Science & Engineering

Implied Probability from Betting Odds

Convert betting odds to implied probability in seconds. It accepts decimal, American, and fractional formats, and adding the other side strips the vig to show fair odds.

For study and estimation. Verify against authoritative data before relying on a result.

Was this helpful?

Common values

American odds	Decimal	Implied probability
-200	1.50	66.7%
-110	1.909	52.4%
+100	2.00	50.0%
+200	3.00	33.3%

Common questions

How do you convert American odds to implied probability?

For negative odds, divide the odds by the odds plus 100. For positive odds, divide 100 by the odds plus 100. So -200 implies 66.7%.

What is the vig in betting odds?

The vig is the bookmaker's margin baked into the odds, which makes the two sides' implied probabilities add up to more than 100%.

From the blog

Guides & how-tos

All articles →

Fitness & Health Is 10,000 Steps a Day Actually the Right Goal?

The 10,000-steps target started as a 1965 Japanese marketing slogan. The mortality research says benefits plateau around 7,000-8,000 steps a day, and even less for older adults. Here's the evidence and a realistic goal.

Jul 28, 2026 · 7 min read

Finance $30 an Hour Is How Much a Year? (Full-Time Breakdown)

$30 an hour comes to $62,400 a year at full time, or about $5,200 a month. Here's the full breakdown by pay period, what's left after 2026 taxes, and how part-time hours and unpaid time off change the number.

Jul 25, 2026 · 6 min read

Dates & Time The Schengen 90/180 Rule, Explained: How the Rolling Window Works

You get 90 days in any 180-day period across the Schengen Area, but the 180 days are a rolling window that moves with you, not a fixed reset. Here's how it really works and how to count your days.

Jul 21, 2026 · 8 min read