# Fantasy Matchup Win Probability Calculator

Estimate your chance of winning a head-to-head fantasy matchup from both teams’ projected points and how much scores vary.

- URL: https://toolstackhub.co.uk/tools/fantasy-matchup-win-probability-calculator/
- Category: Calculators
- Price: free, no sign-up
- Privacy: runs in the browser; input is not uploaded
- Last updated: 2026-10-08

## About
The Fantasy Matchup Win Probability Calculator estimates your chance of winning a head-to-head week. Enter both teams’ projected points and a standard deviation, which says how much a team’s score swings from its projection, and it returns the win chance using the normal distribution. A bigger spread means more upsets. It is a simple model for fun and planning, not a prediction of any player’s performance.

## How to use
1. Enter your team’s projected points and your opponent’s.
2. Enter a standard deviation for each team, which is how far a score usually strays from its projection. 20 is a reasonable starting point.
3. Read your win chance and the odds. Raise the spread to see how much an underdog benefits from more variance.

## FAQ
**How is win probability calculated?** The difference between the two scores is treated as a bell curve centred on the gap between the projections. The chance the difference is above zero is your win chance.

**What is a good standard deviation for fantasy football?** Weekly team scores often vary by about 15 to 30 points. 20 is a common starting figure.

**Why does a bigger spread help the underdog?** More randomness makes the projected gap matter less, so the result moves towards 50-50.

**Is the Fantasy Matchup Win Probability Calculator free?** Yes, with no sign-up or limits.