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The primer

iGaming in 10 numbers.

Ten cited figures that explain online gambling — how big it is, where the harm concentrates, and the small-but-certain maths underneath. Every number is primary-sourced and dated. Nothing here is advice; it is understanding. 18+.
How big it is
01
≈ 448.7 million
adults worldwide experiencing any-risk gambling

Roughly one in twenty adults on Earth. Gambling is not a fringe activity — which is exactly why understanding it matters.

The Lancet Public Health, 'The Lancet Public Health Commission on gambling' thelancet.com
02
48% overall · 28% excluding lottery-only
of GB adults gambled in the past four weeks

Nearly half — and over a quarter once you set the lottery aside. Mainstream, everyday behaviour.

Gambling Commission, 'Gambling Survey for Great Britain — Annual report 2024: Headline statistics' gamblingcommission.gov.uk
Where the harm concentrates
03
≈ 80 million
adults worldwide with gambling disorder or problematic gambling

A conservative global estimate. Harm is real and measurable, not moral panic.

The Lancet Public Health, 'The Lancet Public Health Commission on gambling' thelancet.com
04
15.8% of adults · 26.4% of adolescents
gambling-disorder rate among people who use online casino / slot products

The harm is not spread evenly — it concentrates in the fastest, most continuous products. Format matters more than most people think.

The Lancet Public Health, 'The Lancet Public Health Commission on gambling' thelancet.com
05
2.7%
of GB adults score PGSI 8+ (problem gambling)

The population-wide rate looks small until you multiply it by the population — and it climbs sharply among heavy online-product users.

Gambling Commission, 'Gambling Survey for Great Britain — Annual report 2024: PGSI' gamblingcommission.gov.uk
The maths that guarantees the house
06
2.70%
house edge — European (single-zero) roulette

Every €100 staked returns about €97.30 over the long run. The edge is small per spin — and inescapable over volume.

Wizard of Odds, 'House Edge of Casino Games Compared' wizardofodds.com
07
5.26%
house edge — American (double-zero) roulette

One extra pocket nearly doubles the edge. The rules of the specific table decide the cost, not luck.

Wizard of Odds, 'House Edge of Casino Games Compared' wizardofodds.com
08
0.28% (liberal Vegas rules)
house edge — blackjack with basic strategy (liberal rules)

Skill shrinks the edge to almost nothing — but never below zero. The house still wins on average; it just wins slower.

Wizard of Odds, 'House Edge of Casino Games Compared' wizardofodds.com
09
2% to 15%
house edge — a typical slot machine

The widest range of any game, and it is never printed on the machine. What you cannot see, you cannot compare.

Wizard of Odds, 'House Edge of Casino Games Compared' wizardofodds.com
10
1 in 139,838,160
odds of the EuroMillions jackpot

For scale: you are far more likely to be struck by lightning. The jackpot is a story the ticket tells you, not a plan.

EuroMillions, 'Odds of Winning' euro-millions.com

Put together, the numbers tell one honest story: gambling is huge and mostly ordinary, harm is real and concentrates in the fastest products, and the maths underneath is small per bet yet certain over time. That is the whole game, before any marketing. Go deeper in the lessons, see the full cited figures, or if the numbers hit close to home, check where you stand and get help.

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