What are decimal odds?

Decimal odds (used in Europe, including Finland) represent the total return per unit staked, including your stake. Odds of 2.50 means you get €2.50 back for every €1 bet, a profit of €1.50. Multiply your stake by the decimal odds to get total return.

How do I convert decimal odds to implied probability?

Divide 1 by the decimal odds to get the implied probability. For example, odds of 2.50 imply a probability of 1/2.50 = 40%. If you think the true probability is higher, the bet has positive expected value.

What is the vig or bookmaker margin?

The vig (vigorish) or margin is the bookmaker's built-in profit. It means the implied probabilities of all outcomes sum to more than 100%. Typical Finnish bookmakers have a margin of 5–8% for sports betting.

Betting Calculator

Calculate potential winnings from sports bets. Enter your stake and odds to see profit and total return for single bets.

Stake: 50 €

Decimal odds: 2,10(impl. prob. 47,6 %)

55,00 €

Profit

105,00 €

Total payout

47,6 %

Impl. probability

Stake comparison at odds 2,10

Stake	Profit	Total
10 €	+11,00 €	21,00 €
25 €	+27,50 €	52,50 €
50 €	+55,00 €	105,00 €
100 €	+110,00 €	210,00 €
200 €	+220,00 €	420,00 €
500 €	+550,00 €	1 050,00 €

⚠️ Gamble responsibly. Betting is gambling. Problems? peluuri.fi (Finnish helpline) or tel. 0800 100 101 (free).

The Betting Calculator brings the key tools for bettors together: working out winnings, converting odds, checking the bookmaker margin, and spotting value bets. It shows at a glance how much a bet returns and whether the odds are favourable.

How the calculator works and what it’s for▾

How the calculator works

Winnings are found by multiplying your stake by the odds, giving the total return and the net profit separately. The odds converter translates between formats such as decimal and fractional odds.

The margin reflects the cut a bookmaker builds in, while the value-bet check compares your own probability estimate against the odds offered.

What you enter and what you get

You typically enter a stake and the odds to get the profit and total return. For conversion, you provide the odds in one format and receive them in the others.

To calculate the margin, you enter all the odds for an event and see how large a share the bookmaker keeps.

Who it is for

The calculator suits both casual punters and seasoned bettors who want to understand odds and compare markets sensibly.

It is handy when you want to check a payout before betting or judge whether the odds are truly good value.

Tips for interpreting results

A lower margin means better odds for the player, so it pays to compare bookmakers. A value bet only exists when your own probability estimate is higher than the odds imply.

Remember the calculator shows the maths, but the outcome still depends on chance and on how accurate your estimate is.

🔄 Reviewed June 2026