Find the low tide for the day. Tide data is found from several sources. Usually local stations with a weather program will have tidal data. In addition, NOAA keeps track of tidal data. For example, low tide at one beach was 1 foot.
Find the high tide for the day. Use the same source so you eliminate a chance of differing data sets. In our example, high tide was 3 feet.
Subtract the low tide from the high tide to determine tidal range. In this example, 3 feet minus 1 foot equals a tidal range of 2 feet.
