Free WHS tool
Calculate your WHS score differential
Pick your course and tees, enter your score, and get your World Handicap System differential instantly. We fill in the real course rating and slope for you from a database of more than 24,000 courses.
What is a score differential?
A score differential is the single number the World Handicap System uses to measure how good one round was, relative to the difficulty of the course and tees you played. It is what turns a raw score into something comparable across every course in the world.
The formula
(113 / Slope Rating) × (Adjusted Gross Score − Course Rating − PCC)
In plain English: take how many shots you took, subtract the score a scratch golfer is expected to shoot there (the course rating), then scale it by how much harder the course plays than average (the slope). A lower differential means a better round.
Here is a real one. Shoot a gross 90 at The Heron Country Club off the White tees, which are rated 73.4 with a slope of 131, and the maths runs (113 / 131) × (90 − 73.4) = 0.863 × 16.6 = a differential of 14.3. The same 90 at an easier, flatter course would give a higher differential, because it was a less impressive score for the test in front of you.
One detail the calculator simplifies: the official system caps each hole at a Net Double Bogey before it adds your score up, which is the “adjusted” in Adjusted Gross Score. This tool assumes you did not blow up any single hole, so on a normal round it matches your posted differential exactly.
How does this become my handicap?
Your Handicap Index is not one differential, it is the average of the best 8 of your most recent 20. The system always works from your better rounds, so your index reflects what you are capable of on a good day rather than your average day. With fewer than 20 rounds posted, it uses a smaller sample and a small adjustment until your full record builds up.
Doing that by hand across 20 rounds is a chore. Track your rounds in Golf Handicapp and it keeps the best 8 of 20 up to date for you, applies the soft cap and hard cap, and shows you the working so the number is never a black box.
Handicap calculator questions
What is a good golf handicap?+
It depends who you ask, but a handicap index in the low single figures is strong club-golfer territory, around 10 is a solid all-rounder, and the average male golfer sits in the mid-teens with women a little higher. The maximum index under WHS is 54.0, so there is room for everyone, and the only number that really matters is whether yours is trending down.
Why is there a 113 in the formula?+
113 is the slope rating of a course of standard difficulty. Dividing 113 by the slope of the tees you played scales your round to that standard, so a round at a brutally hard course counts for more than the same gross score at an easy one. A tee with a slope of exactly 113 leaves the adjustment at 1, so it has no effect.
What is PCC and do I need to worry about it?+
PCC is the Playing Conditions Calculation. After everyone has posted their scores for the day, the system checks whether conditions made scoring unusually hard or easy and nudges every differential by a small amount, usually zero. You never calculate it yourself, and for a quick estimate you can ignore it, which is what this calculator does.
Can I get an official handicap without joining a club?+
Yes. In Great Britain and Ireland you can hold an official WHS index through England Golf's iGolf, Wales Golf, Scottish Golf or the GUI without club membership. The United States uses GHIN, Australia uses Golf Australia. This calculator gives you the maths instantly; an official index needs an authorised body to hold your record.
How accurate is this calculator?+
The score differential it returns is exact for the course rating and slope you select. It assumes your gross score has no holes worse than a Net Double Bogey and takes the Playing Conditions Calculation as zero, so on a normal round it matches your posted differential. On a round where you blew up a hole or two, your posted differential would be slightly lower.
Understand the numbers
- How the WHS handicap is calculated
- What is a handicap differential?
- Course Rating vs Slope Rating explained
- Browse all 24,000+ courses
Last updated 18 June 2026.
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