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Calcimator

Tidal Range Predictor

Predict spring and neap tidal ranges from mean tidal range, lunar phase, and solar declination factor.

Inputs

ft
days

Results

Predicted Tidal Range

2.91 m

≈ 19 smartphones

Spring Tide Range2.91 m
Neap Tide Range1.94 m
High Water (above MSL)1.46 m
Low Water (below MSL)-1.45 m
Tide TypeSpring
How to Use This Calculator
  1. Enter Mean Tidal Range, Lunar Phase, and Solar Declination Factor.
  2. Review the Predicted Tidal Range (m) result.
  3. Use Spring Tide Range (m) and Neap Tide Range (m) to inform your decision.

How the result changes with Mean Tidal Range

Mean Tidal RangePredicted Tidal Range
2.092.43 m
7.068.22 m
1315.13 m
1820.95 m

What each input means

Mean Tidal Range
Average difference between high and low tide at your location in meters.
Lunar Phase
Day of the lunar cycle (0 = new moon, ~7 = first quarter, ~15 = full moon, ~22 = last quarter).
Solar Declination Factor
Relative solar declination (0 = equinox/minimal effect, 1 = solstice/maximum diurnal inequality).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Mean Tidal Range = 2.5, Lunar Phase = 0, Solar Declination Factor = 0.3 = 3 input(s) provided
  2. Calculate Predicted Tidal Range
    Predicted Tidal Range
    2.91 = 2.91
  3. Calculate Spring Tide Range
    Spring Tide Range
    2.91 = 2.91
  4. Calculate Neap Tide Range
    Neap Tide Range
    1.94 = 1.94

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