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Betting Calculators — Parlay, Odds, Hedge, Hold & Value

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Overview

Free betting calculators: parlay payout, odds converter, hedge, market hold and value/EV. No data collected, works offline.

Betting Calculators is a free, lightweight toolkit for sports bettors. Open the popup and instantly run the five most useful betting calculations — no sign-up, no tracking, and it works completely offline. INCLUDED TOOLS: - Parlay / Accumulator — combine multiple selections and see your combined odds, total payout, profit and implied probability. Add as many legs as you like. - Odds Converter — convert between Decimal, American (+150 / -200) and Fractional (3/2) odds, with implied probability. - Hedge Calculator — work out the exact stake to place on the opposite side to lock in a guaranteed result, with ROI. - Market Hold — calculate the bookmaker's built-in margin (overround) across all outcomes of a market. Lower hold means better value. - Value / Expected Value — enter your own estimated win probability and check whether a price is a value bet, including edge % and fair odds. PRIVACY: This extension does NOT collect any data. There are no permissions, no cookies, no analytics, and no remote servers. Every calculation runs locally in your browser. This free tool is provided by CorrectBetting. For the full set of online calculators and more betting tools, visit correctbetting.com.

Details

  • Version
    1.0.0
  • Updated
    May 26, 2026
  • Offered by
    Cameron Wells
  • Size
    13.89KiB
  • Languages
    English
  • Developer
    Email
    sayravesayra@outlook.com
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

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The developer has disclosed that it will not collect or use your data. To learn more, see the developer’s privacy policy.

This developer declares that your data is

  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes

Support

For help with questions, suggestions, or problems, visit the developer's support site

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