Calculators

Parlay Payout Table

What it does: Shows every possible win/loss outcome for a multi-leg parlay and what you'd net in each scenario. All legs must win for the parlay to pay.

• Enter the odds for each leg (American or Decimal)
• Set your stake — this is the total amount you're risking on the parlay
• Hit Add Leg to build up to as many legs as you want
• The outcome table (shown for up to 5 legs) lists every combination of wins and losses with the resulting payout

The Break-even % tells you how often all legs need to win for this parlay to be profitable long-term.

Round Robin Builder

What it does: A round robin lets you hedge a multi-leg parlay by automatically generating every possible smaller parlay from your legs. Instead of needing all legs to win, you can profit if only some hit.

• Add all your legs (e.g. 4 teams), pick a combo size (e.g. 2-teamers)
• It generates every 2-leg combo — C(4,2) = 6 parlays — and shows the payout if each hits
• Total cost = stake per parlay × number of combos
• If 2 of your 4 legs win, you cash the combo containing those 2 legs and lose the rest

Round robins cost more upfront but protect you from a single bad leg busting your whole ticket.

Teaser Calculator

What it does: A teaser lets you move the point spread or total in your favor by a fixed number of points in exchange for reduced payout odds. All legs still must win.

• NFL 6-point teaser is the most common — moving through key numbers 3, 6, and 7 is where most of the value comes from
• NBA 4-point teaser is standard for basketball
• The break-even % per leg tells you how often each individual leg needs to win to make the teaser profitable at the given payout
• Key numbers highlighted in green are crossed by your teaser points — crossing 3 and 7 in NFL is considered the most valuable

The more legs you add, the higher the payout but the harder it is to win. Stick to 2–3 legs for best value.

If-Bet / Reverse Bet Calculator

What it does: Models two conditional bet types that limit exposure compared to a straight parlay.

• If-Bet: You bet Leg 1. If it wins, your profit is automatically wagered on Leg 2. If Leg 1 loses, Leg 2 is never placed — you only lose the original stake.
• Reverse: Two if-bets running simultaneously in both directions (1→2 and 2→1). Total risk is 2× the stake but you have two chances to chain a win.

• Enter American odds for each leg and your stake per leg
• Set your estimated win probability per leg to see Expected Value for each bet type
• The scenario table shows every outcome with exact P&L so you know your worst and best cases before betting

Futures Payout Calculator

What it does: Instantly calculates profit and total return for a futures bet (e.g. championship winner, award winner) and optionally shows whether the bet has positive expected value.

• Enter your stake and the American odds (e.g. +800 for an 8-to-1 shot) to see exact profit and return
• Enter your true win probability if you have an estimate — you'll see your edge and expected value vs. the book's implied odds
• The payout table at the bottom shows profit at common stake sizes ($5 → $1,000) at the same odds so you can quickly size your bet

Futures carry more risk since your money is tied up for the entire season. A positive EV doesn't always mean it's worth the capital lockup.

Kelly Criterion

What it does: Calculates the mathematically optimal percentage of your bankroll to bet given your edge, so you grow your bankroll as fast as possible without overbetting and going broke.

• Enter the odds, your estimated fair win probability, and your bankroll
• If Kelly is negative or zero, the bet has no edge — don't bet
• Full Kelly is mathematically optimal but volatile — most pros use Half Kelly (50%) or Quarter Kelly (25%) to reduce variance
• Quarter Kelly is the recommended starting point: it accounts for estimation error in your edge while preserving most long-run growth
• The table shows all fraction levels side-by-side so you can pick your risk tolerance

Multi-leg Kelly (below) estimates the optimal stake for a parlay by combining each leg's Kelly signal. Add legs with their odds and your estimated win % per leg.