What is a unit in sports betting?

A unit in sports betting is a standard bet size you choose, which you can set as a fixed share of your bankroll: 1%, for example. Measuring stakes and results in units rather than dollars makes records comparable across bankroll sizes, and keeps each bet small enough that a normal losing streak can't wipe you out.

What is a unit in sports betting, in practice

Bankroll	1% unit	2% unit	5% unit
$500	$5	$10	$25
$1,000	$10	$20	$50
$5,000	$50	$100	$250

There are two ways to apply it:

Flat units. The unit stays the same dollar amount until you deliberately resize it.
Percentage units. The unit is recalculated from your current bankroll, so it shrinks after losses and grows after wins.

How big should a unit be?

Start from the bankroll itself: a budget for betting set before you bet, from money you can afford to lose, never money meant for rent, bills or savings.^[1] Then size the unit big enough to matter to you, small enough to survive a streak. Streaks are longer than intuition suggests: by our calculation, if each bet loses half the time, a run of 10 straight losses happens in about 39% of 1,000-bet stretches.

Unit size	Bankroll lost in a 10-bet losing streak (flat)
1%	10%
2%	20%
5%	50%

For how streaks and swings scale with the number of bets, see Positive EV betting losing streaks: how long and how deep. If you have a reliable estimate of your edge on each bet, the Kelly criterion gives a principled stake size, as a fraction of your bankroll, instead of a fixed unit.^[2] See Kelly criterion betting: what it assumes and how it fails.

Reading results in units

Units won depend on the odds as well as the win rate. One unit at +150 wins 1.5 units; one unit at -150 wins 0.67. Convert prices with the odds converter before comparing records.

Record	Bets	Units won	Return on units staked
55 wins, 45 losses, all at -110	100	+5.0	+5.0%
45 wins, 55 losses, all at +130	100	+3.5	+3.5%

A record quoted in units, without the unit size, the odds and the number of bets, can't be compared with anything.

Frequently asked questions

How much is one unit in sports betting?

Whatever you define it as. With a $1,000 bankroll, a 1% unit is $10 and a 2% unit is $20. The point is consistency, not a magic number.

What does +10 units mean?

A profit of ten times your standard stake. At $20 per unit that's $200. Without the unit size and the odds behind it, the number alone tells you little.

Should units be flat or a percentage of my bankroll?

Flat units are simpler to track. Percentage units shrink after losses and grow after wins, which reduces the risk of ruin. Either is fine if each bet stays small relative to the bankroll.

Should I bet more units on bets I like more?

Only if 'like more' means a measurably bigger edge at the price. The Kelly criterion sizes stakes by edge; varying units by confidence alone just adds variance.

What is a unit in sports betting? Sizing bets by bankroll