Betting ROI is one of the cleanest ways to judge your record because it compares profit to the amount you risked. Win rate tells you how often you won. ROI tells you whether the wins were worth the risk. That distinction matters because two bettors can have the same win rate and wildly different results depending on odds, stake size, parlays, and price.
The math is simple. The discipline is keeping accurate inputs. Once every bet has a stake, result, and net profit attached to it, ROI becomes a straightforward measure of efficiency.
The betting ROI formula
Use this formula:
ROI = (Net Profit / Total Wagered) x 100
Net profit is your total winnings minus your total losses. Total wagered is the sum of all stakes you put at risk. If you bet $100 on ten different games, your total wagered is $1,000 even if some of those bets won.
ROI is usually expressed as a percentage. A positive number means you made money relative to what you risked. A negative number means the record lost money.
Example 1: 100 bets at $100 each
Suppose you placed 100 bets and each bet was $100. Your total wagered is $10,000. After grading every bet, your net profit is +$450.
ROI = ($450 / $10,000) x 100 = 4.5%
A 4.5% ROI means that for every $100 risked, the record returned $4.50 in profit. That may sound modest, but in sports betting it is a strong result over a meaningful sample. Small edges matter because betting is a high-volume, low-margin game.
Example 2: 60% win rate can still lose
Win rate gets a lot of attention because it is easy to understand. But it can be misleading. Imagine a bettor wins 60 out of 100 bets at -110 odds, risking $110 to win $100 each time.
Wins: 60 x $100 = $6,000
Losses: 40 x $110 = $4,400
Net profit: $1,600
In that specific case, 60% is profitable. But lower the win rate to 52% at -110 and the picture changes:
Wins: 52 x $100 = $5,200
Losses: 48 x $110 = $5,280
Net profit: -$80
That is why win rate cannot stand alone. You need price and stake context. A bettor winning 45% on plus-money underdogs might outperform someone winning 54% on expensive favorites.
Let BetShare do the ROI math.
Log your stake, odds, and result once. BetShare keeps profit and ROI current as your record grows.
Auto-Calculate Your ROI →Units vs dollars
Many experienced bettors track in units because units normalize stake size. If your standard bet is $25, one unit is $25. If someone else's standard bet is $100, one unit is $100. Comparing records in units lets you discuss performance without making the conversation only about bankroll size.
Dollars still matter for your personal bankroll, but units make review cleaner. A +12 unit season is easier to compare than a dollar figure without knowing the bettor's normal stake. The key is consistency. Define your unit size, avoid changing it constantly, and note when you intentionally risk more or less.
What is a good betting ROI?
A long-term ROI between 1% and 5% is solid. Above 5% over a meaningful sample is sharp. Anything claiming 20% or more over a large, verified sample deserves skepticism. It may be possible in a short run, a niche market, or a small sample, but huge edges tend to shrink as volume grows.
The sample size matters as much as the number. A 12% ROI over ten bets tells you very little. A 3% ROI over 1,000 tracked bets is far more interesting. That is why the first job is to build a complete record. Our guide on how to track bets covers the fields you need before the ROI number becomes reliable.
Common ROI calculation mistakes
The most common mistake is using total returns instead of net profit. If you risk $100 and win $90.91 at -110, your profit is $90.91, not $190.91. The returned stake is not profit.
- Ignoring pushes: a push returns the stake and should not add profit or loss.
- Wrong stake on parlays: use the actual amount risked on the whole parlay.
- Mixing odds formats: convert fractional, decimal, and American odds consistently.
- Changing unit size silently: record the context when your standard stake changes.
- Counting bonuses loosely: decide how promos and free bets are treated, then be consistent.
ROI is only as trustworthy as the record behind it. If losses are missing, pushes are counted incorrectly, or parlay stakes are inflated, the percentage can look better than reality.
How BetShare auto-calculates ROI
BetShare connects the pieces for you: stake, odds, result, profit, and total wagered. As your bets are logged and graded, your ROI updates automatically so you are not rebuilding formulas after every slate.
That makes the review habit easier. You can spend less time checking arithmetic and more time asking better questions: which sports are profitable, which bet types are leaking, whether your units are consistent, and where your strongest edge actually lives. For a broader look at tracking workflows, read our betting tracker app roundup.
Track ROI without babysitting formulas.
BetShare keeps your betting record, profit, and ROI in one place from day one.
Auto-Calculate Your ROI →