6500 Robux is roughly worth about 31–33 USD at the standard player purchase rate, and that converts to around 9,000–10,000 LKR depending on the day’s exchange rate. The estimate is based on a current Robux-to-USD rate of about $12.50 per 1,000 Robux and a live LKR conversion source showing roughly 0.01984 LKR per 1 RBX.

Quick breakdown

  • 1,000 Robux ≈ $12.50.
  • 6,500 Robux ≈ $81.25.
  • Using the live LKR rate shown in the source, that comes out to about LKR 10,050.

Note

Robux value can vary depending on whether you mean:

  • What players pay to buy Robux , or
  • What developers receive through DevEx.

The player purchase rate is usually the more relevant one for “how much is it worth” in everyday use.

TL;DR: 6500 Robux is about LKR 10,000 in Sri Lanka, give or take a bit based on exchange rate changes.