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Free Tool Algorithm updated: Feb 2026

Professional Odds Converter 2026

Convert between decimal, fractional, American odds and probability instantly

EV
Developed by Evgeniy Volkov

Enter Your Odds

Conversion Results

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Enter odds above to see instant conversion

Conversion Formulas

The mathematics behind odds conversion

Decimal → Probability

P = (1 ÷ D) × 100

2.50 → (1 ÷ 2.50) × 100 = 40%

Probability → Decimal

D = 100 ÷ P

40% → 100 ÷ 40 = 2.50

Decimal → American

D ≥ 2: (D-1) × 100 D < 2: -100 ÷ (D-1)

2.50 → (2.50 - 1) × 100 = +150

Decimal → Fractional

F = (D - 1) / 1

2.50 → (2.50 - 1) / 1 = 3/2

Understanding Odds Formats

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Decimal Odds

Total return per $1 bet. Odds of 2.50 means $2.50 return ($1.50 profit). Popular in Europe, Australia, and Canada.

2.50 = $2.50 return on $1 bet
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Fractional Odds

Profit vs stake ratio. 3/2 means $3 profit for every $2 wagered. Traditional format used in UK and Ireland.

3/2 = $3 profit per $2 stake
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American Odds

Shows profit on $100 (+odds) or stake needed to win $100 (-odds). Used primarily in the United States.

+150 = $150 profit on $100 bet
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Implied Probability

The chance of winning according to the odds. Includes bookmaker margin, so actual probability may differ.

40% = 4 in 10 chance

Odds Comparison Table

Common odds across all formats

DecimalFractionalAmericanProbability
1.501/2-20066.7%
2.001/1+10050.0%
2.503/2+15040.0%
3.002/1+20033.3%
5.004/1+40020.0%
10.009/1+90010.0%

Pro Tips

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Shop for Best Odds

Different bookmakers offer different odds. Comparing across 3-4 sites can significantly increase long-term profits.

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Understand Margin

Lower margin means better value. Asian bookmakers like Pinnacle typically offer 2-3% margin vs 5-6% at traditional bookies.

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Use Decimal Format

Decimal odds are easiest for calculations and comparisons. Most professional bettors prefer this format.

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FAQ

Frequently Asked Questions

Decimal odds show your total return for every $1 bet. For example, odds of 2.50 mean you get $2.50 back for every $1 bet (including your stake). Popular in Europe, Australia, and Canada.
American odds show how much you need to bet to win $100 (negative odds like -150) or how much you win from a $100 bet (positive odds like +150). Used primarily in the United States.
Fractional odds like 3/1 show your profit relative to your stake. 3/1 means you win $3 for every $1 bet. Traditional format used in UK and Ireland.
Implied probability is the chance of an outcome happening according to the odds. Lower odds = higher probability. It includes the bookmaker margin, so actual probability may be different.
For decimal to probability: divide 1 by decimal odds and multiply by 100. For decimal to American: if odds ≥ 2, multiply (odds - 1) by 100. If odds < 2, divide -100 by (odds - 1).
Bookmaker margin (also called vig, juice, or overround) is the built-in profit for the bookmaker. If you add up implied probabilities and get more than 100%, the difference is the margin.
Bookmakers set odds based on their own analysis, risk exposure, and desired margin. Sharp bettors compare odds across bookmakers to find the best value.

About Our Odds Converter

Our professional odds converter instantly transforms betting odds between decimal, fractional, American, and implied probability formats. Whether you're betting on European sportsbooks with decimal odds or UK bookmakers with fractional odds, this free tool helps you understand exactly what odds mean.

The Pro mode includes a margin calculator that analyzes bookmaker overround. Enter odds for all outcomes to see the total implied probability and bookmaker edge. Compare fair odds to actual odds to find value betting opportunities.

This calculator is 100% free, works instantly as you type, and requires no registration. Updated for 2026 with the latest odds formats used by major bookmakers worldwide.

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Evgeniy Volkov

Evgeny Volkov

Verified Expert
Math & Software Engineer, iGaming Expert

Over 10 years developing software for the gaming industry. Advanced degree in Mathematics. Specializing in probability analysis, RNG algorithms, and mathematical gambling models.

Experience10+
SpecializationiGaming
Status
Active
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