HesapHanem

Fractional to Decimal Odds Converter

Decimal odds and implied probability for UK-style fractional odds.

Result

3.75
26.67%

How it is calculated

Fractional odds written as a/b, such as 11/4, state the profit (a) for a stake of b. The tool adds the returned stake to get the total payout per unit staked: decimal = a ÷ b + 1. It also gives the implied probability, which is the chance the price suggests, implied probability = 1 ÷ decimal × 100. Decimal odds are shown with two decimals and the probability as a percentage with two decimals. The numerator can be zero (odds of 0/1 give 1.00), but the denominator must be above zero, and negative numbers return no result. The implied probability is the bookmaker's price turned into a percentage, not a forecast, and it includes the bookmaker's margin.

Worked example

Convert odds of 11/4. Divide the numerator by the denominator: 11 ÷ 4 = 2.75. Add 1 for the returned stake: 2.75 + 1 = 3.75. A stake of 4 would return 15 in total (11 profit plus the 4 stake), and 15 ÷ 4 = 3.75 confirms it. Implied probability: 1 ÷ 3.75 = 0.2667, or 26.67%. As another reading of the same price, 1/2 converts to 1.50 and an implied 66.67%.

Try this example →

Common mistakes

  • Forgetting to add 1. Fractional odds show profit only, so 5/1 is 6.00 in decimal, not 5.00.
  • Entering the odds the wrong way round. 2/5 and 5/2 are very different prices: 2/5 is 1.40 and 5/2 is 3.50.
  • Treating the implied probability as the true chance of winning. It reflects the price and includes the bookmaker's margin, so the implied percentages of all outcomes in one event add up to more than 100%.
  • Entering a decimal price in the numerator field. Odds such as 3.75 are already decimal; this tool converts only fractional odds.
  • Entering 0 as the denominator. The tool needs a denominator above zero, and no result is shown otherwise.

About this calculator

Fractional odds (common in the UK, e.g. 5/1) show the profit relative to the stake: a 5/1 bet returns £5 profit for every £1 wagered, plus the stake back. Decimal odds (standard across most of Europe, Australia and betting exchanges) express the total payout per unit staked, calculated as decimal = (numerator / denominator) + 1 — so 5/1 becomes 6.00, meaning a €1 stake returns €6 in total.

Sports bettors and oddsmakers use this conversion to compare prices across bookmakers that quote in different formats, since decimal odds make it straightforward to calculate total payout and implied probability directly. This is a neutral price-format conversion used throughout the betting and bookmaking industry, not a prediction or recommendation of any kind.

Was this helpful?

You can pick up to 3 reactions.

Comments (1)

  • Editorial team

    Odds-on prices, where the numerator is smaller than the denominator, convert to a decimal below 2, so 1/3 becomes 1.33 and you risk more than you can win. Evens, 1/1, is 2.00. The tool converts one win price only: each-way terms and deductions for withdrawn runners are not included. Are there fractional prices you see written in a style the page does not read properly? Post them.

Popular calculators

Loan Calculator

Monthly payment, total interest and full amortization schedule.

Percentage Calculator

Percent change, percent of, and ratio calculations.

Discount Calculator

Calculate final price, savings, and discount amount.

BMI Calculator

Body mass index from height and weight (metric or imperial).

Age Calculator

Compute your exact age in years, months and days from a birth date.

Compound Interest Calculator

Calculate the final amount and interest earned with compounding.

All Calculators