Most bettors don't lose because their picks are bad. They lose because their bets are too big, inconsistently sized, and managed emotionally. This is the fix.
A bankroll is money set aside specifically for betting — separate from rent, food, or any expense that matters. If the number hurts to lose, it's not a bankroll. It's rent money with a bet on it.
Pick a number you could watch drop 50% without making worse decisions. That's your bankroll. Everything below compounds from there.
Imagine two bettors with the same 55% win rate at decimal odds of 2.00 (a modest but real edge). Over 1,000 bets:
| Stake per bet | Chance of going broke | Expected bankroll after 1000 bets |
|---|---|---|
| 1% of bankroll | Near zero | ~2,680% of start |
| 5% of bankroll | ~15% | ~900% of start (if survived) |
| 10% of bankroll | ~50% | Variable — ruin likely |
| 25% of bankroll | ~95% | Broke before edge plays out |
Figures are illustrative Monte-Carlo approximations for a 55% edge at even odds. Exact numbers vary with odds distribution, but the pattern — larger stakes means higher ruin probability — is mathematical certainty, not opinion.
Stake the same fixed amount on every bet. Example: £10 per bet, regardless of odds or confidence.
Best for: beginners, anyone who isn't sure their edge is real, anyone who wants simple accounting.
Weakness: doesn't scale with bankroll growth. If you double your bankroll, £10 becomes tiny. If you lose half, £10 becomes dangerous.
Stake a fixed percentage of your current bankroll. Example: always 2% of whatever the bankroll is right now.
Best for: bettors with a proven edge, anyone running for the long term, anyone tracking performance seriously.
Strength: bets grow when you win, shrink when you lose — automatic protection against ruin.
Weakness: requires recalculating per bet. Emotional discipline needed during losing streaks (your 2% is now smaller).
A mathematical formula that calculates the optimal stake based on your edge and odds.
Example: bet at 2.50 decimal, you estimate 50% win probability. Then b = 1.5, p = 0.5, q = 0.5. Kelly = (1.5 × 0.5 − 0.5) / 1.5 = 0.167. Stake 16.7% of bankroll.
Best for: serious bettors who track their performance rigorously, have a sample size of 500+ bets, and know their true win rate by category.
Don't use Kelly if: you're estimating edge based on feel, you have fewer than 200 tracked bets, or you don't have discipline to stick with it during drawdowns.
Instead of saying "£50 per bet," pros talk in units. One unit = your base stake (typically 1% of bankroll). A "3-unit bet" is three times your base.
Why? It makes bankroll changes invisible in your record. A 1-unit bet when bankroll was £1,000 (£10) and a 1-unit bet when bankroll is £5,000 (£50) both count as "1 unit" — your win rate and ROI stay comparable across bankroll sizes.
Down £200 after a bad day → doubling next stake to "win it back." This single behaviour ends more betting careers than any other. Your next bet has zero memory of your last bet. The coin doesn't owe you anything.
If you notice yourself wanting to chase, stop betting for 24 hours. A tracker that flags loss-streaks for you (Zort does this automatically) is one of the best tools against this bias.
Up £500 after a good week → jumping stakes because "I'm hot." Hot streaks feel predictive. They aren't. A 55% bettor can easily win 7 of 10 in a row; the probability of making the next bet 3× larger because the previous 7 hit is a statistical mistake.
Untracked bettors overestimate their win rate by up to 40%. Losing bets disappear from memory faster than winning ones — a documented pattern called selective memory bias. The only defence is tracking every bet, every time, automatically. That's literally why Zort exists.
If you're starting out, this is defensible:
Zort's responsible gambling tools — available free — let you set stake limits, cool-off periods, and spending alerts. The analytics show you exactly which staking approach has worked for you historically (compare flat vs scaled, by sport, by odds range).
Zort Pro adds streak tracking, drawdown analysis, and risk assessment that flags when your stake sizes are drifting outside your stated strategy. But the core bankroll tools — stake limits, wellness alerts, loss streak detection — are free in every tier.
Track every bet automatically. See true ROI, true win rate, and exactly where your edge lives.
Download Zort free