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BYD ATTO 3 vs Smart #3
Selected trimEVO Design RWDChange trim317 mi · 74.8 kWh · £38,990
Selected trimProChange trim202 mi · 66 kWh · £33,960
At a glance
In this comparison, BYD ATTO 3 leads on motorway range, charging speed and running costs, while the Smart #3 leads on family practicality.
Which should you choose?
Choose the BYD ATTO 3 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 drive in the city - it's compact with an excellent turning circle
Choose the Smart #3 if...
- you need the most family-friendly option with good safety and space
How we reached the recommendation
Verdict
Our take
The BYD ATTO 3 leads in the most categories, but each car here has its strengths.
Value
BYD
5.9
Smart
6.1
Too close to call
Motorway RangeBYD
BYD
5.1
Smart
2.8
FamilySmart
BYD
5
Smart
5.7
ChargingBYD
BYD
5.1
Smart
1.7
Cost Per MileBYD
BYD
6.2
Smart
2.7
City DrivingBYD
BYD
6.5
Smart
6
What each car does better
See the specification differences behind the verdict, with supporting figures for each advantage.
BYD ATTO 3
EVO Design RWD
- 115 miles more WLTP range
- 70 litres more boot space
- 70 kW faster rapid charging
- 30 kW more power
- 25 Wh/km more efficient
- 750 kg more towing capacity
Key specifications
Compare the key specifications for your selected trims.
| Measure | BYD ATTO 3EVO Design RWD | Smart #3Pro |
|---|---|---|
| Price | £38,990 | £33,960 (better) |
| Official range | 317 miles (better) | 202 miles |
| Boot space | 440 L (better) | 370 L |
| 10-80% rapid charge | 35 min | 30 min (better) |
| 0-62 mph | 5.5 sec (better) | 5.8 sec |
Size Comparison
View:
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BYD ATTO 3
Smart #3
Length
BYD ATTO 34,455mm
Smart #34,400mm-55mm
Width
BYD ATTO 31,875mm
Smart #31,844mm-31mm
Height
BYD ATTO 31,615mm
Smart #31,556mm-59mm
Space, size & parking
Parking & manoeuvring
Compare exterior dimensions to assess how each car fits UK parking spaces.
| Measure | BYD ATTO 3EVO Design RWD | Smart #3Pro |
|---|---|---|
| Length | 4,455 mm | 4,400 mm |
| Width (mirrors folded) | 1,875 mm | 1,844 mm (better) |
| Width with mirrors out | 2,075 mm | Not available |
| Height | 1,615 mm | 1,556 mm |
| Turning circle | 10.4 m | Not available |
| Clearance in a standard bayA standard UK parking bay is 2,400 mm wide. | 525 mm spare | 556 mm spare (better) |
People & luggage
Compare seating, child-seat mounting points, boot space and towing capacity.
| Measure | BYD ATTO 3EVO Design RWD | Smart #3Pro |
|---|---|---|
| Seats | 5 | 5 |
| ISOFIX child-seat points | 3 | Not available |
| Boot space (seats up) | 440 L (better) | 370 L |
| Boot space (seats down) | 1338 L (better) | 1160 L |
| Frunk | Not available | 15 L |
| Towing capacity (braked) | 750 kg (better) | 0 kg |
How each stacks up
Percentile ranks against UK EVs of the same body style.
BYD ATTO 3
- Uses 147 Wh/km on the WLTP cycle, more efficient than 95% of SUVs we track.
- One of 33 of 232 UK EVs in our catalogue with V2L (vehicle-to-load) support.
- 10.4 m turning circle, tighter than 85% of SUVs in our database.
Smart #3
Not enough peers to make confident percentile claims.
Full specifications
| Specification |  BYD ATTO 3 EVO Design RWD |  Smart #3 Pro |
|---|---|---|
| Dimensions | ||
| Length | 4.46m | 4.40m-55mm |
| Width | 1.88m | 1.84m-31mm |
| Width (mirrors) | 2.08m | Not available |
| Height | 1.61m | 1.56m-59mm |
| Wheelbase | 2.72m | 2.79m+65mm |
| Ground Clearance | 180mm | Not available |
| Capacity | ||
| Boot (seats up) | 440L (better) | 370L |
| Boot (seats down) | 1338L (better) | 1160L |
| Frunk | Not available | 15L |
| Seats | 5 | 5 |
| Practicality | ||
| Turning Circle | 10.4m | Not available |
| Kerb Weight | 1,750kg | Not available |
| Towing Capacity | 750kg (better) | Not available |
| Electric | ||
| Battery | 74.8kWh (better) | 66kWh |
| Range (WLTP) | 317 mi (better) | 202 mi |
| Max DC Charge | 220kW (better) | 150kW |
| Pricing | ||
| UK MSRP | £38,990 | £33,960 (better) |
| Details | ||
| Body Style | SUV | Coupe |
| Available | 2026+ | 2024+ |
Range & charging
Range, charging & battery
Check official and estimated driving range alongside charging speeds, efficiency and battery technology.
| Measure | BYD ATTO 3EVO Design RWD | Smart #3Pro |
|---|---|---|
| Official range (WLTP) | 317 miles (better) | 202 miles |
| Estimated motorway rangeEVcarsguide estimate at sustained motorway speed. | 263 miles (better) | 189 miles |
| 10-80% rapid charge time | 35 min | 30 min (better) |
| Max rapid charge rate | 220 kW (better) | 150 kW |
| Home AC charging | 11 kW (better) | 7.4 kW |
| Energy consumption | 147 Wh/km (better) | 172 Wh/km |
| Usable battery capacity | 74.8 kWh (better) | 66 kWh |
| Battery chemistry | LFP | NMC |
| Battery architecture | 400V | Not available |
| Heat pump | Standard | Not available |
Driving & everyday use
Performance & drivetrain
Compare acceleration, power and drivetrain specifications for the selected trims.
| Measure | BYD ATTO 3EVO Design RWD | Smart #3Pro |
|---|---|---|
| 0-62 mph | 5.5 sec (better) | 5.8 sec |
| Power | 230 kW (better) | 200 kW |
| Torque | 310 Nm | Not available |
| Drivetrain | RWD | RWD |
What the critics say
See how UK motoring publications rate each car in their road tests.
BYD ATTO 3
EVO Design RWD
Smart #3
Pro
Watch the reviews
Watch selected video reviews here, or visit each model page for the full collection.
BYD ATTO 3
All 3 videos
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 - Smart #3 Pro
Full result on euroncap.com (opens in new tab)
Warranty
Check the published battery warranty cover for each selected trim.
| Measure | BYD ATTO 3EVO Design RWD | Smart #3Pro |
|---|---|---|
| Battery warranty | 8 years | 8 years |
| Battery warranty distance | 250,000 km | Not available |
Buying options
Get a quote
BYD ATTO 3
Used on AutoTraderLease deals
Smart #3
Used on AutoTraderLease deals
Live used listings
Active inventory from independent UK dealers.
BYD ATTO 3
No active listings.
Smart #3
- £27,3002025EV ExpertsView
Frequently asked questions
Is the BYD ATTO 3 worth the extra £5,030 over the Smart #3?
The BYD ATTO 3 costs £5,030 more than the Smart #3. For that premium it adds 115 miles more WLTP range, 70 kW faster peak rapid charging and 70 litres more boot space. On EVcarsguide's combined category scores, the BYD ATTO 3 comes out ahead overall.
Which is cheaper to own over 5 years, the BYD ATTO 3 or the Smart #3?
The Smart #3 is £5,030 cheaper to buy. The BYD ATTO 3 is cheaper to charge, roughly £160 a year versus £192 for the Smart #3, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the Smart #3 comes out roughly £4,870 cheaper overall. These figures cover list price and home charging only - insurance, servicing, tyres and depreciation will move the real total.
What are the BYD ATTO 3 and Smart #3 like on a long motorway trip?
EVcarsguide estimates a real-world motorway range of about 263 miles for the BYD ATTO 3 and 189 miles for the Smart #3 - both below their WLTP figures, because sustained high speed is the hardest case for an EV. The BYD ATTO 3 goes roughly 75 miles further between charging stops. Both rapid-charge to 80% in a similar time, around 30-35 minutes.
Which is easier to park and drive in town, the BYD ATTO 3 or the Smart #3?
The Smart #3 is the easier car for tight UK car parks: it is 31 mm narrower than the BYD ATTO 3. In a standard 2,400 mm bay that leaves about 556 mm of total clearance for the Smart #3 and about 525 mm of total clearance for the BYD ATTO 3.
Which battery will hold up better as a used buy, the BYD ATTO 3 or the Smart #3?
Over a 8-year ownership window EVcarsguide's degradation model projects roughly 90% battery health for the BYD ATTO 3 and 84% for the Smart #3. That gives the BYD ATTO 3 a modest edge in retained real-world range. The BYD ATTO 3's LFP-type pack tolerates daily 100% charging, while the Smart #3's NMC-type pack lasts longest kept to about 80% for everyday use. Both batteries carry a 8-year manufacturer warranty.
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 BYD ATTO 3 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 BYD ATTO 3 and Smart #3 rank among the best family EVsWhere the BYD ATTO 3 and Smart #3 rank among EVs under £40,000Where the BYD ATTO 3 and Smart #3 rank among the best motorway EVsWhere the BYD ATTO 3 and Smart #3 rank among the best city EVsWhere the BYD ATTO 3 and Smart #3 rank among the cheapest EVs to runWhere the BYD ATTO 3 and Smart #3 rank among EVs with the biggest boots
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 .