Prof. Boston's Tools
Every tool here is a lecture made interactive. The goal is to teach the reasoning, not just output a number. The casino has always known these numbers. Now you will too.
Input your bankroll and risk tolerance. Returns optimal bet sizing, expected session length, and rational exit points.
Use calculator →20 slots ranked by the number that actually matters — return to player percentage. Filtered by volatility, provider, and expected value.
Browse slots →Input a wagering requirement, RTP, and bonus amount. The calculator shows the expected cost of clearing the bonus — what you're actually paying for the casino's money.
Calculate EV →Four questions about your bankroll, session goals, and risk tolerance. Returns a volatility profile recommendation matched to your actual situation.
Take the quiz →Interactive Tool
Every casino bonus has a hidden cost: the wagering requirement. This calculator applies a straightforward formula — EV = Bonus - (Bonus x Wagering x House Edge) — to show you the expected value before you accept any offer.
Prof. Boston says
"A casino bonus is not free money. It is a loan with a repayment schedule disguised as a gift. The wagering requirement is the interest rate. This calculator shows you the true cost — the expected value after you've met the playthrough. Most bonuses are negative EV. Some are not. The maths tells you which."
Bonus vs. Expected Cost
* Based on the formula: EV = Bonus - (Total Wager x House Edge). Assumes optimal game selection and no bust-out variance. Real outcomes will vary around this expected value.
Apply the Maths
Wagering Requirements Decoded — the full mathematical breakdown Casino Bonuses Explained — the bonus analysis series Expected Value in Casino Gambling — the number that determines everything Behavioral Economics of Casino Design — how your decisions are engineered Best Slots for Real Money — ranked by RTP, not commission