US Odds to Fractional Odds Calculator

Enter American odds, stake, and chosen precision. Get simplified fractional odds, probability, profit, and payout. Download CSV or PDF records for betting analysis today.

Advanced Calculator

Formula Used

For positive American odds: Fractional odds = American odds / 100.

For negative American odds: Fractional odds = 100 / absolute American odds.

Simplification: Divide numerator and denominator by their greatest common divisor.

Decimal odds: Decimal odds = 1 + fractional value.

Implied probability: Implied probability = 100 / decimal odds.

Profit: Profit = stake × fractional value.

Total payout: Total payout = stake + profit.

How to Use This Calculator

  1. Enter the American odds with a plus or minus sign.
  2. Add your stake amount for profit and payout estimates.
  3. Select the decimal precision you want for rounded results.
  4. Choose exact simplification or limit the denominator.
  5. Press Calculate to view the result below the header.
  6. Use CSV or PDF buttons to save the same calculation.

Example Data Table

American Odds Formula Fractional Odds Decimal Odds Implied Probability
+150 150 / 100 3/2 2.50 40.00%
-200 100 / 200 1/2 1.50 66.67%
+100 100 / 100 1/1 2.00 50.00%
-125 100 / 125 4/5 1.80 55.56%

Understanding US Odds Conversion

US odds are popular in American betting markets. They show how much profit connects with a one hundred unit base. Positive odds show profit on a one hundred unit stake. Negative odds show the stake needed to win one hundred units. Fractional odds express the same idea as a ratio. They show potential profit first, then the stake needed.

Why Fractional Odds Matter

Fractional odds are useful when comparing prices across books or records. They make the profit relationship clear. A fraction of 3/2 means three units profit for every two units staked. This format also helps when checking implied probability. A smaller fraction usually means a stronger favorite. A larger fraction usually means a bigger underdog.

How This Tool Helps

This calculator converts American odds into fractional odds instantly. It also simplifies the fraction, calculates decimal odds, and estimates implied probability. The stake field adds practical profit and payout values. These outputs help readers understand the result before saving it. The precision option controls rounded figures. The export buttons create useful records for reports, notes, or comparison sheets.

Reading the Results

The fractional odds result is the main conversion. Decimal odds include the returned stake. Profit shows the amount won before the original stake returns. Total payout combines stake and profit. Implied probability shows the break even chance before any margin or commission. It is not a prediction. It only translates the offered price into percentage form.

Best Practices

Always enter the signed American price carefully. Use plus signs for underdogs and minus signs for favorites. Avoid mixing stake values with odds values. Review the simplified fraction when sharing results. Use the CSV file for spreadsheets. Use the PDF file for printable notes. Compare several prices before deciding anything. Odds can change quickly. Keep records consistent by using the same stake and precision across every comparison. Small rounding differences can change displayed percentages. Exact fractions are best for explanation. Rounded decimals are easier for quick review. Both views support clearer decisions when prices are checked side by side over time safely. This page is an educational conversion aid. It does not guarantee profit, value, or success. Responsible bankroll planning remains important for every user.

FAQs

What are US odds?

US odds, also called American odds, show profit against a one hundred unit base. Positive odds show profit from one hundred staked. Negative odds show the stake needed to win one hundred.

How do I convert positive US odds?

Divide the positive number by 100. For example, +150 becomes 150/100. Simplify it by dividing both sides by 50. The final fractional odds are 3/2.

How do I convert negative US odds?

Use 100 as the numerator. Use the absolute odds value as the denominator. For example, -200 becomes 100/200. Simplify it to 1/2.

What does fractional odds mean?

Fractional odds show profit compared with stake. A result of 5/2 means five units of possible profit for every two units staked.

Does the calculator show implied probability?

Yes. It converts the odds to decimal form first. Then it divides 100 by decimal odds. This gives the break even probability before margins.

Can I download the result?

Yes. Use the CSV button for spreadsheet records. Use the PDF button for printable records. Both exports use the current form values.

Why use exact fraction mode?

Exact mode gives the mathematically simplified result. It is best when you want a precise conversion without limiting the denominator.

Is this a betting advice tool?

No. This page only converts odds and estimates payout values. It does not predict results, guarantee value, or provide financial advice.

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