Ocean Health Index

open-source tools and resources

for marine science and management

What is the OHI?

The Ocean Health Index ('OHI') is a way to measure how healthy oceans are. Understanding the state of our oceans is a first step towards ensuring they can continue providing humans benefits now and in the future.

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OHI Flower plot

What is OHI+?

Independent assessments at any scale.

OHI+ assessments use the OHI framework and are independently-led by anyone interested. OHI+ assessments are often conducted at smaller spatial scales with the purpose of informing marine policy.

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Where have assessments been done?

Assessments at the global scale have been completed each year from 2012-present. Assessments have also been completed or are underway at smaller scales within coastal countries or groups of countries around the world.

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How do I get started?

We provide free instruction and software so you can conduct your own OHI+ assessment. There are four phases to the assessment process: Learn, Plan, Conduct, and Inform.

Start your OHI+ assessment now


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