better) |
Driving & everyday use
Performance & drivetrain
Compare acceleration, power and drivetrain specifications for the selected trims.
| Measure | Audi Q4 e-tron35 e-tron | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| 0-62 mph | 9 sec | 7.4 sec (better) |
| Power | 125 kW | 200 kW (better) |
| Torque | Not available | 335 Nm |
| Drivetrain | RWD | RWD |
What the critics say
See how UK motoring publications rate each car in their road tests. One car has more review coverage than the other - we show that rather than guessing.
Audi Q4 e-tron
35 e-tron
No critic reviews gathered yet for this car.
Mercedes-Benz GLB
250+ Electric
Watch the reviews
Watch selected video reviews here, or visit each model page for the full collection.
Reviews and videos discuss each model overall; the specifications above apply to your selected trims.
Prices & deals
Calculate your real costs
For a useful running-cost comparison, factor in your mileage, charging access and current petrol or diesel car alongside the EV estimate.
Compare with petrol or diesel
Compare purchase price, energy, road tax and maintenance with a petrol or diesel alternative.
Calculate company-car tax
Work out monthly Benefit-in-Kind using current and future HMRC rates.
Cost per mile
Compare EV charging costs per mile with petrol and diesel using your charging options.
Check a lease quote
Assess the effective monthly cost alongside the list price and expected depreciation.
Safety & ownership confidence
Euro NCAP - Audi Q4 e-tron 35 e-tron
Tested 2021
Adult Occupant93%
Child Occupant89%
Vulnerable Road Users66%
Safety Assist80%
Full result on euroncap.com (opens in new tab)
Euro NCAP - Mercedes-Benz GLB 250+ Electric
Tested 2025
Adult Occupant92%
Child Occupant88%
Vulnerable Road Users78%
Safety Assist74%
Full result on euroncap.com (opens in new tab)
Warranty
Check the published battery warranty cover for each selected trim.
| Measure | Audi Q4 e-tron35 e-tron | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| Battery warranty | 8 years | Not available |
| Battery warranty distance | 160,934 km | Not available |
Buying options
Get a quote
Audi Q4 e-tron
Used on AutoTraderLease deals
Mercedes-Benz GLB
Used on AutoTraderLease deals
Live used listings
Active inventory from independent UK dealers.
Audi Q4 e-tron
- £19,0412023Car360View
- £18,3932023Car360View
Mercedes-Benz GLB
No active listings.
Frequently asked questions
Is the Mercedes-Benz GLB worth the extra £5,350 over the Audi Q4 e-tron?
The Mercedes-Benz GLB costs £5,350 more than the Audi Q4 e-tron. For that premium it adds 159 miles more WLTP range, 220 kW faster peak rapid charging and 75 kW more power. On EVcarsguide's combined category scores, the Mercedes-Benz GLB comes out ahead overall.
Which is cheaper to own over 5 years, the Audi Q4 e-tron or the Mercedes-Benz GLB?
The Audi Q4 e-tron is £5,350 cheaper to buy. Running costs are almost identical - about £168 a year either way, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the Audi Q4 e-tron comes out roughly £5,390 cheaper overall. These figures cover list price and home charging only - insurance, servicing, tyres and depreciation will move the real total.
What are the Audi Q4 e-tron and Mercedes-Benz GLB like on a long motorway trip?
EVcarsguide estimates a real-world motorway range of about 184 miles for the Audi Q4 e-tron and 268 miles for the Mercedes-Benz GLB - both below their WLTP figures, because sustained high speed is the hardest case for an EV. The Mercedes-Benz GLB goes roughly 85 miles further between charging stops.
Which is easier to park and drive in town, the Audi Q4 e-tron or the Mercedes-Benz GLB?
The two are within 4 mm on width, so neither is meaningfully easier to thread into a tight space. In a standard 2,400 mm bay that leaves about 539 mm of total clearance for the Mercedes-Benz GLB and about 535 mm of total clearance for the Audi Q4 e-tron. The Audi Q4 e-tron also turns in a 1.0 m tighter circle, which helps with U-turns and multi-storey ramps.
Which battery will hold up better as a used buy, the Audi Q4 e-tron or the Mercedes-Benz GLB?
Over a 8-year ownership window EVcarsguide's degradation model projects roughly 84% battery health for the Audi Q4 e-tron and 84% for the Mercedes-Benz GLB. That is close enough that capacity loss should not decide between them. Both use NMC-type cells, so for daily use keep the charge limit near 80% to slow degradation.
Go deeper on each car
Visit the full model pages for owner feedback, expert reviews, used prices and battery-health information.
Compare against other rivals
Compare similarly sized and priced electric cars before finalising your shortlist.
More Audi Q4 e-tron comparisons
More Mercedes-Benz GLB comparisons
See both cars in our rankings
EVcarsguide scores every verified EV on price, range, family use and running costs. Here is where this pair appears.
Where the Audi Q4 e-tron and Mercedes-Benz GLB rank among the best family EVsWhere the Audi Q4 e-tron and Mercedes-Benz GLB rank among the best electric SUVsWhere the Audi Q4 e-tron and Mercedes-Benz GLB rank among the best motorway EVsWhere the Audi Q4 e-tron and Mercedes-Benz GLB rank among the best city EVsWhere the Audi Q4 e-tron and Mercedes-Benz GLB rank among the cheapest EVs to runWhere the Audi Q4 e-tron and Mercedes-Benz GLB rank among EVs with the biggest boots
If neither is quite right
Explore other verified electric cars that may better suit the priorities this pair does not meet.
Further reading
Explore buying and ownership guides to help you choose between these electric cars.
Data accuracy
Specs are sourced from manufacturer websites and manually reviewed. These figures were last verified .