Spin Clockthe time and money arithmetic of a session
Instruments

Instrument 1 · The hour

What an hour of spins costs on average

Enter a bet, a pace, a session length and the game's return figure. The arithmetic gives the expected cost: the average loss the return figure implies over that many spins.

$
Total bet for one spin. 0.01–100.
/min
Your own pace; the default is an invented example. 0.5–60.
min
1–600.
%
If the game states a return figure, enter it; the default is invented. 50–100.

Results update as you type.

Spins
600
Turnover
$600.00
Expected cost of the session
$60.00
Expected cost per hour
$60.00

600spins
One full ring is an hour; longer sessions show a full ring.

Worked by hand, with the defaults

  1. Spins: 10 a minute × 60 minutes = 600.
  2. Turnover: 600 × $1.00 = $600.00.
  3. Expected cost: $600.00 × (100% − 90%) = $600.00 × 0.10 = $60.00.
  4. Per hour: $60.00 for 60 minutes = $60.00 an hour.

What “expected cost” means

It is the average loss the return figure implies, not a forecast of one session. A single session can finish above or below it, sometimes far from it; the spread instrument shows how far.

Why time matters

The cost grows with the number of spins, and the number of spins grows with time and pace. Doubling the session length doubles the turnover and the expected cost; so does doubling the pace.

The other instruments

  1. 2Turnover and net lossWhy the amount bet is larger than the amount lost
  2. 3What the return figure costsCost per $100 bet at returns from 85% to 97%
  3. 4How far one session can landThe range most sessions fall in, from an invented game
  4. 5Limits in numbersTurning a money or time limit into spins and minutes