If you mean Robux , the current estimate is about 1 Robux = ¥0.14 JPY based on a live converter result, so 100 Robux would be about ¥14 JPY. Roblox’s official help page also notes that pricing may show in USD by default if native currency pricing is not supported in your country.

Quick conversion

  • 10 Robux ≈ ¥1.43 JPY.
  • 100 Robux ≈ ¥14.34 JPY.
  • 1,000 Robux ≈ ¥143.4 JPY.

Important note

If you meant a specific Roblox game’s “yen” currency rather than Japanese yen, the amount depends on that game, and different games use different rates or earning systems.