Betting Unit Size — How Big One Unit Should Be, and When to Resize It
Researched and drafted with AI assistance from published sources; published by LokeNessiSport Editorial Team · Last updated: 17 August 2026
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What a "Unit" Is and Why It Helps
In betting, a "unit" is a standard stake expressed as a share of your betting bankroll, rather than as a cash amount. Instead of thinking "I bet $50" or "I bet $500", you think "I bet 1 unit" or "0.5 units".
Thinking in units helps because cash amounts trigger emotions. Losing $1,000 over a bad weekend can feel like a disaster and create an urge to win it back; if your unit is $1,000 on a $100,000 bankroll, the same loss is one unit, a normal swing. Units also make your record comparable over time and with other people's.
Key takeaway: A unit is a fixed share of your bankroll. Betting in units keeps stakes consistent and makes losses easier to put in proportion.
A Simple Setup: 1 Unit = 1% of Your Bankroll
A common setup is to define one unit as 1% of a betting bankroll that is kept separate from all other money.
How that might look:
- Betting bankroll: $10,000.00, money you can afford to lose.
- 1 unit: $100.00 (1% of the bankroll).
- Standard bet: 1 unit ($100.00).
- Bet where you believe the edge is larger: up to 1.5 units ($150.00), if your records show your edge estimates are reliable.
- Long-odds or speculative bet: 0.25 to 0.5 units ($25.00 to $50.00).
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- Maximum on any single bet: a fixed ceiling, for example 2.5 units ($250.00).
At 1% per bet, ten losses in a row cost 10% of the starting bankroll. At 5% of the starting bankroll per bet, the same run costs half of it.
Unit Sizing and Drawdown Recovery:
- Base_Unit_Value = Bankroll / 100.0
- Required_Gain_To_Recover = [Drawdown% / (1.0 - Drawdown%)] × 100
- Loss_Streak_Probability(k) = (1.0 - p)^k for k losses in a row starting from a given bet
- A 50% drawdown needs a 100% gain to get back to where you started.
Drawdowns and What It Takes to Recover ($10,000 bankroll, $100 unit, odds 1.91 so each win makes $91; arithmetic)
- 10% drawdown: $9,000 left; a gain of 11.1% needed; about 11 net winning bets
- 20% drawdown: $8,000 left; a gain of 25.0% needed; about 22 net winning bets
- 30% drawdown: $7,000 left; a gain of 42.9% needed; about 33 net winning bets
- 50% drawdown: $5,000 left; a gain of 100% needed; about 55 net winning bets
- 75% drawdown: $2,500 left; a gain of 300% needed; about 83 net winning bets
"Net winning bets" means wins in excess of what is needed to cover the losing bets along the way, so the real number of bets is much higher.
When to Resize Your Unit
If you never change the cash value of your unit, its size relative to your bankroll drifts. If your bankroll doubles from $10,000 to $20,000 and you still bet $100, you are now betting 0.5% per bet. If it falls to $8,000 and you still bet $100, you are betting 1.25% per bet, more risk just when you have less money.
A simple fix is to recalculate the unit on a schedule (for example on the 1st of each month) or when the bankroll crosses set levels (for example up 20% or down 15%).
- Monthly Reset: Recalculate 1 unit = 1% of your settled balance at the start of each month.
- Drawdowns: A smaller unit after losses slows further losses.
- Growth: A larger unit after gains lets stakes grow with the bankroll.
- Rules, Not Feelings: Fixed rules stop you changing stakes because of how you feel about recent results.
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How Long Losing Streaks Can Run
Even a bettor with a real edge has long losing runs. Take a bettor who wins 55% of bets at 1.91 (so loses 45%), which would be a strong record. The chance of at least one run of losses of a given length (calculated with a simple model of independent bets):
- Over 500 bets: a run of 5 or more losses: about 99.5%; 6 or more: about 90%; 8 or more: about 37%; 10 or more: about 9%; 14 or more: about 0.4%
- Over 1,000 bets: a run of 8 or more: about 60%; 10 or more: about 17%; 12 or more: about 4%
Runs of 5 or 6 losses are close to certain over a season; longer runs are less likely but still happen. Size your units so that a run of 10 losses is an annoyance rather than a disaster, and remember that a bettor without an edge faces longer runs than these.
The Downswing Rule: Losing runs are part of betting even with a real edge. Choose a unit size you could keep using after 10 losses in a row.
Worked Example: A Drawdown Under a 1% Unit
A hypothetical example. A bettor starts the season with a $25,000 betting bankroll, so 1 unit = $250.
Over 22 bets a run of bad results leaves the record at 4 wins and 18 losses. At 1.91 that is 4 × 0.91 − 18 = −14.36 units, about −$3,590. The bankroll is now about $21,410, still 85.6% of the start.
Following the monthly reset, the unit becomes about $214. The bettor takes a short break, checks whether the losing bets were well priced (for example against the closing price), and continues only if the process still looks sound.
At 4% of the starting bankroll per bet, the same 4-18 run would have cost about 57% of the bankroll (14.36 × 4% ≈ 57%), which is very hard to recover from.
- Emotional Control: Small units make it easier not to chase.
- Time for an Edge to Show: Small units let you survive long enough for results to reflect skill, if there is any.
- Money Kept Separate: You never need to top up the bankroll from other savings.
- Process First: Review the decisions, not just the results.
Unit Sizing Checklist
- Set a Separate Bankroll: Decide an amount you can afford to lose, and define 1 unit as 1% of it.
- Cap Any Single Bet: For example at 2.5 units, however confident you feel.
- Recalculate on a Schedule: Adjust the cash value of a unit monthly, based on your settled balance.
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- Shrink After Drawdowns: Reduce the unit when the bankroll falls by a set amount, for example 15%.
- Maintain More Than One Sportsbook Account: Holding accounts with several books (Thunderpick is one we hold a partner account with) lets you compare prices, but only deposit money you can afford to lose and never more than your unit plan allows.
Key takeaway: A unit of about 1% of a separate bankroll keeps losing runs survivable. Resize it on a schedule, cap single bets, and expect long losing streaks even with an edge.
Units and staking plans do not make betting safe or profitable. Only bet what you can afford to lose; see our responsible gambling page for tools and free support. 18+.
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Frequently Asked Questions
How much should one betting unit be?
A common setup is 1% of a betting bankroll kept separate from all other money: $100 on a $10,000 bankroll. At 1% a run of ten losses costs 10% of the starting bankroll; at 5% per bet the same run costs half of it.
How long can a losing streak last if I am a winning bettor?
Longer than most people expect. For a bettor who wins 55% of bets at 1.91, a simple model gives about a 90% chance of at least one run of six losses over 500 bets and about a 9% chance of ten or more. Size units so that ten losses in a row is survivable.
When should I change my unit size?
On a schedule or at set levels, not after how you feel about recent results: for example, recalculate 1 unit as 1% of your settled balance on the first of each month, or when the bankroll is up 20% or down 15%.
How much do I need to win back after a drawdown?
More than you lost, in percentage terms: required gain = drawdown / (1 - drawdown). A 20% drawdown needs a 25% gain, a 50% drawdown needs 100%, and a 75% drawdown needs 300%, which is why small units matter.