MEASUREMENT

Betting ROI Calculator: Formula, Examples & Win Rate

inplayLABS · Published October 9, 2026 · Updated October 10, 2026 · AI-assisted educational guide

Betting ROI answers a narrow question: how much net profit or loss did your settled bets produce relative to the money you wagered? It describes past results. It does not predict the next bet.

Want to review the wagers behind the number? Take a look inside LABS Tracker ↗.

The formula

ROI = net profit ÷ total stakes × 100

Net profit is the total money returned from the bets, minus their stakes. Total stakes is the sum of money wagered, not your starting bankroll. If the same $20 was wagered five separate times, it contributes $100 to the stake total.

For example, $1,000 staked with $1,080 returned produces $80 net profit and an 8% ROI. If only $920 was returned, net profit is −$80 and ROI is −8%. A zero-stake sample has no meaningful ROI.

Keep your stakes and settled returns together so you can review the same records each time. Explore LABS tracking options.

Why averaging individual ROIs can be wrong

Consider a $10 bet that wins $10 net profit and a $100 bet that loses. Their individual ROIs are 100% and −100%, but averaging those percentages produces 0%, which hides the size of the loss.

The combined result is −$90 net profit on $110 staked. Combined ROI is approximately −81.82%. Add the profits and stakes first, then divide. This weights the calculation by the actual money wagered.

Decide how to count pushes and voids

A push returns the stake and produces zero net profit. You can include its stake when measuring all settled betting activity, provided you do that consistently. A void is usually excluded from an action-only stake total because the bet was cancelled. Label both in your log and state the reporting rule.

If you compare two dashboards, confirm that they use the same rule. Different treatment of refunded stakes can change the denominator even when the net profit matches. Unsettled bets should not be mixed into a settled-results calculation.

Separate promotions and account movements

Deposits and withdrawals are transfers, not wagering profit. Free bets and bonus credits may have different stake-return rules. Track them separately instead of treating every credit as ordinary cash profit. Keep currencies separate unless you have an explicit, consistent conversion method.

Cash-outs need the actual settled return. If a $50 wager returns $35 after a cash-out, net profit is −$15. The original odds do not override the settlement.

ROI is different from win rate and bankroll growth

Win rate counts wins relative to bets. It does not account for prices or unequal stakes. Bankroll growth compares an account balance over time, which can also reflect deposits, withdrawals and unsettled wagers. ROI compares betting net profit with betting stakes.

A good report can show all three, with clear definitions. None proves that a short run will continue. Use the same date range and settlement rules when comparing periods.

Make the number useful

Check your log before interpreting the percentage. Missing losses, duplicate entries and confusing payout with profit can produce a flattering but inaccurate result. Then review ROI alongside sample size, total money risked and the sports or markets involved.

Start with a consistent bet log. LABS can help organize your own wagers and review your results; check your product access for the reports available to you. Historical profitability is not a guarantee of future results.