How do moneyline odds work?

Moneyline odds tell you how much profit you make on a given bet. Positive odds (e.g. +250) show how much you profit on a $100 bet — so +250 returns $250 profit. Negative odds (e.g. -150) show how much you must bet to profit $100 — so -150 means bet $150 to win $100.

What does -110 mean in sports betting?

Odds of -110 mean you must bet $110 to profit $100 (for a total return of $210). The extra $10 over your $100 target profit is the sportsbook's vig or juice — their built-in margin. At -110, the implied probability is 52.38%, which is slightly above the true 50% for a coin-flip game.

How do I convert moneyline odds to implied probability?

For negative American odds: implied probability = |odds| / (|odds| + 100). For example, -150 gives 150/250 = 60%. For positive odds: 100 / (odds + 100). For example, +250 gives 100/350 = 28.6%. For decimal odds: 1 / decimal. For example, 2.50 gives 40%.

Moneyline Bet Calculator — American, Decimal & Fractional Odds

American	Decimal	Fractional	Implied %	Label
-300	1.333	1/3	75.0%	Heavy Fav
-150	1.667	2/3	60.0%	Moderate Fav
-110	1.909	10/11	52.4%	Std (w/vig)
+100	2.000	1/1	50.0%	Even Money
+150	2.500	3/2	40.0%	Underdog
+250	3.500	5/2	28.6%	Clear Dog
+350	4.500	7/2	22.2%	Big Dog

1

Enter the Moneyline Odds

Input the American odds for each team or outcome — expressed as positive (+) or negative (-) numbers. Positive odds show how much profit a $100 bet returns. Negative odds show how much you must bet to profit $100. You can enter odds for both sides to compare.

2

Enter Your Bet Amount

Type in the amount you want to wager. The calculator instantly shows your potential payout, profit, and return on investment for the entered odds. Use the Comparison tab to see how different bet sizes affect your return.

3

Review Payout and Implied Probability

See your potential profit, total payout (profit + stake), and the implied probability embedded in the odds. Implied probability reveals what the bookmaker's line suggests about each team's chances of winning — use this to assess whether a bet has value.

Payout for Positive (Underdog) Odds

profit = stake × (odds / 100); total_payout = stake + profit

For positive moneyline odds (e.g., +250), divide the odds by 100 and multiply by your stake to get profit. A $100 bet at +250 returns $250 profit plus the original $100 stake for a $350 total payout. Positive odds indicate the underdog.

Payout for Negative (Favorite) Odds

profit = stake / (|odds| / 100); total_payout = stake + profit

For negative moneyline odds (e.g., -150), divide your stake by the odds divided by 100 to get profit. A $150 bet at -150 returns $100 profit for a $250 total payout. Negative odds indicate the favorite — you must risk more to win less.

Implied Probability

implied_prob (positive) = 100 / (odds + 100); implied_prob (negative) = |odds| / (|odds| + 100)

Implied probability converts odds to the bookmaker's estimated win percentage. +250 implies 28.6% chance; -150 implies 60% chance. Both sides of a market sum to >100% — the 'overround' or 'vig' represents the bookmaker's margin.

Editorial accountability

Owner: Calculover Editorial Team - Sports betting mathematics and odds education

Last reviewed: 2026-05-15

Methodology

Payout formulas use standard American odds arithmetic as applied by licensed U.S. sportsbooks. Implied probability calculations follow the standard conversion from American odds. Responsible gambling guidance derived from National Council on Problem Gambling recommendations.

Assumption: Odds inputs are standard American format (positive or negative integers)

Assumption: No taxes or withdrawal fees are deducted from payout calculations

Assumption: Bet outcomes are binary (win or loss) — push scenarios are not modeled

Assumption: Vig calculation assumes a two-outcome market for simplicity

Limitations & guidance

This calculator does not account for parlay combinations, live in-game odds adjustments, or promotions/bonuses offered by specific sportsbooks

Actual payouts depend on the specific sportsbook's odds at time of bet placement, which may differ from estimated odds

Sports betting is illegal in some U.S. states — check your local laws before wagering

No betting strategy or calculator can predict game outcomes or guarantee profitability

Professional guidance: This calculator is for informational and entertainment purposes only. It does not constitute financial advice or encouragement to gamble. Sports betting involves substantial risk of financial loss. If you or someone you know has a gambling problem, call 1-800-522-4700 (National Problem Gambling Helpline).

Primary sources

Sports Wagering Revenue and Handle Reports - American Gaming Association

Responsible Gambling Resources - National Council on Problem Gambling

Understanding Sports Betting Odds - Nevada Gaming Control Board

Moneyline A type of sports bet where you wager on which team or player will win outright, with no point spread. The odds reflect the relative strength of each side — favorites carry negative odds, underdogs carry positive odds.

American Odds The odds format used by U.S. sportsbooks, expressed as positive or negative integers (e.g., +150, -110). Also called 'moneyline odds.' Positive odds show profit per $100 wagered; negative odds show the amount required to win $100.

Implied Probability The win probability embedded in a set of odds. Calculated by converting odds to a percentage. Because bookmakers build in a margin (vig), the implied probabilities of both sides of a bet sum to more than 100%.

Vig (Vigorish) The bookmaker's commission built into odds, also called 'juice' or 'overround.' A standard -110 line on both sides of a bet implies a vig of approximately 4.5%. Bettors must win more than 52.4% of -110 bets to break even.

Closing Line Value (CLV) The difference between the odds at which you placed a bet and the odds at which the market closed. Consistently beating the closing line is considered one of the strongest indicators of a profitable betting approach.

Expected Value (EV) The average outcome of a bet over many repetitions. A positive EV bet (+EV) is one where your estimated win probability exceeds the implied probability in the odds. Long-run profitability requires consistently finding +EV opportunities.

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NFL Bettor — Underdog Wager

A bettor sees the New England Patriots listed at +210 against the Kansas City Chiefs. He wants to know how much he could win on a $50 bet and what the implied probability of a Patriots win is.

Moneyline Odds +210 Bet Amount $50 Outcome Underdog

A $50 bet at +210 returns $105 profit + $50 stake = $155 total payout. The implied probability of a Patriots win is 32.3% (100 / (210+100)). If the bettor believes the true probability is above 32.3%, this represents a positive expected value bet.

⚾

Baseball Bettor — Heavy Favorite

A bettor wants to wager on the Los Angeles Dodgers, listed at -175 against the San Francisco Giants. She wants to calculate her profit on a $175 bet and understand how much of her stake is at risk relative to potential reward.

Moneyline Odds -175 Bet Amount $175 Outcome Favorite

A $175 bet at -175 returns $100 profit + $175 stake = $275 total payout. The implied win probability for the Dodgers is 63.6% (175 / (175+100)). The risk-reward ratio is unfavorable if the bettor believes the true probability is close to the implied probability — you risk $175 to win $100.

Moneyline betting is the simplest form of sports wagering: pick a winner, collect if right. But the math behind moneyline odds — and how to evaluate whether a bet offers genuine value — is more nuanced than it appears. Understanding implied probability, the bookmaker's margin, and how to calculate expected value turns moneyline betting from a guessing game into a structured analytical exercise.

How American Odds Work

American odds use a $100 reference point. Positive odds (+150, +300) tell you the profit on a $100 bet: +150 means a $100 wager pays $150 profit. Negative odds (-150, -300) tell you how much you must bet to win $100: -150 means a $150 wager pays $100 profit. The favorite always carries negative odds; the underdog carries positive odds. When both sides of a bet are listed at -110 (as in point spread betting), each side is priced symmetrically with the bookmaker collecting vigorish on both sides.

Implied Probability and Bookmaker Margin

Every set of odds implies a win probability. A +200 underdog implies 33.3% chance; a -200 favorite implies 66.7% chance. If both probabilities are added for a two-outcome market, they should sum to 100% in a perfectly efficient market. They don't — they typically sum to 103–110%, with the excess representing the bookmaker's margin (vig). This margin is built into every bet. Over time, the vig is what makes sports betting mathematically unfavorable for bettors who place bets randomly. Identifying true win probabilities above the implied probability — positive expected value (+EV) betting — is the only path to long-run profitability.

Converting Between Odds Formats

Sportsbooks in Europe and Australia often display odds as decimals (e.g., 2.50) or fractions (e.g., 3/2). Decimal odds include the stake: a 2.50 line means $1 bet returns $2.50 total ($1.50 profit). Fractional odds express profit relative to stake: 3/2 means $2 bet profits $3. To convert American to decimal: for positive odds, (odds/100) + 1; for negative odds, (100/|odds|) + 1. American +150 = decimal 2.50 = fractional 3/2. Understanding these conversions allows comparison-shopping across sportsbooks offering different formats.

Responsible Betting and Bankroll Management

Responsible sports betting treats wagering as entertainment with a defined budget — not as income or investment. Set a session or weekly budget before placing any bets and treat losses as the cost of entertainment. Standard bankroll management suggests limiting individual bets to 1–5% of your total betting bankroll to withstand variance. No betting system (Martingale, Kelly Criterion, etc.) eliminates the mathematical disadvantage imposed by the vig. Problem gambling resources are available through the National Council on Problem Gambling at 1-800-522-4700 or ncpgambling.org if betting stops being recreational.

What does +200 moneyline mean?+

A +200 moneyline means you profit $200 for every $100 wagered if the team wins. On a $50 bet, you'd profit $100 for a total payout of $150 (profit + original stake). Positive moneyline odds indicate the underdog in the matchup. The implied probability of a +200 underdog winning is 33.3% (100 divided by 300).

What does -150 moneyline mean?+

A -150 moneyline means you must wager $150 to profit $100. On a $150 bet, you'd receive $100 profit plus your $150 stake back for a total payout of $250. Negative moneyline odds indicate the favorite. The implied probability of a -150 favorite winning is 60% (150 divided by 250).

How do I calculate my payout from moneyline odds?+

For positive odds: multiply your stake by (odds / 100) to get profit, then add back the stake for total payout. For negative odds: divide your stake by (|odds| / 100) to get profit, then add back the stake. Example: $100 at +250 → profit = $250, total payout = $350. Example: $200 at -200 → profit = $100, total payout = $300.

What is a two-way vs. three-way moneyline?+

A two-way moneyline has only two outcomes: Team A wins or Team B wins. If the game ends in a draw (ties are possible in soccer, NFL, NHL), bets are typically refunded (pushed). A three-way moneyline includes a draw as a third betting option — you can explicitly bet on a tie. Three-way lines are common in soccer and are distinct from two-way lines because all bets lose if the game ends differently than predicted. Three-way lines offer higher payouts but the no-draw option eliminates the push.

How do I know if a moneyline bet has good value?+

Compare the implied probability from the odds to your own estimate of the team's true win probability. If you believe Team A has a 45% chance of winning but the moneyline implies only a 37% probability, the bet has positive expected value (+EV) in your estimation. There is no guaranteed method — it requires both accurate probability estimation and finding lines where the bookmaker's implied probability is lower than the true probability. Shopping multiple sportsbooks for the best available line on the same game (line shopping) is the most consistently effective value-finding strategy.

Moneyline Bet Calculator

Your Bet

Odds Converter

Common Odds Reference

Payoff Comparison

Understanding the Chart

How to Use This Calculator

Enter the Moneyline Odds

Enter Your Bet Amount

Review Payout and Implied Probability

Formula & Methodology

Trust, Methodology & Sources

Key Terms Explained

Real-World Examples

NFL Bettor — Underdog Wager

Baseball Bettor — Heavy Favorite

How Moneyline Betting Works: Odds, Payouts, and Expected Value

How American Odds Work

Implied Probability and Bookmaker Margin

Converting Between Odds Formats

Responsible Betting and Bankroll Management

Frequently Asked Questions

How to Use This Calculator

Moneyline Formulas

FAQ

Moneyline Bet Calculator

Your Bet

Odds Converter

Common Odds Reference

Payoff Comparison

Understanding the Chart

How to Use This Calculator

Enter the Moneyline Odds

Enter Your Bet Amount

Review Payout and Implied Probability

Formula & Methodology

Trust, Methodology & Sources

Key Terms Explained

Real-World Examples

How Moneyline Betting Works: Odds, Payouts, and Expected Value

How American Odds Work

Implied Probability and Bookmaker Margin

Converting Between Odds Formats

Responsible Betting and Bankroll Management

Frequently Asked Questions

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