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(200 × 7 ÷ 10) = 140.
Working backwards? See 200 Robux with tax. To receive 200 you would list at 286.
Nearby amounts
Both directions, using the same rounding as Roblox.
| Amount | List at this, you get | To get this, list at |
|---|---|---|
| 100 | 70 | 143 |
| 150 | 105 | 215 |
| 180 | 126 | 258 |
| 200 | 140 | 286 |
| 220 | 154 | 315 |
| 250 | 175 | 358 |
| 300 | 210 | 429 |
| 400 | 280 | 572 |
Robux transfer version
As a Robux transfer (10 to 500 per transfer) the recipient gets 180 and the game gets 20. Roblox does not document rounding for odd amounts, so this rounds down.