BYD vs Tesla Boot Space: Every Model Compared for Families

On paper Tesla appears to have far bigger boots, but the numbers are not measured the same way. Tesla quotes volume up to the roof, while BYD quotes it to the window line, so the headline litres are not directly comparable. Measured fairly, the gap narrows sharply. For families, the Tesla Model Y offers the most usable total space, the BYD Sealion 7 is close behind, and the Model 3 beats the BYD Seal on outright luggage room. Frunks favour Tesla across the board.

Boot Space at a Glance

Measurement	Boot (seats up)	Frunk
BYD Atto 3	500 L	58 L
BYD Seal	400 L	53 L
BYD Sealion 7	520 L	58 L
Tesla Model 3	594 L	88 L
Tesla Model Y	854 L (to roof)	117 L

Why Boot Space Matters for EV Buyers

For families, boot space is often the deciding practical factor, more than range or performance. Prams, weekly shops, and holiday luggage all need somewhere to go.

EVs have a twist: many offer a frunk, a front storage area where the engine would be. This is ideal for keeping charging cables separate from your main load.

The catch is that manufacturers measure boots differently, which makes comparing headline figures misleading. Reading the numbers correctly is half the battle.

BYD Atto 3 Boot Space

The Atto 3 offers a practical 500 litres with the seats up, with an adjustable floor that can be set to two heights for a flat load surface.

• Boot: 500 litres, seats up
• Frunk: 58 litres, enough for cables and small items
• Handy touch: A powered tailgate accessible from the key fob

For a compact SUV, that is a genuinely usable boot that suits most family duties. How it compares directly to Tesla's family SUV is covered in our comparison of the Atto 3 against the Model Y.

Tesla Model Y Boot Space

The Model Y is the cargo champion here, but its headline number needs context. Tesla quotes 854 litres, measured up to the roof rather than the window line.

• Boot: 854 litres quoted, to the roof
• Frunk: A large 117 litres
• Seats folded: Over 2,100 litres in two-seat configuration

Even accounting for the generous measurement, the Model Y is genuinely spacious, with a deep well under the boot floor and the biggest frunk in this group.

BYD Seal vs Tesla Model 3 Boot

Among the sedans, Tesla has the clearer advantage.

• Tesla Model 3: 594 litres of boot plus an 88-litre frunk
• BYD Seal: 400 litres of boot plus a 53-litre frunk
• Total usable: Roughly 682 litres for the Model 3 against about 453 for the Seal

The Model 3's bigger boot and deeper frunk give it a real practicality edge. The Seal's figures are verified in our full guide to the Seal's dimensions and boot space. The Seal counters with more rear legroom, though its bench is less comfortable on long trips.

BYD Sealion 7 Boot and Frunk

The Sealion 7 is BYD's answer to the Model Y, and it is competitive.

• Boot: 520 litres, seats up
• Frunk: 58 litres
• Seats folded: Up to 1,789 litres

Measured to the same window-line standard, the Sealion 7's 520 litres is much closer to the Model Y than the raw 854-litre figure suggests. Its smaller frunk is the main practical shortfall. Our head-to-head on the Sealion 7 against the Model Y digs into the full comparison.

Rear Seats Folded: Flat Load Floor Check

With the seats down, maximum capacity matters, but so does whether the floor is flat.

• Tesla Model Y: The most space and a near-flat floor, ideal for bulky loads
• BYD Sealion 7: Up to 1,789 litres, with a largely flat floor
• BYD Atto 3: Its adjustable floor helps create a level surface, a genuine advantage
• Sedans: Both the Seal and Model 3 use a 60/40 split but are limited by the saloon boot opening

For flat-pack furniture or bikes, the SUVs are far more useful than the sedans, and the Model Y leads.

Pushchair and Luggage Fit Test

In practical terms, what actually fits?

• Prams: All five swallow a standard pushchair with the seats up, with room to spare in the SUVs
• Suitcases: The Model 3 holds around seven cases below the parcel shelf, more than the Seal
• Airport run: The Model Y and Sealion 7 handle a family's holiday luggage easily
• Frunk use: Tesla's larger frunks each swallow a carry-on case, where BYD's suit cables and bags

For a growing family doing regular big shops and trips, the two SUVs are the sensible choices, with the sedans better suited to smaller households.

Frunk Comparison: Size and Usability

Frunks are where Tesla consistently pulls ahead.

• Tesla Model Y: 117 litres, the largest here
• Tesla Model 3: 88 litres, big enough for a carry-on
• BYD Atto 3 and Sealion 7: 58 litres each
• BYD Seal: 53 litres

Tesla's frunks are deep, usable wells. BYD's are smaller and best thought of as dedicated cable storage rather than extra luggage space.

Full Boot Space Comparison

Bringing it together, the honest ranking for total usable everyday space is: the Tesla Model Y leads, the BYD Sealion 7 follows closely once measurement is standardised, and among sedans the Model 3 clearly beats the Seal.

The key is to compare like with like. Tesla's to-the-roof figures inflate the apparent gap, but even corrected, Tesla holds a real frunk advantage and the Model Y remains the most practical family hauler here.

Common Mistakes

• Comparing headline litres directly: Tesla measures to the roof, BYD to the window line
• Ignoring the frunk: Add it in for a fair total, and it favours Tesla
• Assuming a low sedan is cramped: The Seal's flat floor adds usable volume
• Forgetting seat-fold practicality: A flat floor matters as much as the litre figure
• Overlooking the Atto 3's adjustable floor: It creates a level load surface many rivals lack
• Buying a sedan for bulky loads: The SUVs are far more accommodating with seats down