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How do NHL power-play, penalty-kill and shorthanded-goal statistics fit together?
The NHL glossary defines power-play percentage as power-play goals divided by power-play opportunities. It defines penalty-killing percentage as situations killed divided by shorthanded situations, and describes a shorthanded goal by the scoring club’s manpower disadvantage. These are related labels, but they are not interchangeable calculations.
For Hockey readers and bettors interpreting NHL scoring and statistics · Updated
Power-play percentage uses opportunities
For the power-play rate, divide power-play goals by power-play opportunities. The denominator is the count of opportunities, not the number of goals, penalties, or minutes. Use a complete opportunity count for the same stated sample before interpreting the percentage.
The NHL glossary gives this formula but does not define a provider’s event-counting implementation or a season window. It is safest to state the exact sample and source rather than attach a rate to an unstated provider or time period.
Penalty-killing percentage counts situations killed
The glossary describes penalty-killing percentage in two steps: subtract power-play goals allowed from shorthanded situations to get power plays killed, then divide by the total shorthanded situations. Put another way, the rate is the share of those stated situations in which no power-play goal was allowed under the displayed definition.
Do not derive the denominator from penalty minutes alone. The source names shorthanded situations, not a conversion from minutes, and it does not explain all provider-specific handling. If the complete situation count is missing, the percentage cannot be recomputed from these instructions alone.
A shorthanded goal is a separate manpower label
The glossary calls a goal shorthanded when the scoring club is at a manpower disadvantage. It says the same cases apply as for power-play goals in the opposite manner, but does not provide a complete penalty taxonomy here. Keep the label tied to the stated manpower condition.
Do not assume that the shorthanded-goal label changes either percentage’s denominator. The glossary defines the label and the two rates separately; it does not specify how every event appears in a data provider’s statistics feed.
State the sample and source scope
For any calculation, report the selected club, the complete count of opportunities or situations, the goals scored or allowed, and the exact sample window. The examples below are fictional arithmetic exercises, not current-season results or a claim about a named provider.
The NHL glossary page has no displayed publication date or version. This article explains the wording visible there; it does not assert that the page is a current rulebook for every league or data feed.
Three separate hypothetical records
Power play: in one fictional sample window, Blue has four counted power-play opportunities and scores one power-play goal. The rate is 1 ÷ 4 = 25%. Penalty kill: in a separate fictional sample window, Red faces five counted shorthanded situations and allows one power-play goal. It kills 5 − 1 = 4 situations, so the rate is 4 ÷ 5 = 80%. Shorthanded goal: in a separate fictional play, Red is stipulated to be at a manpower disadvantage when it scores; the glossary’s label for that goal is shorthanded. These examples do not represent a real season, provider record, game, or wager, and they do not combine the three samples.
Related questions
Can I calculate penalty-killing percentage from penalty minutes alone?
The NHL glossary’s formula uses shorthanded situations and power-play goals allowed. It does not provide a conversion from penalty minutes to the situation count, so minutes alone are not enough under the stated formula.
Does the glossary say a shorthanded goal changes the percentage denominators?
The page defines shorthanded goals by manpower disadvantage and separately defines the two percentages. It does not specify provider-level event interactions, so do not infer a denominator adjustment from this glossary alone.