Arbitrage Calculator: Best Odds + Stake Split
Compare Book A/B/C odds in Decimal, HK, American, Malay or Indonesian format; auto-pick best prices, calculate surebet stake splits and stress-test slippage.
Surebet detector
Cross-book surebet detector
Two-Way, Three-Way and Asian Handicap markets share one engine — every input format is normalised to Decimal odds, then implied probabilities are summed. Anything under 100% is an arb.
Tap the amount above to change it. Stakes split across every leg — profit and allocation on the right update instantly.
Decimal remains the main display format. HK odds are common in Asia; Malay odds use values between -1.00 and +1.00, such as +0.90 or -0.90. Indonesian odds use values at or beyond ±1.00, such as +1.20 or -1.20. Keep the sign — every price is converted to Decimal before BEST is selected.
On mobile, copy the odds from one sportsbook first, then the next. The calculator still picks the best Decimal-converted price for each outcome automatically.
Implied probabilities sum below 100%. Math says you can split your stake across the legs and lock a return regardless of outcome.
Change total stake on the left to update guaranteed profit and the stake split.
How is this arb calculated?
The calculator converts every price to Decimal odds, turns each outcome into implied probability, then checks whether the market totals under 100%.
- 01Implied probability = 1 ÷ Decimal odds.
- 02Add every outcome's implied probability. If the total is below 100%, a surebet exists.
- 03Stake share = each implied probability ÷ the total, so every outcome returns a similar payout.
1/2.10 = 47.62% · 1/2.05 = 48.78%
Stake split — exact dollars per leg
The bar below allocates your total stake to each leg in proportion to that leg's implied probability so all outcomes return the same dollar amount. The table beneath spells out the stake, gross payout and share for every leg.
| Book | Outcome | Stake | Payout | Share |
|---|---|---|---|---|
| Book A | Home | $493.98 | $1037.35 | 49.4% |
| Book B | Away | $506.02 | $1037.35 | 50.6% |
Pre-bet execution check
Surebets fail in the real world when prices move, fees bite or stakes need rounding. Stress-test slippage, costs and rounded stake units before you click both bets.
Advanced execution settingsOptional: adjust stake rounding, costs and odds slippage before placing bets.
The fine print
What 'guaranteed' actually costs you
The calculator can prove the math; this panel checks the real-world traps that can still turn a surebet into a bad bet.
Bookmaker limits & account flags
Retail sportsbooks can limit or close accounts that repeatedly chase short-lived misprices. Warning signs include maximum-stake patterns, late line grabs and unusual deposit / withdrawal behaviour.
Stale odds & line moves
Many surebet windows last seconds, not minutes. If one leg confirms and the other price moves, a 1–2% edge can disappear before both bets are placed.
Leg-execution & void risk
If one leg confirms but the other suspends, voids or pushes, you no longer have a locked return. Be extra careful with whole-number Asian Handicap lines.
Capital lock-up & opportunity cost
A $1,000 arb often returns only $10–$30. Keeping balances across several books can tie up more capital than the edge is worth.
The honest takeaway
Arbing can work, but it asks for speed, funding and discipline. If that overhead is too much, low-vig markets plus rakeback give a simpler way to improve long-run expected value.
Best odds per side
Best odds per side
Each row lists one bookmaker's price on one outcome. The 'BEST' chip is chosen after every input format is converted to Decimal odds, then compared by implied probability.
| Book | Outcome | Decimal | Implied | Best? |
|---|---|---|---|---|
| Book A | Home | 2.10 | 47.62% | BEST |
| Book B | Home | Empty | — | |
| Book C | Home | Empty | — | |
| Book A | Away | Empty | — | |
| Book B | Away | 2.05 | 48.78% | BEST |
| Book C | Away | Empty | — |
Math + reality
How to read your result
Use these quick rules after the calculator gives you a number. The goal is not just finding an arb — it is deciding whether the edge is still usable.
First check: is the edge big enough?
Below 0.5% is usually too thin after fees, FX or line movement. Around 1–3% is the normal retail surebet range. Above 5% deserves suspicion first — the price may already be stale.
Second check: can you place every leg?
Use the stake split only if all legs are open, limits are high enough and the odds still match the screen. If one leg needs rounding, recheck the net profit after rounding and cost.
Third check: is this worth the effort?
If the trade needs multiple accounts, fast transfers and constant monitoring for a tiny return, a low-vig market with rakeback may be the cleaner long-run choice.
How it works
Three steps to lock a surebet
Use the calculator in three moves: pick the market, enter the prices you see, then check whether the split still works after fees and line movement.
- 1
1. Pick the market and enter the odds
Choose Two-Way, Three-Way or Asian Handicap, then enter the prices exactly as your sportsbook shows them.
- 2
2. Set your total stake — splits update live
Change the total stake and the calculator instantly splits it across the winning prices for each outcome.
- 3
3. Read the arb % and ROI
Check the arb edge, guaranteed profit and ROI, then use the execution panel to see whether rounding, fees or slippage kill the trade.
Why arbing is hard
An arb is a guaranteed-profit cross-book trade
Two bookmakers price the same event differently: A pays 2.10 on Home, B pays 2.05 on Away. 1/2.10 + 1/2.05 ≈ 0.964 — under 1.00, which means the implied probabilities don't add up to a full market. The 3.6% gap is your arb edge: split your stake across both legs and you book a return regardless of which side wins.
The math is the easy part — stake split is where the real work is
Knowing an arb exists is one thing; sizing each leg so the return is identical no matter who wins is another. The Stake Split bar below allocates dollars proportional to each leg's implied probability, so the payout ladder is flat — you get the same money back whether Home wins, Away wins, or (in 3-way markets) it's a draw.
Guaranteed math. Hostile reality.
Real-world arbing has four frictions the math doesn't capture: bookmakers limit or close arber accounts on sight, prices move within seconds of sharp action hitting, leg-B can void or push while leg-A is in flight, and a 1–3% edge needs flawless execution to clear fees and exchange rates. This page walks you through the math; on the ground, sharp-priced lines plus rakeback usually beat 1% arbs that get you flagged.
All math here is universal — every regulated sportsbook prices markets the same way. The 'Book A / B / C' labels are read-only by design so this page never functions as a competitor priceboard. Risk-panel severity reflects industry consensus (account-flag risk is high, stale-odds risk varies with arb size) and is not a claim about any specific bookmaker. The Final CTA recommends XYES core markets for long-run +EV bettors — it is not a recommendation for arbers chasing risk-free 1% ROI.
Companion tools
After spotting an arb, sanity-check the lines
Skip the surebet hunt — try low-vig markets on XYES
XYES core-market vig sits near the sharp-book bracket many retail arbers chase — and every settled bet earns 0.30%–1.10% rakeback whether you win or lose. It is a simpler way to chase long-run edge without juggling multiple sportsbook balances, stale lines and split-second execution. Decimal-led display with HK, American, Malay and Indonesian odds supported. No signup, no KYC, instant crypto rails.
Common questions about arbitrage betting, surebets and stake splits
Quick answers before you risk real bankroll: legality, bookmaker limits, odds formats, market types and whether arbing is worth the effort.