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ParHard Index estimator

Enter your last few scores and get your ParHard Index: our own, openly published estimate of how far over or under par you usually play 18 holes.

Newest round first. Up to 10 rounds count; 3 are needed. A 9-hole round's score and par are for 9 holes.

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Enter at least 3 rounds to see your ParHard Index.

Play it in ParHard

The app tracks every round and keeps your ParHard Index up to date.

How it works

  1. Step 1

    Add your recent rounds

    Enter the score and the par for up to your last 10 rounds, newest first. Mark 9-hole rounds as 9 holes.

  2. Step 2

    Read your index

    Your ParHard Index appears with the rounds it used and the ones it set aside.

  3. Step 3

    Keep it current

    Track rounds in the app and the index updates itself after every round.

The method

  1. For each round, subtract par from your score. A 9-hole round is doubled to an 18-hole equivalent.
  2. Keep your 10 most recent rounds. With fewer than 3 rounds there is no index.
  3. Set aside the highest 20 percent of those results and the lowest 10 percent (rounded down), so one blow-up or one career day does not move the number.
  4. Average what is left and round to one decimal place.

The result is your usual 18-hole score relative to par: +14.0 means you usually shoot about 14 over par. The ParHard Index uses only the scores and pars you give it. It is our own method for tracking your trend, it is not issued by or comparable to any golf association's index, and it does not use course difficulty ratings. If you need an official number, ask your club or association.

Questions

What is the ParHard Index?
It is our own measure of your usual score relative to par over 18 holes. It is built only from the scores you enter and the par of each course.
How is it calculated?
Take your 10 most recent rounds (9-hole rounds count double). Set aside the highest 20 percent and the lowest 10 percent. Average the rest and round to one decimal. With fewer than 3 rounds there is no index.
Is this an official index?
No. It is not issued by or comparable to any golf association's index, and it does not use course difficulty ratings. Use it to see your own trend, and ask your club or association for an official number if you need one.
Why drop the highest and lowest rounds?
One blow-up or one career day should not move your number. The method keeps the middle of your recent play.

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