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.

March Madness Upset Predictor

Analyze historical NCAA Tournament upset rates, identify Cinderella candidates, and find value in underdog betting.

Historical Upset Rates (1985-2024)

12 over 5 Analysis

35.3%

Upset Rate

Total Upsets

156

Total Games

Notable: Multiple every year - most common upset

Recent Cinderella Runs (Final Four or Better)

FAU (2023)#9 Seed

C-USA → Final Four

St. Peter's (2022)#15 Seed

MAAC → Elite 8

UCLA (2021)#11 Seed

Pac-12 → Final Four

Loyola Chicago (2018)#11 Seed

MVC → Final Four

Syracuse (2016)#10 Seed

ACC → Final Four

Wichita State (2013)#9 Seed

MVC → Final Four

VCU (2011)#11 Seed

CAA → Final Four

George Mason (2006)#11 Seed

CAA → Final Four

Key Upset Indicators

Underdog Strengths

✓Senior-heavy roster (experience matters)
✓Top-50 defensive efficiency
✓Elite 3-point shooting (35%+)
✓Low turnover rate
✓Won conference tournament

Favorite Weaknesses

✗Young/freshman-heavy roster
✗Key player injury concerns
✗Poor free throw shooting
✗Lost late-season games badly
✗Reliant on one star player

March Madness Betting Strategy

• Target 12 seeds at +600 to +900 - historically undervalued
• Fade public favorites in 5/12 and 6/11 matchups
• Look for mid-major conference tournament winners
• Consider underdog moneylines over spreads in first round

Data based on NCAA Tournament results from 1985-2024. Individual matchups depend on team-specific factors beyond seed numbers.

📖Deep Dive: 12-5 Upset Formula

Use the Cinderella Score formula to predict which 12-seeds will upset 5-seeds based on guard play, 3PT shooting, and tournament DNA.

Read 12-5 Upset Formula Guide →

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
Review Matchup Data: See historical upset rates for each seed matchup since 1985.
2
Identify Patterns: Look for conferences and situations that produce more upsets.
3
Study Cinderellas: Analyze past Cinderella runs to identify potential deep-run candidates.
4
Find Value: Compare sportsbook odds to historical upset frequencies.

Frequently Asked Questions

Which upset is most likely in March Madness?

The 12 vs 5 matchup produces the most upsets relative to expectation - 12 seeds win about 35% of the time. The 8 vs 9 game is essentially a coin flip at 47-53%.

What makes a team a Cinderella candidate?

Look for: experienced rosters (seniors), strong defensive teams, good 3-point shooting, teams that won their conference tournament, and mid-majors with top-50 offenses.