Odds auto-convert across all formats.
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
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.
- 1. Convert odds instantly between decimal, fractional, and American.
- 2. Build multis (parlays): add head-to-head legs and get the combined multi odds.
- 3.Singles & multis: enter a stake to see total payout and profit.
- 4.strong>Implied probability: view the chance each price represents.
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Choose Single or Multi:
Pick a single head-to-head or add multiple legs for a multi.
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Enter Odds in Any Format:
Type decimal, fractional, or American—everything auto-converts.
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Add Your Stake:
See payout, profit, and implied probability.
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Refine:
Add/remove legs to adjust your multi odds before you place a bet.
- 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)
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).s into a multi (parlay).
Use it for head-to-head markets across NRL, AFL, NBA, UFC and more.
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.
- 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.
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.
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.