Online casino calculators · free, no sign-up

Granny’s abacus

Understand any bonus at a glance, plan sessions that fit your budget and check the maths of every table game.

01 Casino Wagering Calculator Free casino wagering calculator: enter your deposit, match %, wagering and game RTP to see the total playthrough and the average cost of clearing a bonus. Open the calculator → 02 Slot Budget Calculator Free slot budget calculator: enter your stake, spins and RTP to see the total staked, average cost per session and per hour, and the most you could lose. Open the calculator → 03 Roulette Odds Calculator Free roulette odds calculator for European, French and American wheels: see the payout, win chance, house edge and average loss per spin for every bet. Open the calculator → 04 Blackjack Strategy Chart & Hand Checker Free interactive blackjack strategy chart: pick your hand and the dealer's up-card to see the right move, with full charts and the soft-17 rule changes. Open the calculator → 05 Free Spins Calculator Free spins calculator: enter the number of spins, spin value, RTP, wagering on winnings and max-win cap to estimate what any free spins offer is really worth. Open the calculator → 06 Martingale Simulator: Does the Roulette System Work? Free roulette system simulator: test the Martingale, Fibonacci and D'Alembert with your bankroll and table limit, and see how often each one wins or busts. Open the calculator → 07 Poker Pot Odds and Equity Calculator Free poker pot odds calculator: enter the pot, the bet and your outs to see the equity you need, your exact chance of hitting and whether calling is profitable. Open the calculator → 08 Casino Bonus Comparison Calculator Free casino bonus comparison calculator: compare two welcome offers by bonus cash, wagering and average value after the house edge to see which is worth more. Open the calculator → 09 Craps Odds Calculator Free craps odds calculator: pick any craps bet to see its house edge, the average cost of each bet and of an hour at the table, from pass line to any seven. Open the calculator → 10 Casino Winnings Tax Calculator Free casino winnings tax calculator: estimate federal and state tax on slot jackpots, table games and poker, with W-2G thresholds and the 2026 loss cap. Open the calculator →