Part I: Games & Gaming · Slot Machines & Electronic Gaming

PAR Sheet

Slot Technology

A confidential mathematical document provided by the slot machine manufacturer that specifies the complete probability and accounting profile of a slot game. PAR stands for “Probability Accounting Report.” The PAR sheet details: the payback percentage (RTP), the hold percentage (casino’s theoretical win), the hit frequency, the symbol distribution on each virtual reel, the volatility index, and the confidence intervals for expected performance. It is the definitive reference for determining whether a machine is performing within expected parameters. Slot managers and compliance officers use PAR sheets as the benchmark against which actual meter readings are compared.

In practice

PAR sheets are proprietary and typically not disclosed to the public. Casinos must maintain them on file for regulatory inspection. A PAR sheet may span hundreds of pages for complex multi-feature games.

One entry from the Casino Industry Glossary — 1,157 terms written for surveillance, compliance and operations professionals rather than for players. Definitions describe industry usage; where a term carries a regulatory meaning, verify against the instrument that governs your jurisdiction.