Four interactive calculators and a growing shelf of T&C deep dives, built so a bonus, a wager or an RTP figure never again has to be taken on faith. Everything runs in your browser. Nothing is stored. The maths is open to anyone who wants to check it.
Enter the bonus amount, wager multiplier, max bet and expected RTP. The calculator returns the real expected cash value of the offer in your currency.
Open calculator →Model how much real money has to run through the games to clear a wager. Game-weight sliders, max-bet caps and session-size inputs make the picture honest.
Open calculator →Translate between decimal, fractional, American and implied probability in one keystroke. Side-by-side payout table for a 10 unit stake.
Open converter →Search a growing database of slot RTPs across providers. Compare the version operators serve against the maximum RTP the studio ships, and spot the gap.
Open RTP table →Casino marketing is loud. Four hundred percent match, a hundred free spins, cash drops, VIP tiers, no deposit needed. Underneath the headline sits a wager multiplier, a bet cap, a game weighting, an expiry clock, a withdrawal cap and a maximum convert-to-cash figure. By the time all of that is applied, the real expected value in a player's pocket is usually a small fraction of the headline number, sometimes it is zero, occasionally it is negative.
The Lab does the arithmetic. It is a public workshop where every claim a casino makes about a bonus, a wager, a payout speed or a return-to-player percentage is pulled apart, modelled honestly, and shown as a number you can act on. If a two hundred euro bonus is actually worth seven euros of expected value once you fold the terms in, we want you to see that before you deposit, not after.
Every tool here runs client-side. There are no accounts, no cookies collecting what you type, no data sent back to us. Open the source if you want to check the maths. We rewrite these pages whenever the sector shifts, so if a regulator changes a cap, a studio releases a new RTP version, or an operator tightens a wager rule, the calculators and lookups catch up fast.
The second shelf in the Lab is a slow-growing library of long-form, plain-English decodes of the small print that sits inside casino offers. Not a glossary. Each decoded piece picks one real clause, from a real brand, and takes it apart, line by line, so the next time you see the same phrasing anywhere else, you can read it in five seconds.
Most bonus terms state a maximum bet while the wager is open. Breach it once, even by one cent on an autoplay round, and the whole balance is void. We walk through four real wordings, how operators actually enforce the rule, and what you can safely stake.
Reading time, 8 minutes · Updated 2026-10A slot usually contributes 100 percent to the wager. A table game, 10 percent. Live blackjack, often zero. We model the real wager a mixed session clears, and why mixing is often a trap, not a shortcut.
Reading time, 7 minutes · Updated 2026-10Bonus winnings almost always carry a maximum conversion cap. We take four real examples, show the exact cap in euros, and work out what the real ceiling means on a 20, 50 or 100 euro deposit.
Reading time, 9 minutes · Updated 2026-10No. The Lab is intentionally brand-free. The calculators work with any numbers you paste in, and the decoded articles name real brands only where the clause itself is quoted directly. Our market pages do the ranking work. The Lab does the maths.
They are accurate for the inputs you give them. A bonus value calculator is only as honest as the terms you feed into it, so always pull the figures straight from the operator's bonus T&Cs rather than from the marketing banner. Where a term is deliberately vague, our decoded articles call it out.
Three sources: the official PAR sheets or help pages that studios publish, the regulator-filed RTP information where it exists, and spot-checks our reviewers run on live games. Where an operator serves a lower-RTP version of a slot, we flag it in the lookup rather than averaging it out.
Nothing you type leaves your browser. The calculators are plain JavaScript running on this page. There is no login, no analytics on these specific inputs, and no stored history. Refresh the page and your numbers are gone.
Decoded articles get a refresh when the clause they analyse changes in the wild. The RTP lookup is updated monthly, or sooner if a studio ships a new build. The calculators themselves rarely need changes, since the underlying maths does not move.
Yes. Email the team through our Contact page. We prioritise tools that answer a question a real player types into search, not generic educational pieces that already live elsewhere.