Ocean Health Index

open data science tools and resources

for marine science and management

What is the Ocean Health Index?

The Ocean Health Index ('OHI') is a scientific framework used 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.

Learn more Download data Visit our overview website oceanhealthindex.org
OHI Flower plot

Where have OHI assessments been done?

We've led global OHI assessments of 220 coastal nations and territories every year since 2012, and also lead OHI assessments at smaller scales.

Additionally, we share code and provide training and support for independent groups interested in leading their own OHI assessments. These are called independent OHI assessments, or 'OHI+ assessments'.

Learn more about OHI+ View all assessments View publications
OHI hex sticker

Open data science for marine science and management

The OHI is transforming the way marine science streamlines with coastal management by leveraging practices and tools from open science and data science. We work openly online and have shared our story in publications and blogs. We teach these practices and tools to groups leading OHI+ assessments.

Better science in less time

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


The OHI Toolbox is useful far beyond ocean management

We get asked a lot whether the OHI Toolbox can be used for other projects besides the Ocean Health Index (OHI). And the answer is yes, absolutely. This is because the software and workflow we built the Toolbox with are not unique to OHI: we did not develop them, we are simply using them for our project. It’s like how we use Gmail and Skype to effectively communicate within our team, but we did not develop these software programs.


The unseen data: A story of OHI intermediate data layers

When you first explore the Ocean Health Index (OHI), the thing that usually sticks most is the final score, a number ranging from 0-100. While there are a multitude of ways these scores can catalyze discussion and stakeholder engagement, another question is often what else can OHI be used for?

Older posts View all OHI Science news