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How to calculate the combined sea and swell height
Use this table to calculate the combined sea and swell height.
SWELL HEIGHT (metres) | |||||||||||||
0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 | 6.0
| 7.0
| 8.0
| ||
WAVE HEIGHT (metres) | 0.5
|
0.5 |
0.7 |
1.1 |
1.6 |
2.1 |
2.6 |
3.0 |
4.0 |
5.0 |
6.0 |
7.0 |
8.0 |
1.0
|
1.0 |
1.2 |
1.4 |
1.8 |
2.2 |
2.7 |
3.2 |
4.1 |
5.1 |
6.1 |
7.1 |
8.1 | |
1.5
|
1.5 |
1.6 |
1.8 |
2.1 |
2.5 |
2.9 |
3.4 |
4.3 |
5.2 |
6.2 |
7.2 |
8.1 | |
2.0 |
2.0 |
2.1 |
2.2 |
2.5 |
2.8 |
3.2 |
3.6 |
4.5 |
5.4 |
6.3 |
7.3 |
8.2 | |
2.5 |
2.5 |
2.6 |
2.7 |
2.9 |
3.2 |
3.5 |
3.9 |
4.7 |
5.6 |
6.5 |
7.4 |
8.4 | |
3.0 |
3.0 |
3.0 |
3.2 |
3.4 |
3.6 |
3.9 |
4.2 |
5.0 |
5.8 |
6.7 |
7.6 |
8.5 | |
4.0 |
4.0 |
4.0 |
4.1 |
4.3 |
4.5 |
4.7 |
5.0 |
5.7 |
6.4 |
7.2 |
8.1 |
8.9 | |
5.0 |
5.0 |
5.0 |
5.1 |
5.2 |
5.4 |
5.6 |
5.8 |
6.4 |
7.1 |
7.8 |
8.6 |
9.4 | |
6.0 |
6.0 |
6.0 |
6.1 |
6.2 |
6.3 |
6.5 |
6.7 |
7.2 |
7.8 |
8.5 |
9.2 |
10.0 | |
7.0 |
7.0 |
7.0 |
7.1 |
7.2 |
7.3 |
7.4 |
7.6 |
8.1 |
8.6 |
9.2 |
9.9 |
10.6 | |
8.0 |
8.0 |
8.0 |
8.1 |
8.1 |
8.2 |
8.4 |
8.5 |
8.9 |
9.4 |
10.0 |
10.6 |
11.3 | |
9.0 |
9.0 |
9.0 |
9.1 |
9.1 |
9.2 |
9.3 |
9.5 |
9.8 |
10.3 |
10.8 |
11.4 |
12.0 | |
10.0 |
10.0 |
10.0 |
10.0 |
10.1 |
10.2 |
10.3 |
10.4 |
10.8 |
11.2 |
11.7 |
12.2 |
12.8 | |
About the calculation
The table above was calculated using the following formula.
Combined sea and swell height = [(Wind Wave Height)2 + (Swell Wave Height)2]1/2
About the values in this table
The Bureau provides forecasts of swell and sea to the nearest 0.5m. To be consistent with this precision, the total wave height values in the above table should be "rounded" to the nearest 0.5m.
Related Information
Marine service mini guides
Download PDFs.
(80-100K)
Safe boating & maritime distress
Australian marine safety agencies
- Australian Maritime Safety Authority (AMSA)
- Marine and Safety Tasmania
- Marine Safety Victoria
- Marine Group, Transport South Australia
- New South Wales Maritime Authority
- Northern Territory Department of Planning and Infrastructure
- Maritime Safety Queensland
- Western Australia Department of Planning and Infrastructure
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