Odds Converter: Convert American, Decimal, Fractional, and Implied Probability (Calculate on Click)

What the Converter Does

• Converts between:
  • American odds (e.g., -130, +160)
  • Decimal odds (e.g., 1.83)
  • Fractional odds (e.g., 5/2, 11/10)
  • Implied Probability (percentage)
• Works from any single valid input and fills the other three formats.
• Disables browser autocomplete/autocorrect on fields.
• Clipboard copy of the results.

Quick Start (User Guide)

1. Enter any one format

• American: type a signed integer (e.g., -120 or +150).
• Decimal: enter a number greater than 1 (e.g., 1.91).
• Fractional: enter numerator/denominator (e.g., 5/2).
• Implied Probability: enter a percentage value (e.g., 54.3).

2. Press Calculate

• The tool will detect your valid input (priority: American → Decimal → Fractional → Probability), convert internally to decimal, then populate all four formats.

3. Review and Copy

• Results appear in the panel below.
• Click Copy results to place the four values into your clipboard for quick sharing or note-taking.

4. Clear if Needed

• Click Clear to reset fields and results.

Input Rules and Tips

• American odds: no decimals; use a leading minus for favorites (e.g., -130) and plus for underdogs (e.g., +160).
• Decimal odds: must be greater than 1.00; includes stake in total return.
• Fractional odds: numerator/denominator, both positive integers; we reduce to simplest terms.
• Implied Probability: 0.01% to 99.99% (exclusive of 0% and 100%).
• Paste-friendly: You can paste a value into any single field, then press Calculate.

How Conversions Work (Reference)

• From American to Decimal:
  • If positive: decimal = 1 + A/100
  • If negative: decimal = 1 + 100/|A|
• Implied Probability from Decimal: p = 1/decimal
• Fractional from Decimal: fractional = decimal − 1, then reduce to simplest terms (n/d)
• American from Decimal:
  • If decimal ≥ 2.0: American = +((decimal − 1) × 100)
  • If decimal < 2.0: American = −(100 / (decimal − 1))
• Notes:
  • Rounding is conservative (2–4 decimals for decimal odds; probability shows 1–3 decimal places depending on magnitude).
  • Conversions assume no bookmaker margin (no vig).

Troubleshooting

• Nothing happens when I click Calculate:
  • Make sure at least one field has a valid entry. If not, the status chip will say “Please enter a valid value in any one field.”
• Browser auto-suggest still appears:
  • We disable autocomplete, autocapitalize, autocorrect, and spellcheck. If a password manager is injecting suggestions, try disabling it for this page or use your browser’s private mode.
• My fractional odds look different than what I typed:
  • The tool reduces fractions to simplest terms (e.g., 10/4 becomes 5/2).
• Rounding differs from my book:
  • Books may round differently or include vig; our tool presents fair—vigless—conversions with standard rounding.

Example Walkthroughs

• American to others:
  • Input: -120 → Calculate
  • Output:
    • American: -120
    • Decimal: 1.83
    • Fractional: 5/6
    • Implied Probability: 54.55%
• Decimal to others:
  • Input: 2.40 → Calculate
  • Output:
    • American: +140
    • Decimal: 2.40
    • Fractional: 7/5
    • Implied Probability: 41.67%

FAQ

• Can I type in multiple fields? Yes, but only the first valid field in the priority order (American → Decimal → Fractional → Probability) is used for calculation.
• Does it support plus/minus tax or vig? No. This tool assumes fair odds conversions without bookmaker margin.
• What about massive odds (e.g., +50000)? Inputs are sanity-checked to prevent extreme values from causing errors.

Changelog

• 2025-08: First release (calculate-on-click, theme-safe wrapper, autofill suppressed).

Call to Action
Try the Odds Converter now in Tools and Calculators. If you have feedback or want additional betting tools, drop a comment below or contact us on the Best for Guide contact page.