Odds Converter

Understanding odds formats

Odds are just three different ways of writing the same thing: how much a bet pays, and how likely the bookmaker thinks the outcome is. Crypto sportsbooks and casinos use all three formats, so it helps to read each fluently.

Decimal odds

The most common format in crypto and across Europe. Decimal odds show your total return per unit staked, including your stake. Odds of 2.50 mean a 1-unit bet returns 2.50 (a 1.50 profit). To find your return, simply multiply your stake by the decimal number. They are the easiest format to compare at a glance, which is why most crypto books default to them.

Fractional odds

Traditional in the UK and Ireland. Fractional odds like 3/2 show profit relative to stake: a 2-unit bet wins 3 (plus your 2 back). “Evens” is 1/1. They map cleanly to decimals — 3/2 is 2.50 in decimal — but are harder to compare quickly once the numbers get awkward.

American (moneyline) odds

Standard in the United States. A positive number (+150) shows the profit on a 100-unit stake; a negative number (-200) shows how much you must stake to win 100. Favourites are negative, underdogs positive. The tool above converts any American price to decimal and fractional so you never have to do the mental arithmetic.

Implied probability — the number that actually matters

Every price carries an implied probability: the chance the odds are pricing in. For decimal odds it is simply 1 ÷ decimal. Odds of 2.50 imply a 40% chance (1 ÷ 2.50). This is the single most useful thing to pull out of any price, because it lets you compare the bookmaker’s view with your own.

The margin (overround) — the built-in edge

Add up the implied probabilities of every outcome in a market and you will get more than 100%. That extra slice is the bookmaker’s margin, or overround — the equivalent of the house edge in casino games. On a two-way market priced at 1.90 / 1.90, each side implies 52.6%, summing to 105.2%; that 5.2% is the book’s edge. A tighter margin (closer to 100%) is better value for you; a fatter one is worse. Converting odds does not change this — it just helps you see it.

What this tool is (and isn’t)

This converter is an informational aid, not a betting system. Translating a price into a cleaner format or reading its implied probability does not make a bet profitable, and no format is “better value” than another — they describe identical payouts. Over enough bets, the margin means the expected result of wagering is a loss. Use the numbers to understand what you are being offered and to spot which book prices a market more tightly, not as a promise of returns. You must be 18 or older, and if betting stops being fun, free and confidential help is on our Ответственная игра hub.