Units and ROI in sports betting, explained
Dollar results depend on bet size. Units and ROI let you compare any two bettors on the same scale.
The short answer
A unit is a standard bet size, often 1% to 2% of a bankroll. Units won is the net result in those units. ROI is units won divided by units risked. On Handicapper Watchdog every pick risks 1 unit at the posted price.
What a unit is
A unit is a fixed bet size that lets bettors talk about results without revealing their bankroll. If your unit is $50, a 1 unit bet is $50 and a result of plus 10 units is plus $500.
How units won is calculated
Suppose a handicapper goes 55 and 45 at minus 110, risking 1 unit on each pick. Each win returns 100/110 = 0.909 units. Wins: 55 × 0.909 = 50.0 units. Losses: 45 × 1 = 45 units. Net: plus 5.0 units.
How ROI is calculated
ROI = units won / units risked. In the example, 100 picks at 1 unit each risk 100 units, so ROI = 5.0 / 100 = 5.0%. ROI lets you compare a handicapper with 300 picks to one with 3,000, and a favorite bettor to an underdog bettor.
Traps in how results are reported
- To win versus to risk. Some services grade every pick to win 1 unit, which makes favorites look cheaper than they are. Always ask which method is used.
- Variable units. A 5 unit play that wins and 1 unit plays that lose can hide a losing record.
- Missing prices. Units won is only real at a price that was available when the pick was posted.
Handicapper Watchdog risks 1 unit on every pick at the posted price, or at a reference price when a post has none. How we grade explains the rest.
Common questions
What is a good ROI in sports betting?
Over a large sample, a sustained ROI of 3% to 5% at standard prices is very good. Double digit ROI over hundreds of picks is rare.
Is units won or ROI more important?
ROI shows quality, units won shows volume. A handicapper with a high ROI over a small sample may simply be lucky, so read both alongside the number of picks.
How big should a betting unit be?
Many bettors use 1% to 2% of their bankroll. Only bet money you can afford to lose.
See the graded records
2,773 handicappers, 51,414 picks graded from public posts made before the game.
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Updated October 29, 2026. Past results are not predictions. 21+. Gambling problem? Call 1 800 GAMBLER.