The BMW 640i has 31 cu ft of cargo space. In practice that is 5 checked suitcases, or 15 carry-ons, or about 24 supermarket bags. A folded pushchair fits. Against 24 cars with a similar-sized cabin it sits above the average of 27.7 cu ft.
What actually fits in a 640i
Cubic feet are an abstraction — 31 cu ft means nothing until you load it. Here is the same number in things people actually load, 5 checked cases or 15 carry-ons for the BMW 640i, with a packing allowance — a boot is not a cube, and corners go to waste.
| What you are loading | How many fit | Each item |
|---|---|---|
| Checked suitcases | 5 | 27 × 21 × 14″ — 4.6 cu ft |
| Carry-on cases | 15 | 22 × 14 × 9″ — 1.6 cu ft |
| Supermarket bags | 24 | about 1 cu ft each |
| Golf bags | 4 | full set, about 5 cu ft |
| Folded pushchair | Fits | about 6 cu ft |
Counts assume 80% usable volume: luggage does not tessellate, and a wheel arch eats the rest.
Cabin or boot — where the space went
Every car is a fixed envelope, and designers decide how to split it between people and things — the BMW 640i gives 22.5% of its 138 cu ft to luggage. The share below is the honest way to compare an estate with a coupé of the same footprint, and among 24 cars with a cabin within eight cubic feet of the BMW 640i the boot averages 27.7 cu ft.
| Space | Volume | Share of total |
|---|---|---|
| Passenger cabin | 107 cu ft | |
| Cargo area | 31 cu ft | |
| Total interior | 138 cu ft |
A typical split for a family car: room for people first, luggage second.
Against cars with a similar cabin
Compared with 24 models whose passenger space is within eight cubic feet — a fairer group than marketing classes, which put an estate and a coupé in the same bracket.
| Measure | This car | Similar cars | Difference |
|---|---|---|---|
| Cargo volume | 31 cu ft | 27.7 cu ft | +3.3 cu ft |
| In checked suitcases | 5 | 4 | +1 |
Cars with the same room
Closest matches by load volume with the seats folded — useful when the boot is the deciding factor and the badge is not. The BMW 640i sits at 31 cu ft, so these are the cars that carry the same load.
| Car | Load volume | vs BMW 640i | Checked suitcases | Measured |
|---|---|---|---|---|
| Subaru Forester | +3 cu ft | 5 | 2017 | |
| Hyundai Ioniq | -4 cu ft | 4 | 2022 | |
| Hyundai Santa Fe Sport | +4 cu ft | 6 | 2013 | |
| BMW X1 | -4 cu ft | 4 | 2022 | |
| BMW 328i | -6 cu ft | 4 | 2016 | |
| BMW 335i | -6 cu ft | 4 | 2016 |
Boot space is one number. Buying is a longer list.
- Check a VIN for recalls, complaints and its exact build
- Exact value for that car, adjusted for its mileage
- The original window sticker and factory options
- Full research report as a PDF you can hand to a mechanic
- No ads, on every page
- No ads, no tracking — and much more
How we count
Cargo and passenger volumes come from EPA interior-volume records — the same figures manufacturers file for the window sticker, measured to a standard method rather than claimed in a brochure.
The luggage counts are ours — 5 checked cases for the BMW 640i come out of its 31 cu ft. We assume 80% usable volume, because a boot is not a cube: wheel arches, a sloping tailgate and the shape of the cases themselves waste the rest, which is why the BMW 640i counts as 24.8 cu ft of usable space rather than 31. Suitcase sizes are the airline standards — 22 × 14 × 9″ for carry-on, 27 × 21 × 14″ for checked, so the BMW 640i takes 15 of the small ones. Numbers are deliberately conservative; if we say four cases fit, four cases fit.
Frequently asked questions
How much cargo space does the BMW 640i have?
31 cu ft behind the rear seats, plus 107 cu ft of passenger cabin.
How many suitcases fit in a 640i?
About 5 checked cases (27 × 21 × 14″) or 15 carry-ons, allowing for the fact that a boot is not a perfect cube.
Will a pushchair fit in a 640i?
Yes — a folded pushchair takes roughly 6 cu ft and this car has 31, so it fits with room for shopping.
Is that a lot for this size of car?
Compared with 24 cars of a similar cabin size, it is above the average of 27.7 cu ft.
Mark ForCar as a preferred source and our data shows up first in your Google results. One click, no account.