run the slots
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run the slots
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Turn a hit frequency (“1 in N”) into real session probabilities: the chance you hit at least once, the expected number of hits, and how many spins you need for a given confidence level.
Hit Frequency (1 in N)
The published frequency — 15 for a 1-in-15 game
Spins
How many spins you plan to play this session
Expected Hits Is an Average
Expected hits is a long-run average, not a guarantee. A 1-in-15 game can easily go 40+ spins with no hit, and the 95% range shows how far above or below the average a single session can realistically land.
Chance of ≥1 Hit
99.90%
More likely than not to land at least one hit in 100 spins.
Expected Hits
6.7
Long-run average — not a guarantee for any one session.
Chance of Zero Hits
0.10%
95% Range of Hits (approx.)
1.8 – 11.6
Normal approximation — weak when expected hits are very low.
Spins for 50% Chance
11
Spins for 90% Chance
34
Spins for 99% Chance
67
Inputs
The published hit frequency — enter 15 for a 1-in-15 game.
How many spins you plan to play in the session.
Not sure how many spins you’ll get? A steady pace is about 600 spins per hour, so a one-hour session is roughly 600 spins and a quick 10 minutes is around 100. Enter your spin count above to see the odds for that session length.
A hit frequency of 1 in N means the per-spin probability is p = 1 / N. The chance of landing at least one hit over n spins is 1 − (1 − p)ⁿ, and the expected number of hits is simply n × p.
Remember that expected hits is an average, not a guarantee. A 1-in-15 game can easily go 40+ spins with no hit — the “95% range” above shows how wide that swing realistically is.
This is an informational probability tool — it tells you the odds of hitting, not whether a machine is +EV. Use the EV or Must-Hit-By calculators for play/skip decisions.