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(500 × 7 ÷ 10) = 350.
Working backwards? See 500 Robux with tax. To receive 500 you would list at 715.
Nearby amounts
Both directions, using the same rounding as Roblox.
| Amount | List at this, you get | To get this, list at |
|---|---|---|
| 250 | 175 | 358 |
| 375 | 262 | 536 |
| 450 | 315 | 643 |
| 500 | 350 | 715 |
| 550 | 385 | 786 |
| 625 | 437 | 893 |
| 750 | 525 | 1,072 |
| 1,000 | 700 | 1,429 |
Robux transfer version
As a Robux transfer (10 to 500 per transfer) the recipient gets 450 and the game gets 50. Roblox does not document rounding for odd amounts, so this rounds down.