Slot Session Comparison Calculator
Compare two slot-session plans by RTP, volatility, bet size, spin count, pace and optional bankroll. This page explains which plan has higher theoretical exposure; it does not identify a game version, predict a session, model jackpots or recommend play.
Privacy note: this runs in your browser. Do not enter account IDs, ticket numbers, SSN, card numbers, document IDs, bank details, passwords or private screenshots.
Responsible-play boundary: if comparison creates urgency, chasing, repeated deposits or pressure to raise stakes, stop. Call or text 1-800-MY-RESET for confidential support. State-specific resources may vary.
What this comparison owns
Use it for a side-by-side educational comparison: expected loss, hourly exposure, volatility-band width, rough stop-loss chance and pressure flag. Use the root Slots Session Estimator for one plan, or the RTP Source Checker when the RTP source is weak.
Compare two plans
Comparison result
| Output | Scenario A | Scenario B |
|---|
Rough comparison only. This is not a prediction, game recommendation, jackpot model, legal check, payout check or bankroll guarantee.
Formula registry
| Item | Current definition |
|---|---|
| Model | Slot Session Comparison Model v1.0, reviewed May 18, 2026 |
| Inputs | RTP, volatility, bet size, spin count, spins per hour, bankroll and stop-loss floor for two scenarios |
| Outputs | Expected loss comparison, hourly exposure comparison, volatility-band comparison, rough stop-loss chance comparison and pressure flags |
| Known exclusions | No jackpot odds, feature frequency, exact paytable distribution, certified simulation, operator RTP version, legality, tax, payout approval or personal suitability |
Source register
| Source | Used for | Status |
|---|---|---|
| Internal Slot Session Comparison Model v1.0 | Expected loss, hourly exposure, volatility-band width and rough stop-loss pressure comparison | Reviewed May 18, 2026 |
| Internal RTP / House Edge Model | RTP-to-house-edge and expected-loss formulas | Cross-linked to RTP Calculator |
| NCPG help route | Responsible-play stop gate and helpline wording | Checked May 18, 2026 |
QA and public fixtures
Public comparison fixtures are available at /tools/slots/compare/test-fixtures.json. They cover default comparison, higher volatility, invalid RTP, stop-loss validation and copy-summary boundaries.
| Case | Expected behavior |
|---|---|
| Default medium vs high volatility | Scenario B has wider volatility band and higher expected loss when RTP is lower. |
| Higher bet size | Expected loss and hourly exposure rise with bet size when RTP and spins are unchanged. |
| Invalid RTP | Calculation is blocked outside RTP above 0 and below 100. |
| No bankroll | Stop-loss chance is not modeled without starting bankroll. |
| Copy summary | Copied text includes the educational-only boundary. |
Changelog
May 18, 2026: launched Slot Session Comparison Model v1.0 with two-scenario expected-loss comparison, hourly exposure comparison, volatility-band comparison, rough stop-loss chance, copy summary, public fixtures, source register, no-JS formula fallback, privacy note and responsible-gambling stop gate.
Maintained and reviewed by
Maintained by: the Playbook USA Tools Team.
Reviewed for formula boundaries, privacy, commercial separation and responsible-play routing on May 18, 2026.