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Betting Odds Calculator

Enter your stake and odds in American, Decimal, or Fractional format. Get implied probability, profit, and payout. Supports Single bets and Multis/Parlays.

American Odds
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Decimal Odds
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Fractional Odds
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Implied Probability
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Profit
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Payout
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The betting odds calculator lets you convert odds (decimal, fractional, American), work out multi odds for head-to-head bets, and see payout and implied probability for both singles and multis. It’s the fastest way to sanity-check prices and build smarter slips.

What is a Betting Odds Calculator?

An odds calculator is a simple tool for translating betting odds between formats, estimating payout and implied probability, and combining legs into a multi (parlay). Use it for head-to-head markets across NRL, AFL, NBA, UFC and more.

What the Calculator Does

  • Convert odds instantly between decimal, fractional, and American.
  • Build multis (parlays): add head-to-head legs and get the combined multi odds.
  • Singles & multis: enter a stake to see total payout and profit.
  • Implied probability: view the chance each price represents.

How to Use the Betting Calculator

  1. Choose Single or Multi: pick a single head-to-head or add multiple legs for a multi.
  2. Enter Odds in Any Format: type decimal, fractional, or American—everything auto-converts.
  3. Add Your Stake: see payout, profit, and implied probability.
  4. Refine: add/remove legs to adjust your multi odds before you place a bet.

Odds Conversion at a Glance

  • Decimal → Implied %: 1 / decimal
  • Fractional (a/b) → Decimal: 1 + a/b
  • American (+A) → Decimal: 1 + (A / 100) (e.g., +150 → 2.50)
  • American (−A) → Decimal: 1 + (100 / A) (e.g., −200 → 1.50)
  • Decimal ≥ 2.00 → American: (decimal − 1) × 100 (2.40 → +140)
  • Decimal < 2.00 → American: −100 / (decimal − 1) (1.80 → −125)

Example: Single vs Multi (Head-to-Head)

Single: Decimal 2.10 → implied probability = 1 / 2.10 = 47.62%.

Two-Leg Multi: Legs at 1.80 and 2.00 → multi odds = 1.80 × 2.00 = 3.60. A $50 stake would return $50 × 3.60 = $180 (profit $130).

Why Convert Odds?

Different books and regions display betting odds differently. A flexible betting calculator makes apples-to-apples comparisons easy, so you can spot underpriced head-to-head lines and build better multis.

Tips for Better Multi Odds

  • Combine independent legs; correlated legs can distort price.
  • Compare across multiple bookmakers before locking in a multi.
  • Track implied probabilities to avoid over-stacking long shots.

Limitations

An odds calculator converts and combines prices; it doesn’t guarantee outcomes. Prices move, markets differ by book, and payout terms can vary. Always check final odds before placing a wager.

Why WagerWise?

Our free odds calculator is just the start. WagerWise also offers live screens for shopping betting odds, bankroll tools, and a Learning Zone to sharpen your edge. Ready to upgrade your process? Compare odds live with WagerWise.