Use this sailing calculation for planning or education when the vessel, units, reference directions, environmental conditions, and assumptions are explicitly known.

Elapsed time (s)

Required number in s. Elapsed time from start to finish.

PHRF rating (s/NM)

Required number in s/NM. PHRF rating in seconds per nautical mile; fast boats may have negative ratings.

Course distance (NM)

Required number in NM. Course length sailed.

The cited overview of Handicap (sailing) supplies background for the terminology and domain context used by this tool.^[1]

Compute a PHRF time-on-distance corrected time by subtracting the rating allowance over the course length from elapsed time. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Corrected time (s)

Returned number in s. Corrected time after subtracting the rating allowance.

• Vessel design and loading, sea state, wind, current, tide datum, weather, chart accuracy, equipment, crew, and safety margins can make real conditions differ from a simplified result.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Cross-check current charts, tide and weather services, instrument data, vessel manuals, and applicable navigation rules, and retain a conservative alternative plan.

• PHRF Time on Time Calculator

  Compute a PHRF time-on-time corrected time by scaling elapsed time with the coefficient six hundred fifty over five hundred twenty plus rating.

• IRC Corrected Time Calculator

  Compute IRC corrected time by multiplying elapsed time by the boat's published time correction coefficient (TCC).

• ORC Corrected Time Calculator

  Compute ORC time-on-time corrected time by multiplying elapsed seconds by the supplied Time Correction Coefficient (TCC).