Odds Converter

Type a price in any format and the other three update. The implied probability is what the price really says about the outcome, bookmaker margin included.

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A 100 unit stake returns 191.00 units, stake included.

Three formats, one price

Decimal odds state the total return per unit staked: 2.50 returns 2.50 for every 1 risked, 1.50 of it profit. Fractional odds quote only the profit: 6/4 means 6 units won for 4 staked, the same 2.50. American odds anchor on 100: a positive number such as +150 is the profit on a 100 stake, a negative number such as -200 is the stake needed to win 100.

The formulas

  • Decimal = fractional + 1
  • Decimal = 1 + american / 100 when the moneyline is positive, 1 + 100 / abs(american) when it is negative
  • Implied probability = 1 / decimal

Why implied probability is the number to watch

The implied probability is the chance the bookmaker is charging you for. It includes the margin, so across a whole market the implied probabilities add up to more than 100%: the excess is the vig, and the no-vig calculator strips it out to reveal the fair price. Comparing your own estimate of the probability with the implied one is the whole game; the Kelly calculator turns that gap into a stake.

In the Strategy Builder

Odds are stored as decimals and shown in the format you choose in your settings. Odds range and implied probability filters let you backtest a price band across years of Pinnacle prices rather than converting one line at a time.

Other calculators

No-Vig Calculator Remove the bookmaker margin and get fair odds and true probabilities.Kelly Criterion Calculator Size a stake from the odds, your win probability and your bankroll.Closing Line Value Calculator Measure how much the price you took beat the closing price.

Keep exploring

Closing Line Value (CLV): The Metric That Predicts Profit What closing line value (CLV) is, why beating the Pinnacle close predicts long-term profit, and how to measure and hunt it with market filters.Backtest a Betting Strategy on 10 Years of Pinnacle Odds Learn how to backtest a betting strategy properly: avoid overfitting, respect sample size, settle at real prices, and test free on Pinnacle closing odds.

Frequently asked questions

Why do American odds jump from -100 to +100?

Both mean even money, decimal 2.00. Moneylines never sit between -100 and +100: favourites are negative (the stake to win 100), underdogs are positive (the profit on 100).

Why is my fraction shown differently from the bookmaker?

The converter picks the closest fraction with a denominator up to 20. Bookmakers round to traditional fractions such as 10/11 or 6/4, which can differ by a fraction of a per cent from the decimal price.

Does the implied probability equal the real probability?

No. It includes the bookmaker margin, so it overstates the real chance. Remove the vig across all outcomes of the market to get a fair estimate, or compare it with a sharp closing price.

Backtest your own strategy

Free to start, years of real Pinnacle odds, no card required.