The Douglas Sea Scale was devised by the English Admiral H.P. Douglas in 1917, while he was head of the British Meteorological Navy Service. Its purpose is to estimate the sea's roughness for navigation. The Douglas Scale consists of two codes, one for estimating the state of the sea (fresh waves attributable to local wind conditions), the other for describing sea swell (large rolling waves attributable to previous or distant winds).
- Degree 0—no measurable wave height, calm sea
- Degree 1—waves >10 cm., rippled sea
- Degree 2—waves 10–50 cm., smooth sea
- Degree 3—waves 0.5–1.25 m., slight sea
- Degree 4—waves 1.25–2.5 m., moderate sea
- Degree 5—waves 2.5–4 m., rough sea
- Degree 6—waves 4–6 m., very rough sea
- Degree 7—waves 6–9 m., high sea
- Degree 8—waves 9–14 m., very high sea
- Degree 9—waves >14 m., phenomenal sea
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