TipsterCheck

Free tool

Tipster Variance & Sample-Size Simulator

How many bets do I need to judge a tipster?

Luck dominates short records. A tipster with zero real edge, betting at average odds of 3.0, shows a profit over 100 bets almost half the time, and an ROI above 15% about 1 time in 7. You need several hundred bets — ideally 1,000+ at higher odds — before results say much about skill.

How it works

  • Each simulated bet wins with probability (1 + true edge) ÷ decimal odds, so a 0% edge is a genuinely break-even tipster.
  • A win returns odds − 1 points and a loss costs 1 point. We repeat the record thousands of times and measure the spread of final ROI.
  • The wider the spread, the less a single record can tell you. Higher odds and fewer bets both widen it.

Worked examples

0% edge, odds 3.0, 100 bets

Almost half of break-even tipsters finish in profit, and about 1 in 7 show 15%+ ROI — purely by luck.

5% edge, odds 3.0, 100 bets

A genuinely good tipster still finishes in a loss in nearly 4 out of 10 100-bet stretches.

0% edge, odds 6.0, 500 bets

Even at 500 bets, about 1 in 14 break-even outsider tipsters shows 15%+ ROI — enough to look like a star.

Frequently asked questions

Several hundred at the very least, and more for tipsters who back big-priced selections. Short-priced tipsters settle down faster; outsider tipsters can need well over 1,000 bets before their ROI reflects skill rather than luck.

Six reviews is a tiny sample, just like a short betting record. Reviewers may have followed during a lucky run. That's why TipsterCheck only shows a Trust Score after 5 reviews and weighs review volume and recency, not just the star average.

It's the tipster's real long-term ROI if they placed infinite bets. A 0% edge is break-even, 5% is very good and negative values represent losing tipsters. The simulator shows how differently that same edge can look over a short record.

Yes. Run the simulator with a negative edge such as −5% at odds of 4.0 over 100 bets, and about a third of records still finish in profit. Tipsters who only advertise their best runs are relying on exactly that.

It's a simplified model with independent bets at fixed odds and level stakes. Real records vary more, because odds differ and tipsters may change staking, so treat the results as a minimum level of uncertainty.
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For education only, not financial advice. 18+. When the fun stops, stop — BeGambleAware.org.

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