Betting odds explained in one line: odds tell you how much a winning bet pays and how likely the sportsbook thinks an outcome is. The same price can be written in six different formats, from the decimal odds most Philippine sportsbooks use to the American odds common in NBA coverage and the Asian formats some sportsbooks offer.
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This guide covers every format, how to convert between them, how to calculate payouts, and how to read the probability and the bookmaker’s margin built into every line. If you’re new to betting, start with our beginner’s guide to sports betting in the Philippines. All odds and amounts below are worked examples, not real lines.
What do betting odds tell you?
Every set of odds carries two pieces of information. The first is the payout: how much you get back if your bet wins. The second is the implied probability: how likely the sportsbook rates the outcome, after its margin is added.
Lower odds mean a more likely outcome and a smaller payout, while higher odds mean a less likely outcome and a bigger payout. Every format below expresses the same two things in a different way, so a price that looks different in another format is still the same bet.
Decimal odds
Decimal odds are the standard format at most sportsbooks in the Philippines, and the easiest to calculate. The number shows your total return for every ₱1 staked, including the stake itself.
Total return = stake × decimal odds. Profit = total return − stake.
Example
A ₱500 bet at 2.50 returns ₱1,250 if it wins: your ₱500 stake plus ₱750 profit.
Decimal odds are always above 1.00. Odds of 2.00 are even money, where the profit equals the stake. Anything below 2.00 pays less than your stake in profit, and anything above 2.00 pays more.
Fractional odds
Fractional odds, common in the UK and in horse racing, show the profit relative to the stake. Odds of 3/2 mean you win ₱3 in profit for every ₱2 you stake, and your stake is returned on top.
Profit = stake × (top number ÷ bottom number). Total return = profit + stake.
Example
A ₱200 bet at 3/2 wins ₱300 profit (₱200 × 3 ÷ 2) and returns ₱500 in total.
When the first number is smaller than the second, such as 1/2, the outcome is “odds-on”: you win less than you stake. When the first number is bigger, such as 3/1, it’s “odds-against.” Odds of 1/1 are called evens.
American odds
American odds, also called moneyline odds, are used by US sportsbooks and appear often in NBA and NFL coverage. They use a plus or minus sign, and each sign works differently.
Negative American odds
A minus sign shows how much you must stake to win ₱100 in profit, and it marks the favorite. Odds of −200 mean a ₱200 bet wins ₱100 profit, for a total return of ₱300.
Positive American odds
A plus sign shows how much profit a ₱100 stake wins, and it marks the underdog. Odds of +150 mean a ₱100 bet wins ₱150 profit, for a total return of ₱250. Our basketball betting guide shows American odds in NBA spread and moneyline examples.
Example
−110, one of the most common prices on a spread, means a ₱110 bet wins ₱100 profit. In decimal odds, that’s about 1.91.
Asian odds formats: Hong Kong, Malay and Indonesian
Some sportsbooks in the Philippines let you switch your odds display to one of three Asian formats. They are popular across Asia, especially for handicap and over/under markets, and each shows profit rather than total return.
Hong Kong odds
Hong Kong odds show the profit for every ₱1 staked, so they are always the decimal odds minus 1. Decimal odds of 2.50 become 1.50 in Hong Kong format, and a ₱100 bet wins ₱150 profit.
Malay odds
Malay odds can be positive or negative. A positive number, from 0 to 1, works like Hong Kong odds: 0.80 means you win ₱0.80 profit per ₱1 staked. A negative number shows how much you stake to win ₱1: −0.67 means a ₱0.67 stake wins ₱1 profit, which is the same as decimal odds of 2.50.
Indonesian odds
Indonesian odds follow the same idea as American odds, divided by 100. A positive number shows the profit per ₱1 staked, and a negative number shows how much you stake to win ₱1. Odds of −2.00 match American −200, and +1.50 matches American +150.
Odds conversion table
The table shows the same prices in all six formats, with the implied probability for each. Converted odds are rounded, which is why 1.91 and 10/11 match closely rather than exactly.
| Decimal | Fractional | American | Hong Kong | Malay | Indonesian | Implied probability |
|---|---|---|---|---|---|---|
| 1.25 | 1/4 | −400 | 0.25 | +0.25 | −4.00 | 80.0% |
| 1.50 | 1/2 | −200 | 0.50 | +0.50 | −2.00 | 66.7% |
| 1.80 | 4/5 | −125 | 0.80 | +0.80 | −1.25 | 55.6% |
| 1.91 | 10/11 | −110 | 0.91 | +0.91 | −1.10 | 52.4% |
| 2.00 | 1/1 (evens) | +100 | 1.00 | +1.00 | +1.00 | 50.0% |
| 2.50 | 3/2 | +150 | 1.50 | −0.67 | +1.50 | 40.0% |
| 3.00 | 2/1 | +200 | 2.00 | −0.50 | +2.00 | 33.3% |
| 4.00 | 3/1 | +300 | 3.00 | −0.33 | +3.00 | 25.0% |
| 5.00 | 4/1 | +400 | 4.00 | −0.25 | +4.00 | 20.0% |
| 11.00 | 10/1 | +1000 | 10.00 | −0.10 | +10.00 | 9.1% |
How to convert betting odds
Every format can be converted through decimal odds. Convert the price you have into decimal first, then from decimal into the format you want.
| Conversion | Formula |
|---|---|
| Fractional to decimal | (top number ÷ bottom number) + 1 |
| Decimal to fractional | Decimal − 1, written as a fraction (1.50 → 0.50 → 1/2) |
| Positive American to decimal | (American ÷ 100) + 1 |
| Negative American to decimal | (100 ÷ the American number without the minus sign) + 1 |
| Decimal to American, 2.00 or above | +(decimal − 1) × 100 |
| Decimal to American, below 2.00 | −100 ÷ (decimal − 1) |
| Decimal to Hong Kong | Decimal − 1 |
| Decimal to Malay | Decimal − 1 if the result is 1 or less; otherwise −1 ÷ (decimal − 1) |
| Decimal to Indonesian | Decimal − 1 if decimal is 2.00 or above; otherwise −1 ÷ (decimal − 1) |
Example
To convert −110 to decimal, divide 100 by 110 (0.909) and add 1. The result is 1.909, which sportsbooks show as 1.91.
What odds say about probability
Odds can be turned into an implied probability, the chance of an outcome according to the price. It’s a quick way to compare prices across formats and sportsbooks.
| Format | Implied probability formula |
|---|---|
| Decimal | 1 ÷ decimal odds |
| Fractional (a/b) | b ÷ (a + b) |
| Negative American | American ÷ (American + 100), using the number without the minus sign |
| Positive American | 100 ÷ (American + 100) |
Decimal odds of 1.80 imply a 55.6% chance (1 ÷ 1.80), and American odds of +150 imply 40% (100 ÷ 250). Implied probability is the sportsbook’s price, not a forecast, and outcomes with low implied probability still happen regularly.
The bookmaker’s margin
Add up the implied probabilities of every outcome in a market and the total is usually above 100%. The extra is the bookmaker’s margin, also called the vig, juice, or overround, and it’s how sportsbooks make money. A two-way market priced at 1.91 on both sides adds up to 104.7%, a margin of about 4.7%.
Three-way markets work the same way. Football odds of 2.10 for the home team, 3.40 for the draw, and 3.50 for the away team add up to 105.6%. Those are the 1X2 prices used in our football betting guide. Removing the margin from those prices gives “fair” odds of about 2.22, 3.59, and 3.70.
Key takeaway
Because of the margin, the odds you bet at are always a little lower than the fair odds, which is why betting is not a reliable way to make money.
Odds-on, odds-against and even money
These three terms describe where a price sits compared with even money. They appear in commentary, previews, and sportsbook listings across every format.
| Term | Meaning | Decimal | Fractional | American |
|---|---|---|---|---|
| Odds-on | Profit is less than the stake; implied chance above 50% | Below 2.00 | Below 1/1, such as 1/2 | Negative, such as −200 |
| Even money | Profit equals the stake; implied chance 50% | 2.00 | 1/1 | +100 |
| Odds-against | Profit is more than the stake; implied chance below 50% | Above 2.00 | Above 1/1, such as 3/1 | Positive, such as +300 |
How parlay odds are calculated
A parlay, or accumulator, combines several selections into one bet. The decimal odds of each selection are multiplied together, and every selection must win for the parlay to pay.
Example
Two selections at 1.91 give combined odds of 3.65 (1.91 × 1.91), and three give 6.97. A ₱100 three-leg parlay would return about ₱697, but one losing leg loses the whole bet.
The margin multiplies too, so the bookmaker’s edge on a parlay is larger than on any single selection in it.
Why odds change
Odds move before and during a game. Sportsbooks adjust prices after team news such as injuries and lineups, and as money comes in on one side, to balance their exposure.
In live betting, odds update with the score and the clock, sometimes within seconds. The odds on your bet slip when you confirm are the ones that count, so a bet placed earlier keeps its original price even if the line moves later.
Common mistakes when reading odds
Most mistakes with odds come from mixing up what a number includes. These are the ones to watch for, especially when switching between formats or sportsbooks.
- Confusing return with profit. Decimal odds include your stake; fractional, American, and Asian formats show profit only.
- Reading a minus sign as a loss. In American, Malay, and Indonesian odds, a negative number describes the stake needed to win a set amount, not a losing bet.
- Comparing different formats directly. 1.50 in decimal and 1.50 in Hong Kong odds are different prices; convert both to decimal first.
- Ignoring the margin. Two sides priced at 1.91 don’t add up to 100%, so neither price is “fair.”
Which odds format should you use?
Every format shows the same price, so the choice only affects how easy the numbers are to read. Decimal odds are usually the simplest because the total return is one multiplication, and they are the default at most sportsbooks in the Philippines. Some sportsbooks let you change the display format in your account settings; our sportsbook guide covers how licensed sportsbooks work.
Whichever format you use, check the potential return on your bet slip before you confirm, and only bet what you can afford to lose. Betting is for adults aged 21 and over, and no odds format or calculation guarantees a win.
