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Sailing Race Corrected Time Calculator

Turn a boat's elapsed time into its corrected time under PHRF time-on-distance or a Portsmouth Yardstick number.

PHRF is time on distance; Portsmouth is time on time
m:ss or h:mm:ss — e.g. 45:30, 1:02:03.4
seconds per nautical mile; negative ratings are faster boats
nautical miles; PHRF only
Enter elapsed time and a rating to see the corrected time.

Under PHRF time-on-distance the corrected time is the elapsed time minus the rating multiplied by the course distance, so a 120 s/nm boat over 10 nm is credited 20:00.0. Under the Portsmouth Yardstick the corrected time is the elapsed time multiplied by 1000 and divided by the boat's number, so 1:00:00 at 950 corrects to 1:03:09.5 and at 1250 to 0:48:00.0. The time allowance is the corrected time subtracted from the elapsed time: positive means the boat is credited time on handicap, negative means it gives time away. Corrected and elapsed pace are per nautical mile, and speeds are the distance divided by the time in hours. Ratings are looked up for your class and are not computed here; the course distance is the rated distance, not a GPS track, and current, wind, start penalties, protests and rating appeals are not modelled. Everything runs in your browser with no storage, uploads or network access.