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What this tool does
In a handicap race, the first boat across the line does not always win. Slower-rated boats get time back, and the winner is decided on corrected time, not elapsed time. This sailing race handicap time corrector takes an elapsed time and a PHRF rating and works out the corrected time under the two classic systems: time-on-time and time-on-distance. Both formulas are stated in full below, so you can check the tool’s answer by hand and understand exactly what it did.
PHRF ratings are given in seconds per nautical mile. A lower number means a faster boat. A boat rated 60 owes time to a boat rated 150, because the faster boat is expected to cover each mile sooner. The correction systems turn that expectation into a fair comparison. Time-on-time scales the whole elapsed time by a factor. Time-on-distance subtracts a fixed allowance per mile sailed. They usually agree closely on short races and drift apart on long ones, which is why race committees pick one system for an event and stick to it.
How to use it
Enter the elapsed time in seconds. If you timed the race as hours, minutes and seconds, convert it first: multiply hours by 3,600, minutes by 60, and add the seconds. Then enter the boat’s PHRF rating, in seconds per nautical mile, exactly as your fleet or club lists it. For the time-on-distance result, also enter the race distance in nautical miles. Press the button and you get the time correction factor plus both corrected times.
Compare boats by their corrected times under the same system. The smallest corrected time wins. Do not mix systems: a time-on-time result for one boat cannot be compared with a time-on-distance result for another. If your race used one system, use that column only, and ignore the other one. The tool shows both so you can learn the difference and double-check a race committee’s maths.
The formulas, stated plainly
Time-on-time uses a time correction factor, usually written TCF. The common PHRF formula is TCF equals 650 divided by 550 plus the PHRF rating. Corrected time equals elapsed time multiplied by TCF. A boat rated 100 has a TCF of exactly 1.0, so its corrected time equals its elapsed time. A slower boat rated 200 has a TCF of 650 divided by 750, which is about 0.867, so its corrected time shrinks. A faster boat rated 0 has a TCF of about 1.182, so its corrected time grows.
Time-on-distance is simpler. Corrected time equals elapsed time minus the PHRF rating multiplied by the race distance in nautical miles. A boat rated 120 sailing a 10-mile race gets 1,200 seconds taken off its elapsed time. That is the whole correction. The system is easy to explain at a prizegiving, but it assumes the rating holds equally well at every wind speed, which is not quite true in very light or very heavy air. Time-on-time handles changing conditions a little better, because the correction scales with how long the race actually took.
A worked example
Suppose a boat finishes in 3,600 seconds, exactly one hour, with a PHRF rating of 120, on a 10-mile course. Its time correction factor is 650 divided by 670, which is about 0.970. Its time-on-time corrected time is 3,600 times 0.970, about 3,492 seconds. Its time-on-distance corrected time is 3,600 minus 120 times 10, which is 3,600 minus 1,200, or 2,400 seconds. The two systems give very different numbers here, and that is normal: they are different scales, and only comparisons within one system mean anything.
Now compare with a faster boat rated 30 that finished in 3,300 seconds on the same course. Time-on-time gives it a factor of 650 divided by 580, about 1.121, and a corrected time of about 3,699 seconds, so it loses to the first boat under time-on-time. Time-on-distance gives it 3,300 minus 300, or 3,000 seconds, so it loses under that system too, but by a different margin. The winner is the same in this case, though the margin is not, and on other days the two systems can genuinely disagree about who won.
Limits and safety
This tool corrects times under the standard PHRF formulas. It does not know your club’s local adjustments, wind-dependent factors, or any other rating system such as ORC or IRC, which use completely different maths and measured data. Always use the system and the rating your race committee published for that event. If your club uses a different time-on-time constant, for example 600 instead of 650, the factor will differ, and the official result is the one that counts.
This is an educational estimator for learning and checking results. It is not an official race result, and it does not replace the race committee, the sailing instructions, or the rating authority. Protests and scoring questions go to the race committee, not to a calculator. Use the tool to understand your result, to settle a friendly argument, or to teach new racers how handicap scoring works.
Common questions
Why is my corrected time longer than my elapsed time? Because your rating is below 100, so your boat is rated fast and the system adds time back. That is the system working as designed, not an error. Why do the two systems disagree? Because one scales with time and the other scales with distance. On a slow, light-wind day, time-on-time gives slower boats a bigger allowance, because the race took longer. On a quick day, the difference shrinks.
Versión en español: Corrector de Tiempo Compensado en Regatas