Worldwide Tide Times
Free tide times, tide charts and tidal coefficients for over 3,500 ports in 112 countries. Accurate predictions powered by FES2022 harmonic analysis.
Top countries
Why TidesAtlas?
Accurate tide predictions
Precise tide times and heights for up to 10 days, powered by the FES2022 harmonic model.
Worldwide coverage
Over 3,500 tide stations across 112 countries, from major ports to remote coastlines.
Complementary data
Sunrise and sunset times, moon phases, and official tidal coefficients for France.
All countries
Europe
North America
Africa
Asia
Oceania
About our data
TidesAtlas uses the TICON-4 prediction engine based on FES2022 harmonic constituents, one of the most accurate global tidal models available. Our data is derived from thousands of tide gauge stations worldwide, maintained by national hydrographic offices. Tidal coefficients for France are sourced from the official SHOM (Service Hydrographique et Océanographique de la Marine) data. All predictions are updated daily and provided under a Creative Commons CC BY 4.0 license.
TICON-4 Prediction Engine
Our tide predictions are computed using TICON-4, a harmonic prediction engine that processes FES2022 tidal constituents. FES2022 is developed by LEGOS/CNES (French National Centre for Space Studies) and is one of the most accurate global ocean tide models, validated against satellite altimetry and in-situ measurements.
Verified data sources
Tide gauge data is sourced from national hydrographic offices worldwide: SHOM (France), NOAA (United States), UKHO (United Kingdom), BOM (Australia), CHS (Canada), and many others. Each station provides harmonic constants calibrated from years of continuous measurements.
Daily updates
Predictions are regenerated daily to ensure accuracy. For French ports, official SHOM tidal coefficients are integrated, providing the reference standard used by maritime authorities, fishermen, and coastal professionals.
Frequently asked questions
What are tides?
Tides are the periodic rise and fall of sea levels caused by the gravitational forces of the Moon and Sun, combined with the rotation of the Earth. They follow predictable cycles that can be calculated years in advance using harmonic analysis.
How often do tides occur?
Most coastal locations experience two high tides and two low tides each day (semidiurnal tides), approximately every 12 hours and 25 minutes. Some locations have only one tidal cycle per day (diurnal tides) or mixed patterns.
What is a tidal coefficient?
A tidal coefficient is a dimensionless number (typically 20 to 120) that indicates the amplitude of a tide relative to the average. Higher coefficients mean greater tidal range (spring tides), while lower coefficients indicate smaller tidal range (neap tides). Coefficients above 100 indicate exceptional tides.
How accurate are tide predictions?
Our predictions use the FES2022 harmonic model with data from thousands of tidal stations worldwide. Accuracy is typically within 10-15 cm for height and 5-10 minutes for timing. Local weather conditions (wind, atmospheric pressure) can cause temporary deviations from predicted values.