What does this calculator actually estimate?

It estimates how long your bankroll lasts on average given your stake, RTP, and spin pace. It uses pure expectation — actual sessions vary widely due to volatility. Cold sessions deplete faster; lucky sessions last much longer.

Why does deployed RTP matter so much for session length?

Session length is inversely proportional to house edge. Dropping from 96% (4% edge) to 92% (8% edge) halves your expected session — your bankroll dies in half the spins, even though the stake is identical.

Where does the spins-per-minute default come from?

UK slots have a 2.5-second minimum spin speed under the slowdown rules. Eight spins per minute is a realistic average once you include decision time, bonus rounds, and brief pauses.

Bankroll Duration Calculator: How Long Will Your Money Last?

LIVE DATA

Enter your bankroll, stake, deployed RTP, and spin pace. The calculator returns your expected session duration, total spins before depletion, and the real hourly cost of your play. The comparison row shows how the same bankroll behaves at your RTP versus theoretical and worst-case deployments.

Bankroll (£)

Stake per spin (£)

Deployed RTP (%)

Spins per minute

UK 2.5s minimum spin = 24 max. 8 is realistic with decision time.

Results

Total spins before expected depletion

2,500

Expected session duration

5 hours 13 minutes

Expected loss per spin

£0.02

Expected loss per hour

£9.60

Cost of entertainment per hour

£9.60

Comparable to a cinema ticket per hour.

Formula: Expected spins = Bankroll / (Stake × (1 − RTP / 100))

RTP Comparison

Same bankroll, same stake — three different deployment scenarios.

Scenario	RTP	Spins	Duration	Loss / hour
Your RTP	96.00%	2,500	5 hours 13 minutes	£9.60
Theoretical	96.50%	2,857	5 hours 57 minutes	£8.40
Worst case	87.00%	769	1 hours 36 minutes	£31.20

Your RTP96.00%

Spins2,500

Duration5 hours 13 minutes

Loss / hour£9.60

Theoretical96.50%

Spins2,857

Duration5 hours 57 minutes

Loss / hour£8.40

Worst case87.00%

Spins769

Duration1 hours 36 minutes

Loss / hour£31.20