Winning percentage calculator
Win percentage with NFL-style ties, games back, batting average, on-base percentage and ERA.
- ๐บ๐ธ US federal & state rules
- See sources
Winning percentage
.618
10-6-1, 61.8%
- Games played
- 17
- Wins minus losses
- +4
- Ties counted as
- half a win
This is an example. Enter your numbers above and press the button to see your own result.
- The NFL counts a tie as half a win and half a loss. MLB and NBA games cannot end in a tie, so the two rules give the same answer there.
Show the math
| Formula | (10 + 1 รท 2) รท 17 = .618 |
|---|
What to do next
How it works
Winning percentage is wins divided by games. With the NFL rule, each tie adds half a win and still counts as a game played. Baseball writes it with three decimals and no leading zero, like .625.
Batting average is hits divided by at-bats. On-base percentage adds walks and hit by pitch to the top, and walks, hit by pitch and sacrifice flies to the bottom. ERA is earned runs times 9 divided by innings pitched.
Things to keep in mind
The NHL ranks teams by points, not winning percentage, and many youth leagues use their own tiebreak rules. Check your league rules before using these numbers for seeding.
For innings pitched, enter the box score number. The calculator turns .1 and .2 into thirds for you.
Sources
- MLB Glossary: Earned Run Average (9 ร earned runs รท innings pitched)Checked 2026-10-19
- MLB Glossary: On-base PercentageChecked 2026-10-19
- NFL tiebreaking procedures (ties count as one-half win and one-half loss)Checked 2026-10-19
Frequently asked questions
How do you calculate winning percentage?
Divide wins by games played. A 10-6 team wins 10 รท 16, which is .625.
How do ties count in the NFL?
The NFL counts a tie as half a win and half a loss. A 10-6-1 team is (10 + 0.5) รท 17, which is .618.
How are games back calculated?
Add the leader's extra wins to your extra losses and divide by 2. A 88-74 team behind a 92-70 leader is ((92 - 88) + (74 - 70)) รท 2 = 4 games back.
What does 6.1 innings mean in ERA?
Each out is a third of an inning, so 6.1 is 6 1/3 innings and 6.2 is 6 2/3. 18 earned runs in 62.1 innings is an ERA of 2.60.