Last updated: 10 September 2026
Quick Answer: A $100 bet at +200 actually pays $200 profit and returns $300, while -300 means risking $300 to win $100. The minus sign marks the favorite and the plus sign the underdog. Those two prices imply 33.3% and 75% win probability, and the same arithmetic exposes the margin in any Power.win price.
+200 and -300 are the two prices most likely to trip you up, and they turn up on almost every line you look at. American odds don’t state a probability directly. They price an outcome against a $100 reference, and the sign tells you which side of even money it sits on. Convert that number into a percentage and you can read a whole betting board in about ten seconds. This article covers the math of American odds; the crypto casino glossary covers the vocabulary.
What does +200 mean for odds?
A price of +200 pays $200 in profit for every $100 you stake. Win the ticket and you collect $300 in total: the $200 profit plus the $100 you put up. The plus sign marks the underdog, the side the market rates less likely to win.
The math is simple. Profit equals your stake multiplied by the odds, divided by 100. At +200 that reduces to your stake times 2, so $100 staked wins $200 in profit, and the $100 stake comes back as well.
The $100 in that formula is a reference unit, not a minimum. The ratio holds whatever you stake:
- $25 at +200 wins $50 in profit and returns $75
- $40 at +200 wins $80 in profit and returns $120
- $10 at +200 wins $20 in profit and returns $30
The figure that comes after ‘plus’ is a distance, not a difficulty score. A +150 pays less than +200 because the outcome is viewed as more probable. On the other hand, +400 pays more because the outcome is assumed to be less probable. Read the sign for direction and the number for size, and you have answered two questions: which side and how distant from even money.
What does -300 mean in betting?
A price of -300 means that you will have to bet $300 in order to profit $100, and that ticket will pay you $400. The minus sign indicates that this is for the favorite, and the number shows how much you must stake to reach that same $100 reference.
Arithmetically this is the plus price inverted. Your profit would be equal to the amount you wagered times 100 divided by the odds. If you wager at -300, the arithmetic becomes your stake divided by three:
- $60 at -300 wins $20 in profit and returns $80
- $30 at -300 wins $10 in profit and returns $40
- $150 at -300 wins $50 in profit and returns $200
A larger number after the minus sign means a shorter price and a smaller payout, which is the opposite of how plus prices behave. That reversal is the single most common misreading of an American board.
The cost of a miss at -300 is worth seeing. Three winning $300 tickets at -300 make you $300 in profit. One losing ticket at the same price costs you $300, so a single miss wipes out three hits. Heavy favorites are a short price for a reason, and the margin doesn’t shrink just because the outcome looks likely. The implied-probability section further down works that out in full: the +200/-300 market carries a 7.69% margin, against 4.55% on a standard -110 book.
What do the odds +/- mean in betting?
One sign and one number carry two separate pieces of information. A plus price marks the underdog, and it pays you more in profit than you staked. A minus price marks the favorite, and it pays you less in profit than you staked. Even money sits at +100, where a $100 stake wins exactly $100 in profit, and the size of the number tells you how far from that point the price has moved.
Here’s the same set of prices written every way a sportsbook might show them.
| American odds | Profit on a $100 stake | Total return | Decimal | Fractional | Implied probability |
|---|---|---|---|---|---|
| +300 | $300.00 | $400.00 | 4.00 | 3/1 | 25.00% |
| +200 | $200.00 | $300.00 | 3.00 | 2/1 | 33.33% |
| +150 | $150.00 | $250.00 | 2.50 | 3/2 | 40.00% |
| +100 | $100.00 | $200.00 | 2.00 | 1/1 | 50.00% |
| -110 | $90.91 | $190.91 | 1.91 | 10/11 | 52.38% |
| -150 | $66.67 | $166.67 | 1.67 | 2/3 | 60.00% |
| -200 | $50.00 | $150.00 | 1.50 | 1/2 | 66.67% |
| -300 | $33.33 | $133.33 | 1.33 | 1/3 | 75.00% |
Read across any row and every column is stating the same price a different way. Learn the -110 row by sight, because it’s the price you’re quoted most often in a two-way market: a $100 stake there returns $190.91.
How do you convert American odds to decimal and fractional?
Decimal is the easiest format to work with, because your total return is just the stake multiplied by the decimal. Each sign converts a different way.
To get the decimal from a plus price, divide the odds by 100 and add one. That turns +200 into 3.00, and $100 multiplied by 3.00 returns $300.
To get the decimal from a minus price, divide 100 by the odds and add one. That turns -300 into 1.3333, which boards round to 1.33, and $100 multiplied by 1.3333 gives $133.33.
Going the other way is just as quick. If the decimal is 2.00 or higher, subtract 1 and multiply by 100 for the plus price. If it’s under 2.00, subtract 1 and divide 100 by the result for the minus price. Decimal 1.91 comes back as -110, give or take a rounding point.
Fractional odds show the ratio of profit to stake, reduced. That matches how Wolfram MathWorld treats betting odds: a ratio that corresponds to the probability of winning. So +200 is 2/1, two units of profit for every one unit staked. Flip to -300 and you get 1/3, one unit of profit for every three staked. Any price that pays less profit than your stake lands below 1 as a fraction, which is why favorites look inverted in this format.
What is implied probability, and where does the sportsbook’s margin sit?
Implied probability restates a price as the percentage chance it corresponds to, and it’s the single measure that lets you compare prices directly against each other. Plus and minus each have their own formula.
To get the implied probability of a plus price, divide 100 by the odds plus 100. At +200 that’s 100 divided by 300, which is 33.33%.
To get the implied probability of a minus price, divide the odds by those same odds plus 100. At -300 that’s 300 divided by 400, which is 75.00%.
Now add the two sides of the market together. A market quoted +200 and -300 implies a 33.33% chance on one side and a 75.00% chance on the other, and those total 108.33%. A genuine probability distribution cannot do that. The NIST/SEMATECH e-Handbook of Statistical Methods sets out the rule being broken here: across all possible outcomes of a discrete variable, the probabilities sum to 1. A priced market sums to more than 1, and that surplus is the sportsbook’s margin, usually called the overround.
Two more steps turn that overround into a rate. Divide 1 by 1.0833 to get 0.9231, then subtract that from 1: the margin is 7.69%. Run the same calculation on a standard two-sided market priced -110 on both sides, and 52.38% plus 52.38% is 104.76%, for a margin of 4.55%.
The margin isn’t a hidden cost. It’s visible in the odds: convert both sides to percentages and you have it for the bet in front of you. The casino-game equivalent is the house edge.
Read More: RTP, House Edge, and Variance: Casino Math for Humans
What does a +7 spread mean?
A +7 spread gives the team a notional seven-point head start, added to its final score. Win the game, or lose it by six points or fewer, and the ticket wins. Lose by eight or more and the ticket loses. Lose by exactly seven and the bet is a push: your stake comes back intact.
Every spread carries two numbers, and they do different jobs. The handicap decides whether your ticket wins. The price decides how much it pays if it does.
Those two numbers move independently of each other. Shift the handicap to +7.5 and the push disappears, because no team loses by half a point. Shift the price instead, from -110 to -120, and the handicap is untouched: a $100 stake now wins $83.33 in profit rather than the $90.91 the -110 row above shows.
Pushes, no-results and delayed events each settle under their own published rule. The sportsbook rules page sets out how markets are settled, including cash outs and how disputes are resolved.
What should you check before you place a bet?
There are five checks, and once you are used to the conversions they take under a minute. The first three are about the numbers; the last two are about the ticket and the operator behind it.
Which format the board is showing. A price of 3.00 and a price of +200 are identical, and so are 1.33 and -300. Confirm the format before you convert anything in your head, because reading a decimal as an American price is a large and silent error.
What both sides add up to. Convert each side of the market to implied probability and add them. Anything above 100% is the margin on that market, stated as a number instead of a feeling.
The price at the moment you confirm. Odds move. The number that settles your ticket is the one attached when the bet is accepted, not the one showing when you started typing a stake.
The settlement rules for the market you picked. Pushes, half points, voids and cash out behave differently across market types, and all of it is published rather than assumed.
Who is running the book. Power.win is licensed by the Tobique Gaming Commission, licence 0000209, operated by 3-102-968317 SRL of Costa Rica. The sportsbook covers football, basketball and esports, and takes crypto.
Read More: Best Sportsbooks That Pay Out in Crypto 2026
Frequently Asked Questions
What does +200 mean in betting?
A price of +200 means a $100 stake wins $200 in profit and returns $300 in total. The “+” sign marks the underdog side of the market. Scale it to any stake by multiplying by 2: $25 wins $50, and $10 wins $20. As a probability, +200 implies a 33.33% chance.
What does -300 pay on a $50 bet?
A $50 wager at -300 wins $16.67 in profit and returns $66.67 in total. Minus odds tell you the stake needed to win $100, so at -300 you divide your stake by three. The same price reads as decimal 1.33, fractional 1/3 and an implied probability of 75.00%.
Are +200 and 3.00 the same odds?
Yes. American +200 and decimal 3.00 both return $300 on a $100 stake. The decimal includes your stake in the figure — stake times decimal is your total return — while the American price states net profit against a $100 stake. In fractional odds it is 2/1.
Does a bigger minus number mean a bigger payout?
No, it means a smaller one. At -150 a $100 stake wins $66.67 in profit; at -300 that same stake wins $33.33. The higher the number after the minus sign, the more likely the sportsbook thinks the outcome is, and the less it pays if it happens.
Sources (Citations)
- Wolfram MathWorld, “Odds” — the ratio definition of betting odds and its relationship to the probability of winning
- NIST/SEMATECH e-Handbook of Statistical Methods, 1.3.6.1 — the rule that probabilities across all possible outcomes sum to 1, which is what the overround calculation measures against
- National Council on Problem Gambling, Responsible Gaming — independent guidance on setting limits and recognizing warning signs
Take the Lead, Gamble Responsibly
Understanding what +200 and -300 pay tells you what a ticket costs and what it returns. It doesn’t tell you which side wins, and no conversion makes a losing bet any less likely. Before you place your first wager, decide how much you are willing to spend during the session and use the deposit limits, wagering limits, self-exclusion and Track your Activity tools on the responsible gambling page. If gambling ceases to be enjoyable, stop immediately and use the provided support channels.
By the Power.win Editorial Team