Tide Height Calculator

Estimate the current tide height using the Rule of Twelfths, plus time to next high and low tide.

High Tide Height

Low Tide Height

Hours Since High Tide

hrs

Tidal Period

hrs

Tab to move between fields

Current Tide Height

5.15 ft

Tide Range6 ft

Next High Tide In9.42 hrs

Next Low Tide In3.21 hrs

Current Rate of Change1.45 ft/hr

Tide Falling (1=yes, 0=no)1

How to Use This Calculator

Look up today's high tide height and low tide height in feet from a tide chart or app.
Enter the hours elapsed since the last high tide.
Leave the tidal period at 12.42 hours for standard semidiurnal tides, or adjust for your location.
Read the current tide height using the Rule of Twelfths calculation.
Check the time to next high and low tide to plan passages over shallow bars or inlets.

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