How do I use a sports betting odds calculator?

Enter your bet amount and the odds (American, Decimal, or Fractional format) into the calculator. It will instantly show your potential payout and profit. Our free sports betting odds calculator works for all sports including NFL football, NBA basketball, and MLB baseball.

How do I convert American odds to decimal odds?

For positive American odds: Decimal = (American/100) + 1. For negative American odds: Decimal = (100/|American|) + 1. For example, +150 American = 2.50 Decimal, and -150 American = 1.67 Decimal. Use our free odds converter for instant conversions.

What is the best free parlay calculator?

SportsBettingOddsCalculator.com offers the best free parlay calculator online. Enter up to 15 legs with American, Decimal, or Fractional odds to instantly calculate your total parlay payout and implied probability.

How do I calculate my betting payout?

Use our bet payout calculator: enter your stake and odds. For American odds, if positive: Payout = Stake × (Odds/100) + Stake. If negative: Payout = Stake × (100/|Odds|) + Stake. Our calculator does this instantly for any odds format.

What is an odds payout chart?

An odds payout chart shows potential winnings at different odds levels. Our calculators provide dynamic payout charts for any stake amount, showing payouts for common odds like -110, +100, +150, -200, and more.

MLB Synthetic -1 Run Line Calculator

Create a synthetic -1 run line bet by combining moneyline and -1.5 run line wagers. Get a push on 1-run wins instead of a loss.

Synthetic -1 Run Line Calculator

Moneyline Odds

-1.5 Run Line Odds

Total Stake ($)

What is a Synthetic -1 Run Line?

A synthetic -1 run line is a betting strategy that combines a moneyline bet with a -1.5 run line bet to create a wager that effectively functions as a -1 run line. This is useful because most sportsbooks only offer -1.5 run lines, not -1.

Why use this strategy? In MLB, approximately 30% of games are decided by exactly one run. With a standard -1.5 run line, a 1-run victory results in a loss. By creating a synthetic -1, you convert that scenario into a push (you get your money back), only winning on 2+ run victories.

How It Works

The calculator determines the exact stake split between the moneyline and -1.5 run line bets so that:

Win by 2+ runs: Both bets win - maximum profit
Win by exactly 1 run: ML wins, RL loses - break even (push)
Lose or tie: Both bets lose - total stake lost

This is a legitimate betting technique used by sharp bettors who want to reduce variance while still backing favorites. It's particularly valuable when you like a team but don't trust them to cover the full 1.5 runs.

This calculator is for informational and educational purposes only. Results should be verified with your sportsbook before placing any wagers. All betting carries risk. Full Disclaimer

How to Use This Calculator

1
Enter Moneyline Odds: Input the current moneyline odds for your team (e.g., -150)
2
Enter -1.5 Run Line Odds: Input the -1.5 run line odds (e.g., +130)
3
Set Total Stake: Enter your total combined wager amount
4
View Stake Split: Calculator shows exact amounts to bet on each side
5
Understand Outcomes: See payouts for 1-run wins, 2+ run wins, and losses

Frequently Asked Questions

What is a synthetic -1 run line?

A synthetic -1 run line is created by combining a moneyline bet with a -1.5 run line bet in specific proportions. This creates an outcome where you push (get your money back) on 1-run wins, win on 2+ run wins, and lose only on losses or ties.

Why would I want a -1 run line?

Many sportsbooks only offer -1.5 run lines, not -1. If you like a team but think they might win by exactly 1 run, a synthetic -1 protects you from that scenario by converting it to a push instead of a loss.

Is this legal?

Yes, absolutely. You're simply placing two separate legal bets that, when combined, create a different risk profile. This is a common strategy used by sharp bettors.