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Calcimator

Tide Height Calculator

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

Inputs

ft
ft
hrs
hrs

Results

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

Current Tide Height

5.15 ft

How to Use This Calculator
  1. Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
  2. High Tide Height — Height of the last or next high tide in feet above chart datum. Accepts values from 0 ft to 50 ft (default: 8 ft).
  3. Low Tide Height — Height of the last or next low tide in feet above chart datum. Accepts values from -5 ft to 40 ft (default: 2 ft).
  4. Hours Since High Tide — Number of hours elapsed since the last high tide. Accepts values from 0 hrs to 25 hrs (default: 3 hrs).
  5. Tidal Period — Full tidal cycle period in hours (12.42 for typical semidiurnal tide). Accepts values from 6 hrs to 25 hrs (default: 12.42 hrs).
  6. Once all inputs are set, review your results in the Results panel. Here's what each output means:
  7. Current Tide Height — shown as a numeric value. This is the primary result of this calculator.
  8. Tide Range — shown as a numeric value.
  9. Next High Tide In — shown as a numeric value.
  10. Next Low Tide In — shown as a numeric value.
  11. Current Rate of Change — shown as a numeric value.
  12. Tide Falling (1=yes, 0=no) — shown as a numeric value.
  13. Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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