Free EV Calculators for 150 AP Slot Machines (MHB + Persistent State)
April 1st, 2026 at 9:32:22 PM
permalink
Hi everyone,
Long-time reader of the Wizard's work — his math articles are what got me interested in the quantitative side of slots in the first place.
I've been working on a project that I think this community might find useful (or at least interesting to critique — I know you folks don't pull punches on bad math, which is exactly why I'm posting here).
I built a set of free EV calculators for 150 advantage play slot machines. The idea is simple: you walk up to a machine, enter the current meter value or state, and the calculator tells you the expected value of playing.
How the calculators work:
For must-hit-by progressives, the calculator uses the midpoint method on the remaining range, factors in base game RTP and bet size, and gives you an EV per spin estimate.
For persistent state machines (counters, collectors, etc.), the calculator estimates remaining cost to trigger based on where the counter/meter currently sits relative to the known trigger point.
There are 4 calculator templates:
1. MHB Calculator — for must-hit-by progressives
2. Counter Calculator — for persistent state counters (balls, orbs, collections)
3. Bet Multiplier Calculator — for games where bet sizing affects EV
4. Info Only — for machines where AP viability is marginal or data is insufficient
All 150 calculators are free, no signup required: https://slotstrat.com/calculators
I also wrote up guides for each machine covering what to look for, when to play, and when to walk. Those are at https://slotstrat.com/machines
What I'd love feedback on:
- Are my EV formulas reasonable? I've tried to be conservative but I know this crowd has deeper math chops than I do
- Are there machines I'm missing that should be included?
- Any errors in my trigger point data?
I'm not selling anything here — the calculators and guides are all free to use without an account. I built this because I wanted a better tool than doing napkin math on my phone at the casino, and figured other people might too.
Happy to share the methodology in more detail if anyone wants to dig into the numbers.
Long-time reader of the Wizard's work — his math articles are what got me interested in the quantitative side of slots in the first place.
I've been working on a project that I think this community might find useful (or at least interesting to critique — I know you folks don't pull punches on bad math, which is exactly why I'm posting here).
I built a set of free EV calculators for 150 advantage play slot machines. The idea is simple: you walk up to a machine, enter the current meter value or state, and the calculator tells you the expected value of playing.
How the calculators work:
For must-hit-by progressives, the calculator uses the midpoint method on the remaining range, factors in base game RTP and bet size, and gives you an EV per spin estimate.
For persistent state machines (counters, collectors, etc.), the calculator estimates remaining cost to trigger based on where the counter/meter currently sits relative to the known trigger point.
There are 4 calculator templates:
1. MHB Calculator — for must-hit-by progressives
2. Counter Calculator — for persistent state counters (balls, orbs, collections)
3. Bet Multiplier Calculator — for games where bet sizing affects EV
4. Info Only — for machines where AP viability is marginal or data is insufficient
All 150 calculators are free, no signup required: https://slotstrat.com/calculators
I also wrote up guides for each machine covering what to look for, when to play, and when to walk. Those are at https://slotstrat.com/machines
What I'd love feedback on:
- Are my EV formulas reasonable? I've tried to be conservative but I know this crowd has deeper math chops than I do
- Are there machines I'm missing that should be included?
- Any errors in my trigger point data?
I'm not selling anything here — the calculators and guides are all free to use without an account. I built this because I wanted a better tool than doing napkin math on my phone at the casino, and figured other people might too.
Happy to share the methodology in more detail if anyone wants to dig into the numbers.
