About The Low Lay
A calculator site for the arithmetic behind sweepstakes coin packages and wagering requirements. Nothing more, and deliberately so.
Sweepstakes promotions are described in a vocabulary — playthrough multipliers, RTP, contribution percentages — that sounds precise and is rarely explained. The numbers are not hard. What makes them confusing is that they interact, and that the interaction is usually left out.
A 10x requirement means nothing on its own. At 96% RTP and full contribution it costs about 40% of a balance; at 20% contribution the same requirement is expected to consume the balance entirely. Neither figure is available from the promotion’s headline, and both are a few lines of arithmetic away.
This site does that arithmetic and shows its working.
The standard
- Every formula is published. Not summarised — written out, with each variable named and its unit stated.
- Every assumption is listed next to the result that depends on it, not buried in a methodology page nobody reads.
- Every limitation is stated in the same breath as the figure. Where a calculation cannot answer a question, it says so rather than producing a number that looks like an answer.
- No figure is invented. An RTP appears only when it can be read from a primary document or derived from the stated rules of the game.
- Nothing predicts an outcome. Expected values are averages over enormous numbers of repetitions. Simulations describe a model. Neither describes you.
What this site is not
It does not review casinos, rank operators, score them, or recommend where to play. It does not track free rewards, promotional histories or cashout experiences. It does not cover which jurisdictions permit what. Those are all real subjects, and none of them is this one.
It also does not claim first-hand testing. Nothing here is based on anyone playing at an operator and reporting back, and where a claim would require that, it is not made.
How it is built
The calculators run entirely in your browser. Nothing you type is transmitted, logged or stored, there is no account, and the pages are readable without JavaScript — every formula, worked example and limitation is in the HTML the server sends, not assembled later inside a widget.
Money and coin values use exact decimal arithmetic rather than binary floating point. Deterministic calculators compute at 28 decimal places of working precision and round for display. The variance simulation uses ordinary floating-point arithmetic. Input that is ambiguous is rejected with an explanation rather than guessed at. The models are tested against an independent re-derivation and against hand-worked examples pinned to a version. The methodology page covers all of it.
There are no third-party requests on any page: no webfonts, no trackers, no embedded scripts. Production is delivered through Cloudflare, which may inject a same-origin /cdn-cgi/ script when it thinks a page contains an email address.