Odds to Probability Text Changer

Click this extension to convert all American odds on a webpage to implied probability.

Users119

Rating5.0

Reviews1

Manifest versionV3

7-day growth-9

7-day growth rate-7.03%

Preview

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1 assets

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30-day rating change

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5.00

Latest

5.00

30-day rating change

0.00

2026年5月31日2026年6月6日

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1-day growthDeclining

-3-2.46%

7-day growthDeclining

-9-7.03%

30-day growthDeclining

-12-9.16%

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Version3.3

ManifestV3

Size73.53KiB

Languages1English

Published--

Store updated--

Last crawled--

Overview

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This extension looks for American odds (such as "+140" or "-350") on the page, calculates the implied probability, and displays it as a percentage. For example, "+140" becomes "+140 (41.7%)"

Assuming the odds are "fair", the implied probability is the percentage chance that the bet is supposed to win.

Because sportsbooks charge a fee or "vig" for placing bets, this number will appear slightly higher than the actual probability.

This implied probability is simpler way to look at sports betting: a "good bet" is one where you believe the percentage chance is higher than the implied probability.

This project is open-source and available on Github: https://github.com/danielchines/odds-converter-extension

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