Sports
Betting Odds Explained: Decimal and Probability
Quick Summary
- Decimal odds multiply your stake: stake times odds equals total return.
- Implied probability is 1 divided by the decimal odds.
- The bookmaker margin makes implied probabilities add up to more than 100 per cent.
- All examples are hypothetical and not tied to any real match.
Odds tell you two things at once: what a winning bet pays and how likely the bookmaker thinks the outcome is. Once you can read them, every sportsbook screen becomes easier. This guide uses decimal odds, the format most commonly shown, with made-up examples in Taka. It also shows how to find the margin hidden in a market.
Reading decimal odds
Decimal odds show your total return per 1 staked, including your stake. Multiply stake by odds. At 2.50, a ৳400 stake returns ৳1,000, which is ৳600 profit. At 1.50, the same ৳400 returns ৳600, a profit of ৳200.
Lower odds mean the outcome is rated more likely; higher odds mean less likely. A price of 1.01 is nearly certain by the book's view and 51.00 is a long shot.
| Decimal odds | Stake | Total return | Profit |
|---|---|---|---|
| 1.50 | ৳400 | ৳600 | ৳200 |
| 2.00 | ৳400 | ৳800 | ৳400 |
| 2.50 | ৳400 | ৳1,000 | ৳600 |
| 5.00 | ৳400 | ৳2,000 | ৳1,600 |
Implied probability
Divide 1 by the decimal odds to find the implied chance. At 2.00 it is 50 per cent; at 4.00, 25 per cent; at 1.25, 80 per cent. This tells you what the price claims about the outcome, before margin.
Use it as a sanity check. If your own view of an outcome is much lower than the implied figure, the price is poor value for you; if it is higher, the price may be fair or good. It is a way to think, not a way to win.
Other formats: fractional and American
Fractional odds such as 6/4 show profit relative to stake: you win 6 for every 4 staked. Convert to decimal by dividing and adding 1, so 6/4 becomes 2.50. American odds use plus and minus: +150 means 150 profit on 100 staked, equal to 2.50 decimal; -200 means you stake 200 to win 100, equal to 1.50.
Sportsbooks often let you switch format in settings. Pick one and stay with it to avoid mistakes.
- Fractional 6/4 equals decimal 2.50.
- American +150 equals decimal 2.50.
- American -200 equals decimal 1.50.
The margin hidden in every market
Add up the implied probabilities of every outcome in a market. If it comes to more than 100 per cent, the extra is the bookmaker's margin. For a two-way market priced 1.90 and 1.90, each side implies about 52.6 per cent, totalling about 105.3 per cent. That 5.3 gap is the built-in cost of betting.
Markets with more outcomes, such as outright winners and correct score, usually carry larger margins. Our house edge article shows how this idea applies across casino and sports.
Applying odds on 7J777
BTi is the sportsbook provider we saw in the 7J777 lobby on 5 November 2026. Which sports, leagues and markets appear changes with the calendar, so treat the live sportsbook as the source of truth and check each event's market list.
Look at the same event in different markets and compare how prices are built. Accumulators multiply odds, but also multiply margin, which is covered in our accumulator bets guide. For cricket specifics, see cricket odds, and for football formats see football betting.
Three steps
How to check a price in 3 steps
- 1Calculate the return
Multiply your stake by the decimal odds and subtract the stake to see profit.
- 2Convert to probability
Divide 1 by the odds and ask if the percentage looks right to you.
- 3Check the margin
Add the implied probabilities for every outcome in the market to see the built-in cost.
Keep reading
Providers in the lobby
- JILI
- PG Soft
- JDB
- Pragmatic Play
- Spribe
- Spadegaming
- AE Sexy
- BTi
Seen in the 7J777 lobby on 5 November 2026. Line-ups change; check the lobby.
Ready when you are
Open 7J777 in a new tab, set a budget first, and keep this guide handy for the cashier steps.
18+ only. Real-money play carries risk. Buttons open 7J777 in a new tab.
Frequently Asked Questions
What do decimal odds of 2.00 mean?
A winning bet returns twice your stake, including the stake, so profit equals the stake. The price implies a 50 per cent chance before the margin. A ৳500 stake returns ৳1,000.
Are higher odds better?
Higher odds pay more but imply a lower chance. A big price is only good value if the real chance is higher than the implied probability. Otherwise it is simply a rarer win.
What is the bookmaker margin?
It is the gap between the implied probabilities of all outcomes and 100 per cent. It is how a sportsbook earns whatever the result. Lower margin markets cost you less over time.
Which odds format does 7J777 use?
BTi is the sportsbook provider seen in the lobby on 5 November 2026. Many sportsbooks let you switch between decimal, fractional and American formats, so check the settings in the sportsbook.