Casino & Betting Calculators
Six free calculators that run entirely in your browser. Work out what a bonus is really worth, how much a free-spins offer pays on average, convert odds, price an accumulator and plan a session budget — all in euros.
Last updated: 14 September 2026
Every tool below uses standard formulas that bookmakers and casinos use internally. Change any field and the results update immediately. Defaults are pre-filled with Instasino’s 2026 terms so you can compare offers quickly.
Bonus Wagering Calculator
A casino bonus is only as good as its wagering requirement. Enter your deposit and the bonus terms (Instasino’s first welcome tier is 120% up to €750 at 40x the bonus) and the tool shows the total bets required, the number of spins at your average stake and — using the game RTP — the expected cost of clearing it. If the estimated value is positive, the bonus is worth taking.
Bonus Wagering Calculator
See exactly how much you need to bet before a casino bonus can be withdrawn, and what it is really worth.
Effective turnover = wagering ÷ game contribution. Expected cost = effective turnover × (100% − RTP). Results are estimates for information only and are not a guarantee of winnings. Always read the full bonus terms before you play. 18+.
Free Spins Value Calculator
Free spins have a face value (spins × bet per spin), but what you actually keep depends on the RTP of the game and the wagering on winnings. This calculator gives the expected winnings and the turnover you will need to complete before cashing out.
Free Spins Value Calculator
Find out what a free-spins offer is realistically worth and how much you must wager on the winnings.
Expected winnings = spins × spin value × RTP, capped by the maximum cashout if one applies. Results are estimates for information only and are not a guarantee of winnings. Always read the full bonus terms before you play. 18+.
Cashback Calculator
Thunder League members receive 5–15% weekly cashback as real cash. Enter your net loss to see the cashback, your effective loss and the wagering if a cashback ever comes with a requirement.
Cashback Calculator
Estimate your weekly cashback return on net losses and what it means for your real loss.
Cashback = net loss × rate, limited by the weekly cap. Thunder League members receive 5–15% weekly cashback depending on tier. Results are estimates for information only and are not a guarantee of winnings. Always read the full bonus terms before you play. 18+.
Bet Payout & Odds Converter
Dutch bookmakers show decimal odds by default, but you will meet fractional odds on UK racing and American odds on US sports. Type in any format and get the payout, profit and implied probability plus the same odds in the other two formats.
Bet Payout & Odds Converter
Convert decimal, fractional and American odds and see your payout, profit and implied probability instantly.
Implied probability = 1 ÷ decimal odds. Bookmaker margin means the probabilities of all outcomes add up to more than 100%. Results are estimates for information only and are not a guarantee of winnings. Always read the full bonus terms before you play. 18+.
Accumulator (Parlay) Calculator
Accumulators multiply the odds of every leg. Enter up to eight decimal legs and your stake; add Instasino’s acca boost (+5% for three legs up to +30% for eight or more) to see the boosted payout.
Accumulator (Parlay) Calculator
Multiply the odds of up to eight legs, add an acca boost and see the total payout of your accumulator.
Combined odds are the product of all decimal legs. One losing leg loses the whole accumulator. Results are estimates for information only and are not a guarantee of winnings. Always read the full bonus terms before you play. 18+.
Session Budget Calculator
The most useful calculator on this page for staying in control. Enter your session budget, bet size and pace to see the expected loss over a session and how long a budget lasts on average. Use it to set a deposit limit that matches how you actually play.
Session Budget Calculator
Plan a gaming session: see how much you are likely to wager and lose at a given bet size, pace and RTP.
Expected loss = total wagered × (100% − RTP). Real sessions swing far above and below this average. Results are estimates for information only and are not a guarantee of winnings. Always read the full bonus terms before you play. 18+.
Frequently Asked Questions
How accurate are the results?
The formulas are exact; the uncertainty is in the inputs. RTP is a long-run average, so a single session can end far above or below the expected value. Treat results as a planning guide, not a prediction.
Where do I find a game’s RTP?
Open the game info (the “i” icon) in the Instasino lobby. Most slots list RTP between 94% and 97%; blackjack with basic strategy is about 99.5%.
Do the calculators store my data?
No. Everything is computed in your browser with JavaScript and nothing is transmitted to Instasino or any third party.
Calculators are provided for information only. They do not guarantee any outcome. Gambling involves risk — only bet what you can afford to lose and use the responsible gaming tools available on Instasino. 18+ | Speel Bewust.
Put the numbers to work
Now that you know what the bonus is worth, claim it at Instasino with your first deposit.