GamerCalc is an independent, fan-made set of tools for Roblox limited trading, built and run by Dimitris, a software developer. It launched in August 2026 out of a simple frustration: deciding whether a trade is fair requires juggling several numbers — community value, RAP, demand, trend, the projected flag — and most players juggle exactly one of them.
What the site does
The core of the site is the trade calculator: build both sides of an offer from the live catalogue of Roblox limiteds and get a verdict that weighs all of those signals at once, with the weighting model fully disclosed on the methodology page. Around it sit a live value list, per-item value pages, a Robux currency converter, an XP time predictor, and a set of hand-written trading guides.
Where the numbers come from
None of the trading figures on this site are invented here. Item values, RAP, demand and trend ratings come from the public Rolimons item API, refreshed hourly. Price and volume history comes from Roblox's own economy API. The only thing GamerCalc adds on top is the openly documented weighting model that turns those inputs into a verdict — and where an item has thin data, the pages say so rather than papering over it.
What the site is not
- Not affiliated with Roblox Corporation or with Rolimons. This is a third-party fan project.
- Not financial advice. Values are community estimates about virtual items; they move, and no tool here guarantees an outcome.
- Not a marketplace. GamerCalc never handles items, accounts or payments — it is read-only analysis. Anyone claiming to trade or act on GamerCalc's behalf is not us.
Supporting the site
GamerCalc is free and supported by advertising. Because much of the Roblox audience is young, ads are served non-personalised and the analytics configuration has advertising signals disabled — the details are in the privacy policy.
Corrections, questions or takedown requests: see the contact page. If a number on this site looks wrong, it probably reflects the upstream source — but tell us anyway, because “probably” is not a standard we want to hide behind.