+150 · positive odds
A $10 winning wager earns $15 profit, for a $25 total return.
Implied probability: 100 ÷ (150 + 100) = 40%.
HARTLINE / LEARN
Make an informed pick.
Understand the odds, compare the market, and use HartLine’s reasoning to decide which bets fit your approach.
Before your first wager
- Understand the selection, line, and settlement rules.
- Choose an amount you can afford to lose. Never use money needed for bills or borrow to bet.
- Check the accepted price and potential profit, then record the wager.
- Set money and time limits. Avoid chasing losses or treating betting as income.
You can explore HartLine without placing a bet. Predictions are uncertain; no pick or parlay is guaranteed.
What do +150 and −150 mean?
−150 · negative odds
A $15 winning wager earns $10 profit, for a $25 total return.
Implied probability: 150 ÷ (150 + 100) = 60%.
A losing wager loses its stake. These examples are separate prices, not opposite sides of one market. Sportsbook margin means implied probability is not a forecast.
Why parlays are harder
If three independent selections each have a true 60% chance of winning, the chance all three win is 0.6 × 0.6 × 0.6 = 21.6%. This example does not apply to related selections or establish fair sportsbook pricing.
Explore picks and their reasoning →Appendix · betting terms
Open any term for its definition.
Anytime touchdown
Usually a bet that a player scores a touchdown. Passing a touchdown typically does not count as scoring one; check your sportsbook’s rules.
Confidence
A model’s estimate or rating, not a guarantee. HartLine’s estimates should be evaluated against actual results over time.
Expected value (EV)
An estimate based on a probability and a price. If the probability estimate is wrong, the EV estimate can be wrong too.
Implied probability
The break-even probability represented by a price before accounting for sportsbook margin. It is not a measured chance of winning.
Line shopping
Comparing the same market across sportsbooks. Check the line, price, timing, and settlement rules together.
Live odds
Prices offered during a game. They can change quickly; the accepted ticket determines your actual wager.
Moneyline
A bet on who wins the game. A negative price marks the favorite; a positive price marks the underdog.
Parlay
Multiple selections combined into one wager. Usually every leg must win. A higher potential payout comes with a lower chance of winning. Void and push rules vary.
Prop
A bet on a specific outcome, such as a player’s rushing yards. Check the exact market and participation rules.
Push / void
A push is a tie against the betting line; a void is a canceled selection. A standalone stake is typically returned, but parlay treatment depends on house rules.
Same-game parlay
A parlay with selections from one game. The outcomes can be related, so its price cannot reliably be calculated by multiplying standalone odds.
Spread
A points handicap. A team at −3.5 must win by at least 4 points to cover; a team at +3.5 can lose by up to 3 points or win outright.
Stake / return / profit
Stake is the amount risked. Return includes your original stake; profit is the return minus the stake.
Total / over-under
A bet on whether a game’s combined score finishes above or below a listed number.
Unit
A consistent personal reference amount for tracking wagers. It is not a universal dollar value or a reason to increase spending.
Variance
The natural swing in results. Short winning or losing streaks do not establish whether a prediction method works.
Vig / juice
The sportsbook’s margin built into its prices. The implied probabilities for all possible outcomes often add to more than 100%.
Useful resources
Your sportsbook’s official house rules are the source for market eligibility, player participation, voids, overtime, and settlement.
International Center for Responsible Gaming ↗ — research and education about gambling-related harm.
For adults of legal betting age where permitted. Use your sportsbook’s deposit limits, time-outs, or self-exclusion tools if betting stops feeling manageable.