Jay Calder
Editor, WagerCodes
Jay maintains WagerCodes, which publishes free calculators and reference material for working out what gambling offers are actually worth. The tools here are built to be checked rather than trusted — every formula used is shown on the page that uses it.
How the tools here are built
Every calculator on this site shows the formula it uses on the same page that uses it. That is deliberate: a number you cannot check is worth about as much as a number you were told. The working rules:
- The formula is published next to the tool. If you disagree with the model, you can see exactly where you disagree.
- Worked examples are computed, not asserted. The figures in the prose come from the same arithmetic the calculator runs, so the two cannot drift apart.
- Nothing you enter is transmitted. The calculators run entirely in your browser. No seed, deposit figure, or drop table leaves your device.
- The limits are stated. Each tool says what it does not account for — risk of ruin, cashout caps, withdrawal spreads — because those are usually where the real cost sits.
What I don't claim
- I am not a financial adviser, and nothing here is financial advice.
- I have not audited any operator's finances, licensing, or solvency. These tools evaluate offers and odds, not companies.
- Expected value is a long-run average. It describes a distribution, not your session, and most people lose.
- Some pages link to sites that pay a commission. Where that applies it is disclosed on the page.
Corrections
If a formula here is wrong, a worked example does not add up, or a tool returns something it should not, that is a bug and it should be fixed. See the editorial policy for how corrections are handled.