Use this sailing calculation as a planning or educational cross-check for navigation, wind and current, rig loads, stability, anchoring, tides, visibility, performance, or recovery under explicitly stated conditions.

Elapsed time (s)

Time on course from start signal to finish.

Time correction factor

IRC rating expressed as a time correction factor between zero point eight and one point three.

Compute IRC corrected time by multiplying elapsed time by the boat's published time correction coefficient (TCC). The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Corrected time (s)

Corrected finish time used to score the race.

• Actual conditions change with vessel design and loading, sea state, wind, current, tide datum, weather, chart accuracy, equipment, crew, regulations, and safety margins. Simplified formulas do not replace seamanship, approved stability data, or current navigation information.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Cross-check official charts, tide and weather services, instrument data, vessel manuals, and collision regulations; maintain conservative margins and a safe alternative plan.

• ORC Corrected Time Calculator

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

• 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.

• PHRF Time on Distance Calculator

  Compute a PHRF time-on-distance corrected time by subtracting the rating allowance over the course length from elapsed time.