Portsmouth Yardstick
The Portsmouth Yardstick (PY) is the most widely used dinghy handicap system in the UK. These guides explain how it works and provide free calculators and the national number lists.
How the Portsmouth Yardstick works
Portsmouth Numbers, where they come from, and a short history.
How PY returns work
How clubs' race results feed the national recalculation each year.
Corrected time formula
How the corrected-time formula works, with a worked example and edge cases.
Corrected time calculator
Enter boats, sail numbers, and elapsed times to rank a full fleet by corrected time.
Pursuit race calculator
Calculate staggered start times for a pursuit race using national PY numbers.
Average lap racing
Scoring boats that sail different numbers of laps, and the Same PN adjustment.
Average lap calculator
Enter boats, lap counts, and elapsed times to rank a fleet with the Same PN adjustment.
Club adjustments
When and how to adjust national numbers or set your own.