State of Sea

Descriptive term	Height in Metres	Wind speed in knots (kmph)	Beaufort scale
Calm ( glassy)	0	0	0
Calm (rippled)	0 - 0.1	1 - 3 ( 2 - 6)	1
Smooth (waveless)	0.1 - 0.5	4 - 10 ( 7 - 19 )	2 - 3
Slight	0.5 - 1.25	11 - 16 (20 - 30 )	4
Moderate	1.25 - 2.5	17 - 21 ( 31 - 39)	5
Rough	2.5 - 4.0	22 - 27 (41 - 50)	6
Very rough	4.0 - 6.0	28 - 33 (52 - 61)	7
High	6.0 - 9.0	34 - 40 (63 - 74)	8
Very high	9.0 - 14.0	41 - 63 (76 - 117)	9 - 11
Phenomenal	Over 14	64 or above (119 or above)	12