Game math, without the guesswork.

Why this site exists

Most game calculators copy each other, and a lot of them are simply wrong — for example, almost every "Roblox tax calculator" claims Roblox takes a flat 30% and you keep 70%. That is only true for in-experience items. For avatar items sold on the Marketplace, Roblox's progressive revenue share means the creator's share depends on how the item is priced, and it is not the same number.

So every tool here does two things: it cites the official source for the formula, and it shows the scenario where that formula applies. If a number can change after a game update, the page says when it was last verified.

More tools are added as they pass the same bar. Nothing on this site requires an account, and nothing you type is uploaded anywhere — the math runs entirely in your browser.

How to use a calculator here

1. Pick the tool that matches your question, not the game you happen to be playing. A payout question and a conversion question look similar and are answered by two different pages, because the numbers behind them are not the same.
2. Choose the scenario before you trust the result. Where a game applies more than one rate, the calculator makes you pick one. That is deliberate: a single "average" rate would be wrong for almost everyone.
3. Read the Sources line at the bottom. It links to the documentation the figures came from and records the date they were checked. If a publisher has patched the game since that date, that line is how you know the page may be out of date.

Why one game can have several different "rates"

This trips up more people than any other part of game maths. A single platform often runs several payout structures at once, and which one applies depends on what was sold and where — not on who you are.

Roblox is the clearest example. Selling an in-experience item such as a game pass carries a flat 30% platform commission, so the creator keeps 70%. Selling an avatar item on the Marketplace works differently: the creator's share starts at 30% at the item's floor price and climbs as the price rises above it, reaching 70% only at six times the floor. Reselling a Limited splits the sale four ways instead. Three structures, one platform, and a calculator that assumes a single number will overstate or understate your payout depending on which one you actually used.

That is the reason this site asks you to choose a scenario instead of quietly picking one for you, and why each page lists the structures side by side.

What's here now, and what's coming

The site is deliberately small. Two Roblox calculators are live, each written against Roblox's own creator documentation and verified on the date shown on the page. More tools are in progress — game maths where the formula is fixed and can be checked against a primary source, rather than figures that change with every community update.

Tools that depend on fast-moving community value lists are not on the roadmap, because a number that is wrong next week is worse than no number at all.