This template calculates the winning percentage given three parameters: wins, losses and ties. Those three parameters are unnamed.

{{Winning percentage|<wins>|<losses>|<ties>}}

Wins and losses are required while ties are optional. In addition, including |leading_zero=y will add a leading 0 before the period (.), while adding |record=y will show the record followed by the winning percentage.

In scenarios where ties aren't regarded as half a win, using |ignore_ties=y will omit ties and equate the winning percentage exactly as wins divided by the total number of games/matches played (i.e. wins plus draws plus losses).

Code Result
{{Winning percentage|30|20}} .600
{{Winning percentage|30|20|50}} .550
{{Winning percentage|30|20|50|ignore_ties=y}} .300
{{Winning percentage|100|50|record=y}} 100–50 (.667)
{{Winning percentage|100|50|3|leading_zero=y|record=y}} 100–50–3 (0.663)
{{Winning percentage|100|50|leading_zero=y}} 0.667
{{Winning percentage|100|0}} 1.000
{{Winning percentage|0|4}} .000
{{Winning percentage|0|0}}