3400 Robux is about A$64.63 using a current estimate of A$0.019008 per Robux. That comes from the rate shown in the source, which says 1,000 Robux is about A$19.01 AUD.

Quick math

  • 1 Robux ≈\approx ≈ A$0.019008
  • 3400 Robux ≈\approx ≈ A$64.626
  • Rounded: A$64.63

Note

Robux pricing can vary a bit depending on whether you’re using store purchase prices, DevEx-style estimates, or third-party calculators, so the exact amount may differ slightly.

Extra context

A separate source gives a different estimate of about A$0.018625 per Robux, which would put 3400 Robux at about A$63.33. So a practical answer is that 3400 Robux is roughly A$63–A$65.

TL;DR: 3400 Robux is around A$64.63 , with small variation depending on the rate used.