The math
Roblox keeps a 30% Marketplace Fee on game passes and developer products and you receive 70%, rounded down to a whole Robux: floor(800 × 7 ÷ 10) = 560.
Nearby amounts
Both directions, using the same rounding as Roblox.
| Amount | List at this, you get | To get this, list at |
|---|---|---|
| 400 | 280 | 572 |
| 600 | 420 | 858 |
| 720 | 504 | 1,029 |
| 800 | 560 | 1,143 |
| 880 | 616 | 1,258 |
| 1,000 | 700 | 1,429 |
| 1,200 | 840 | 1,715 |
| 1,600 | 1,120 | 2,286 |
Robux transfer version
800 Robux is more than the 500 Robux limit for one transfer, so it takes 2 transfers. Sent in the largest chunks possible, the recipient gets 720 in total (90%). Transferred Robux are not eligible for DevEx.