Bankroll management and betting units explained
By the Match Tail team ·
Good picks do not help if one bad week empties your account. Bankroll management is the boring part of betting that keeps you in the game long enough for good decisions to matter. This guide explains bankrolls and units, compares flat and percentage staking with worked numbers, and lists the mistakes that do the most damage.
What is a betting bankroll?
A betting bankroll is the money you set aside only for betting, separate from rent, bills and savings. You decide the amount once, at a level you could lose without it changing your life. Every stake is then sized from that bankroll, never from whatever happens to be in your checking account that day.
Keeping the bankroll separate does two jobs. It caps how much you can lose, and it gives you a number to measure against. If you started with $1,000 and now have $1,150, you know exactly how you are doing. You can keep it in the sportsbook account itself or in a separate bank account, so it never mixes with living money.
Only bet money you can afford to lose. A bankroll is not an investment account, and no staking plan turns losing bets into winning ones.
What is a unit in sports betting?
A unit is your standard stake, set as a small percentage of your bankroll. If your bankroll is $1,000 and one unit is 1%, a unit is $10. A two-unit bet is then $20. Units let bettors with very different bankrolls compare results and follow the same picks at a size that fits each of them.
Unit = bankroll × percentage: 1,000 × 1% = $10
Stake = units × unit value: 2 × $10 = $20
Profit = units won × unit value: 5 × $10 = $50, or 5 × $500 = $2,500
| Bankroll | 1% unit | 2% unit | 5% unit |
|---|---|---|---|
| $500 | $5 | $10 | $25 |
| $1,000 | $10 | $20 | $50 |
| $2,500 | $25 | $50 | $125 |
Record your results in units as well as dollars. "Up 5 units" means the same thing to a bettor with a $500 bankroll and to one with $50,000. At a $10 unit it is 5 × $10 = $50 of profit; at a $500 unit it is 5 × $500 = $2,500. This is also how you follow someone else’s picks: copy their units, not their dollars. Our guide to copy betting works through that conversion.
How does flat staking work?
Flat staking means betting the same dollar amount on every bet, no matter how the bankroll moves. You pick a unit, such as $20 on a $1,000 bankroll, and stake $20 every time. It is the simplest plan to follow and track. The downside is that the stake does not shrink when the bankroll does.
After 10 straight losses: 1,000 − (10 × 20) = $800
Profit per win at -110: 20 × (100 ÷ 110) = $18.18, settled to the cent
After 10 straight wins: 1,000 + (10 × 18.18) = $1,181.80
Losses to empty the bankroll: 1,000 ÷ 20 = 50 in a row
Fifty losses in a row is unlikely, but shorter losing runs are far more likely. If each bet has a 50% chance and the bets are independent, five losses on any given five bets has a 0.5^5 × 100 = 3.125% chance. Over hundreds of bets, runs like that can happen.
How does percentage staking work?
Percentage staking means betting a fixed share of your current bankroll, so the stake changes after every result. At 2%, a $1,000 bankroll stakes $20. After a loss it is $980, so the next stake is $19.60. Stakes shrink in losing runs and grow in winning runs, which protects the bankroll automatically.
| After | Flat $20 | 2% of current |
|---|---|---|
| 10 straight losses | $800.00 | $817.07 |
| 10 straight wins at -110 | $1,181.80 | $1,197.43 |
Each loss keeps 98% of the bankroll: 1,000 × 0.98^10 = $817.07
Each win at -110 adds 2% × (100 ÷ 110) = 1.8182%
After 10 wins: 1,000 × 1.018182^10 = $1,197.44 before rounding
Settling each stake and payout to the cent instead gives $1,197.43
Percentage staking loses less in a bad run and gains a bit more in a good one. The trade-off is more arithmetic: you recalculate the stake every time. A practical middle ground is to recalculate the unit once a week or once a month instead of after every bet.
How big should a betting unit be?
We suggest a unit of 1% to 2% of your bankroll. The smaller the unit, the longer a losing run has to be before it does serious damage. With flat stakes, losing half the bankroll takes 50% ÷ 2% = 25 straight losses at a 2% unit, but only 50% ÷ 5% = 10 at a 5% unit.
| Unit | Flat staking | Percentage staking |
|---|---|---|
| 1% | 50 | 69 |
| 2% | 25 | 35 |
| 5% | 10 | 14 |
Flat: half the bankroll ÷ stake, so 50% ÷ 1% = 50, 50% ÷ 2% = 25, 50% ÷ 5% = 10 losses
1%: 0.99^68 = 0.5049, 0.99^69 = 0.4998, so 69 losses
Percentage: losses until (1 − unit)^n falls below 0.5
2%: 0.98^34 = 0.503, 0.98^35 = 0.493, so 35 losses
5%: 0.95^13 = 0.513, 0.95^14 = 0.488, so 14 losses
If a pick seems extra strong, a tipster may call it a two- or three-unit play. Keep any single bet at or below about 5% of the bankroll, however confident anyone sounds.
What bankroll mistakes should you avoid?
The costliest mistakes are chasing losses with bigger stakes, raising your unit after a lucky week, betting more on "sure things", and mixing betting money with living money. Each one makes the size of your bets depend on your mood instead of your plan, which is exactly what a bankroll exists to stop.
Stakes after each loss: 10, 20, 40, 80, 160, 320
Total lost after six losses: 10 × (2^6 − 1) = $630
Seventh stake: 10 × 2^6 = $640. At +100 a win pays $640: 640 − 630 = $10 ahead
At -110 the same win pays 640 × (100 ÷ 110) = $581.82, so 581.82 − 630 = −$48.18
- Set the bankroll once, and write the number down.
- Pick a unit of 1% to 2%, and stake in units only.
- Log every bet: date, pick, odds, units, result.
- Review the unit on a fixed schedule, not after a big win or loss.
- Keep parlays to a fraction of a unit. Our parlay math guide shows why.
- Staking plans control risk; they do not create an edge. Only bets with positive expected value do that.
- If you copy bets from Match Tail or anyone else, size each one with your own unit, not someone else’s dollars.
What else should you know?
How many units should I bet per pick?
Most picks should be one unit. Reserve two units for the bets you have the strongest reason to like, and keep any single bet at or below about 5% of your bankroll.
What does "up 5 units" mean?
It means 5 units of profit. At a $10 unit that is 5 × $10 = $50; at a $100 unit it is 5 × $100 = $500. Units make results comparable across bankrolls.
Should I raise my unit after a winning run?
Only on your fixed review date, and only by recalculating the same percentage of the new bankroll. Raising it on a hot streak is how a good month turns into a bad one.
Only bet money you can afford to lose. If betting stops being fun, call or text the National Problem Gambling Helpline at 1-800-MY-RESET (1-800-697-3738).