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BMW iX3 vs BYD Sealion 7
Selected trim40Change trim395 mi · 82.6 kWh · £53,250
Selected trimComfortChange trim300 mi · 82.5 kWh · £44,990
At a glance
In this comparison, BMW iX3 leads on motorway range, charging speed and running costs, while the BYD Sealion 7 counters with the lowest price.
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 need the fastest charging of these options
- you want the lowest running costs - from just 2p per mile on off-peak electricity
- you need the best car for city driving and tight parking
How we reached the recommendation
Verdict
Our take
The BMW iX3 leads in the most categories, but each car here has its strengths.
Value
BMW
6.2
BYD
6
Too close to call
Motorway RangeBMW
BMW
7.8
BYD
3.1
Family
BMW
8
BYD
8
Too close to call
ChargingBMW
BMW
8.3
BYD
5.9
Cost Per MileBMW
BMW
6.4
BYD
0.8
City DrivingBMW
BMW
3.3
BYD
2.2
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 | BYD Sealion 7Comfort |
|---|---|---|
| Price | £53,250 | £44,990 (better) |
| Official range | 395 miles (better) | 300 miles |
| Boot space | 520 L | 520 L |
| 10-80% rapid charge | 21 min (better) | 24 min |
| 0-62 mph | 6 sec (better) | 6.7 sec |
Size Comparison
View:
Align by:
BMW iX3
BYD Sealion 7
Length
BMW iX34,782mm-48mm
BYD Sealion 74,830mm
Width
BMW iX31,895mm-30mm
BYD Sealion 71,925mm
Height
BMW iX31,635mm
BYD Sealion 71,620mm-15mm
Space, size & parking
Parking & manoeuvring
Compare exterior dimensions to assess how each car fits UK parking spaces.
| Measure | BMW iX340 | BYD Sealion 7Comfort |
|---|---|---|
| Length | 4,782 mm | 4,830 mm |
| Width (mirrors folded) | 1,895 mm (better) | 1,925 mm |
| Width with mirrors out | 2,093 mm (better) | 2,189 mm |
| Height | 1,635 mm | 1,620 mm |
| Turning circle | 12.1 m | 11.7 m (better) |
| Clearance in a standard bayA standard UK parking bay is 2,400 mm wide. | 505 mm spare (better) | 475 mm spare |
People & luggage
Compare seating, child-seat mounting points, boot space and towing capacity.
| Measure | BMW iX340 | BYD Sealion 7Comfort |
|---|---|---|
| Seats | Not available | 5 |
| Boot space (seats up) | 520 L | 520 L |
| Boot space (seats down) | 1750 L | 1789 L (better) |
| Frunk | 58 L | 58 L |
| Towing capacity (braked) | Not available | 750 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.
BYD Sealion 7
- One of 33 of 232 UK EVs in our catalogue with V2L (vehicle-to-load) support.
- At 4,830 mm, longer than 80% of SUVs we track.
Full specifications
| Specification |  BMW iX3 40 |  BYD Sealion 7 Comfort |
|---|---|---|
| Dimensions | ||
| Length | 4.78m | 4.83m+48mm |
| Width | 1.90m | 1.93m+30mm |
| Width (mirrors) | 2.09m | 2.19m+96mm |
| Height | 1.64m | 1.62m-15mm |
| Wheelbase | 2.90m | 2.93m+34mm |
| Ground Clearance | Not available | 157mm |
| Capacity | ||
| Boot (seats up) | 520L | 520L |
| Boot (seats down) | 1750L | 1789L (better) |
| Frunk | 58L | 58L |
| Seats | Not available | 5 |
| Practicality | ||
| Turning Circle | 12.1m | 11.7m (better) |
| Kerb Weight | 2,200kg (better) | 2,225kg |
| Towing Capacity | Not available | 750kg |
| Electric | ||
| Battery | 82.6kWh (better) | 82.5kWh |
| Range (WLTP) | 395 mi (better) | 300 mi |
| Max DC Charge | 300kW (better) | 150kW |
| Pricing | ||
| UK MSRP | £53,250 | £44,990 (better) |
| Details | ||
| Body Style | SUV | SUV |
| Available | 2026+ | 2025+ |
Range & charging
Range, charging & battery
Check official and estimated driving range alongside charging speeds, efficiency and battery technology.
| Measure | BMW iX340 | BYD Sealion 7Comfort |
|---|---|---|
| Official range (WLTP) | 395 miles (better) | 300 miles |
| Estimated motorway rangeEVcarsguide estimate at sustained motorway speed. | 293 miles (better) | 204 miles |
| 10-80% rapid charge time | 21 min (better) | 24 min |
| Max rapid charge rate | 300 kW (better) | 150 kW |
| Home AC charging | 11 kW | 11 kW |
| Energy consumption | 146 Wh/km (better) | 199 Wh/km |
| Usable battery capacity | 82.6 kWh (better) | 82.5 kWh |
| Battery chemistry | Not available | LFP |
| Battery architecture | 800V | Not available |
| Heat pump | Not available | Standard |
Driving & everyday use
Performance & drivetrain
Compare acceleration, power and drivetrain specifications for the selected trims.
| Measure | BMW iX340 | BYD Sealion 7Comfort |
|---|---|---|
| 0-62 mph | 6 sec (better) | 6.7 sec |
| Power | 235 kW (better) | 230 kW |
| Torque | 500 Nm (better) | 380 Nm |
| Drivetrain | RWD | RWD |
What the critics say
See how UK motoring publications rate each car in their road tests.
BMW iX3
40
BYD Sealion 7
Comfort
6.6/10
average across 6 reviews
- Parkers3.9/5
- Electrifying.com7/10
- Auto Express3.5/5
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 - BYD Sealion 7 Comfort
Tested 2025
Adult Occupant87%
Child Occupant93%
Vulnerable Road Users76%
Safety Assist79%
Full result on euroncap.com (opens in new tab)
Warranty
Check the published battery warranty cover for each selected trim.
| Measure | BMW iX340 | BYD Sealion 7Comfort |
|---|---|---|
| Battery warranty | Not available | 8 years |
| Battery warranty distance | Not available | 250,000 km |
Buying options
Get a quote
BMW iX3
Used on AutoTraderLease deals
BYD Sealion 7
Used on AutoTraderLease deals
Frequently asked questions
Is the BMW iX3 worth the extra £8,260 over the BYD Sealion 7?
The BMW iX3 costs £8,260 more than the BYD Sealion 7. For that premium it adds 94 miles more WLTP range, 150 kW faster peak rapid charging and lower energy use, 146 versus 199 Wh/km. On EVcarsguide's combined category scores, the BMW iX3 comes out ahead overall.
Which is cheaper to own over 5 years, the BMW iX3 or the BYD Sealion 7?
The BYD Sealion 7 is £8,260 cheaper to buy. The BMW iX3 is cheaper to charge, roughly £160 a year versus £216 for the BYD Sealion 7, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the BYD Sealion 7 comes out roughly £7,980 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 BYD Sealion 7 like on a long motorway trip?
EVcarsguide estimates a real-world motorway range of about 293 miles for the BMW iX3 and 204 miles for the BYD Sealion 7 - both below their WLTP figures, because sustained high speed is the hardest case for an EV. The BMW iX3 goes roughly 89 miles further between charging stops. Both rapid-charge to 80% in a similar time, around 21-24 minutes.
Which is easier to park and drive in town, the BMW iX3 or the BYD Sealion 7?
The BMW iX3 is the easier car for tight UK car parks: it is 30 mm narrower than the BYD Sealion 7. In a standard 2,400 mm bay that leaves about 505 mm of total clearance for the BMW iX3 and about 475 mm of total clearance for the BYD Sealion 7. The BYD Sealion 7 also turns in a 0.4 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 BYD Sealion 7 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 BYD Sealion 7 rank among the best electric SUVsWhere the BMW iX3 and BYD Sealion 7 rank among long-range EVsWhere the BMW iX3 and BYD Sealion 7 rank among the best motorway EVsWhere the BMW iX3 and BYD Sealion 7 rank among the best city EVsWhere the BMW iX3 and BYD Sealion 7 rank among the cheapest EVs to runWhere the BMW iX3 and BYD Sealion 7 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 .