Split your total stake across both sides of an arb. Enter odds in any format — American, Decimal, or Polymarket. Results update instantly. Cap a stake when a book limits you and the other legs rebalance so your profit % stays the same. Tap the i icons for help on each control. How to use this calculator ↓
Optional — only if you use the dashboard bet tracker.
Quick reference
American odds
+130 means bet $100 to win $130. -115 means bet $115 to win $100. Enter with + or − sign.
Decimal odds
Your total return per $1 staked, including stake. 2.30 = $1 bet returns $2.30. Always greater than 1.00.
Polymarket price
Probability between 0.00 and 1.00. Converts to decimal odds automatically (e.g. 0.43 = 2.326 decimal).
Cap stake
When a book caps your stake, enter the cap and tap Cap stake. All other legs scale down proportionally — profit % is unchanged.
Rounding your stakes
Stakes are shown to the exact cent. A suggested rounded amount appears below each stake — under $150 per leg it suggests the nearest $1, over $150 it suggests the nearest $5. Rounder numbers look less suspicious to books and the profit difference is usually small.
How to use the calculator
From Telegram alert to placed arb
Same checklist as How do I place an arbitrage bet? — this is the calculator step with visuals. Odds from an alert deep-link are usually pre-filled; always re-check what the books show before you bet.
1
Open from the alert (or start blank)
Tap Calculator on a Telegram arb. Legs, odds, and books load automatically. Or open this page and type them in yourself — one format per leg is enough (American or decimal).
From alertDraftKings Over 0.5 · +120
Leg 2FanDuel Under 0.5 · -110
StatusArb confirmed · profit updates live
2
Set your Total stake (not your whole bankroll)
Enter how much you want to put on this arb across both books. The calculator splits it so each outcome returns about the same. Change currency if you track in USD.
Total stake$1,000
Suggested split$475 / $525
Guaranteed profit~$24 on $1,000
3
If a book caps you — use Cap stake
Tap Cap stake on that leg, type the max the book will take, and the other leg shrinks automatically. Profit % stays the same; dollar profit drops with size. Don’t freestyle uneven stakes unless you turn on Type my stakes.
DraftKingsCapped at $200
FanDuelRebalanced automatically
ResultSame % · smaller $ profit
4
Place the amounts shown — then verify
Use the breakdown stakes at each book. Prefer the harder/thinner side first, then the other immediately. Confirm both tickets match the same event, line, and amounts. Optionally Record Bet in Dashboard for tracking.
PlaceExact (or suggested round) stake on each book
Skip ifOdds moved and profit turns red / “no arb”
Part of the full arb checklist in the FAQ: How do I place an arbitrage bet? · 3-way soccer/hockey draws: add a third outcome with + Add outcome.