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BMW iX3 vs Mercedes-Benz GLB
Selected trim40Change trim395 mi · 82.6 kWh · £53,250
Selected trim250+ Electric380 mi · 85 kWh · £46,100
At a glance
In this comparison, BMW iX3 leads on motorway range and running costs, while the Mercedes-Benz GLB leads on value for money, family practicality and charging speed.
Which should you choose?
Choose the BMW iX3 if...
- you do long motorway journeys - it has the best estimated real-world range at speed
- you want the lowest running costs - from just 2p per mile on off-peak electricity
Choose the Mercedes-Benz GLB if...
- you want the most for your money - best overall spec per pound
- you need the most family-friendly option with good safety and space
- you need the fastest charging of these options
- you need the best car for city driving and tight parking
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
BMW
6.2
Mercedes-Benz
7
Motorway RangeBMW
BMW
7.8
Mercedes-Benz
6.3
FamilyMercedes-Benz
BMW
8
Mercedes-Benz
8.7
ChargingMercedes-Benz
BMW
8.3
Mercedes-Benz
9.1
Cost Per MileBMW
BMW
6.4
Mercedes-Benz
3.5
City DrivingMercedes-Benz
BMW
3.3
Mercedes-Benz
4
What each car does better
See the specification differences behind the verdict, with supporting figures for each advantage.
Key specifications
Compare the key specifications for your selected trims.
| Measure | BMW iX340 | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| Price | £53,250 | £46,100 (better) |
| Official range | 395 miles (better) | 380 miles |
| Boot space | 520 L | 540 L (better) |
| 10-80% rapid charge | 21 min | 20 min (better) |
| 0-62 mph | 6 sec (better) | 7.4 sec |
Size Comparison
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BMW iX3
Mercedes-Benz GLB
Length
BMW iX34,782mm
Mercedes-Benz GLB4,732mm-50mm
Width
BMW iX31,895mm
Mercedes-Benz GLB1,861mm-34mm
Height
BMW iX31,635mm-52mm
Mercedes-Benz GLB1,687mm
Space, size & parking
Parking & manoeuvring
Compare exterior dimensions to assess how each car fits UK parking spaces.
| Measure | BMW iX340 | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| Length | 4,782 mm | 4,732 mm |
| Width (mirrors folded) | 1,895 mm | 1,861 mm (better) |
| Width with mirrors out | 2,093 mm | 2,029 mm (better) |
| Height | 1,635 mm | 1,687 mm |
| Turning circle | 12.1 m | 11.2 m (better) |
| Clearance in a standard bayA standard UK parking bay is 2,400 mm wide. | 505 mm spare | 539 mm spare (better) |
People & luggage
Compare seating, child-seat mounting points, boot space and towing capacity.
| Measure | BMW iX340 | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| Seats | Not available | 7 |
| Boot space (seats up) | 520 L | 540 L (better) |
| Boot space (seats down) | 1750 L | Not available |
| Frunk | 58 L | 127 L (better) |
| Towing capacity (braked) | Not available | 1,500 kg |
How each stacks up
Percentile ranks against UK EVs of the same body style.
BMW iX3
- 395 mile WLTP range, longer than 95% of SUVs we track.
- Peak DC charging of 300 kW, faster than 90% of SUVs in our catalogue.
- Uses 146 Wh/km on the WLTP cycle, more efficient than 95% of SUVs we track.
Mercedes-Benz GLB
- A 127 L frunk, one of 4 of 232 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 |  BMW iX3 40 |  Mercedes-Benz GLB 250+ Electric |
|---|---|---|
| Dimensions | ||
| Length | 4.78m | 4.73m-50mm |
| Width | 1.90m | 1.86m-34mm |
| Width (mirrors) | 2.09m | 2.03m-64mm |
| Height | 1.64m | 1.69m+52mm |
| Wheelbase | 2.90m | 2.89m-8mm |
| Capacity | ||
| Boot (seats up) | 520L | 540L (better) |
| Boot (seats down) | 1750L | Not available |
| Frunk | 58L | 127L (better) |
| Seats | Not available | 7 |
| Practicality | ||
| Turning Circle | 12.1m | 11.2m (better) |
| Kerb Weight | 2,200kg (better) | 2,270kg |
| Towing Capacity | Not available | 1,500kg |
| Electric | ||
| Battery | 82.6kWh | 85kWh (better) |
| Range (WLTP) | 395 mi (better) | 380 mi |
| Max DC Charge | 300kW | 320kW (better) |
| Pricing | ||
| UK MSRP | £53,250 | £46,100 (better) |
| Details | ||
| Body Style | SUV | SUV |
| Available | 2026+ | 2026+ |
Range & charging
Range, charging & battery
Check official and estimated driving range alongside charging speeds, efficiency and battery technology.
| Measure | BMW iX340 | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| Official range (WLTP) | 395 miles (better) | 380 miles |
| Estimated motorway rangeEVcarsguide estimate at sustained motorway speed. | 293 miles (better) | 268 miles |
| 10-80% rapid charge time | 21 min | 20 min (better) |
| Max rapid charge rate | 300 kW | 320 kW (better) |
| Home AC charging | 11 kW | 22 kW (better) |
| Energy consumption | 146 Wh/km (better) | 164 Wh/km |
| Usable battery capacity | 82.6 kWh | 85 kWh (better) |
| Battery chemistry | Not available | NMC |
| Battery architecture | 800V | 800V |
Driving & everyday use
Performance & drivetrain
Compare acceleration, power and drivetrain specifications for the selected trims.
| Measure | BMW iX340 | Mercedes-Benz GLB250+ Electric |
|---|---|---|
| 0-62 mph | 6 sec (better) | 7.4 sec |
| Power | 235 kW (better) | 200 kW |
| Torque | 500 Nm (better) | 335 Nm |
| Drivetrain | RWD | RWD |
What the critics say
See how UK motoring publications rate each car in their road tests.
BMW iX3
40
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 - BMW iX3 40
Tested 2026
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)
Buying options
Get a quote
BMW iX3
Used on AutoTraderLease deals
Mercedes-Benz GLB
Used on AutoTraderLease deals
Frequently asked questions
Is the BMW iX3 worth the extra £7,150 over the Mercedes-Benz GLB?
The BMW iX3 costs £7,150 more than the Mercedes-Benz GLB. For that premium it adds 35 kW more power, a 1.4s quicker 0-62mph time and lower energy use, 146 versus 164 Wh/km. On EVcarsguide's combined category scores, the Mercedes-Benz GLB comes out ahead overall.
Which is cheaper to own over 5 years, the BMW iX3 or the Mercedes-Benz GLB?
The Mercedes-Benz GLB is £7,150 cheaper to buy. Running costs are almost identical - about £160 a year either way, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the Mercedes-Benz GLB comes out roughly £7,070 cheaper overall. These figures cover list price and home charging only - insurance, servicing, tyres and depreciation will move the real total.
What are the BMW iX3 and Mercedes-Benz GLB like on a long motorway trip?
EVcarsguide estimates a real-world motorway range of about 293 miles for the BMW iX3 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 BMW iX3 goes roughly 24 miles further between charging stops. Both rapid-charge to 80% in a similar time, around 20-21 minutes.
Which is easier to park and drive in town, the BMW iX3 or the Mercedes-Benz GLB?
The Mercedes-Benz GLB is the easier car for tight UK car parks: it is 34 mm narrower than the BMW iX3. In a standard 2,400 mm bay that leaves about 539 mm of total clearance for the Mercedes-Benz GLB and about 505 mm of total clearance for the BMW iX3. The Mercedes-Benz GLB also turns in a 0.9 m tighter circle, which helps with U-turns and multi-storey ramps.
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 BMW iX3 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 BMW iX3 and Mercedes-Benz GLB rank among the best electric SUVsWhere the BMW iX3 and Mercedes-Benz GLB rank among long-range EVsWhere the BMW iX3 and Mercedes-Benz GLB rank among the best motorway EVsWhere the BMW iX3 and Mercedes-Benz GLB rank among the best city EVsWhere the BMW iX3 and Mercedes-Benz GLB rank among the cheapest EVs to runWhere the BMW iX3 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.
Data accuracy
Specs are sourced from manufacturer websites and manually reviewed. These figures were last verified .