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


A quick look at the Ocean Health Index

The Ocean Health Index produced its first assessment of global ocean health in 2012. But how far have we come? Check out this factsheet to learn more about our progress and engagement since then:


How to build a successful OHI technical team

At the core of Ocean Health Index (OHI) assessments lie dozens of datasets and the technical teams to process them. Technical teams are tasked with collaboratively gathering and organizing datasets, preparing data in a standard format, and coding reproducibly to calculate OHI scores. Thus, building the correct technical team plays an instrumental role in the success of the assessment. So what skills should you consider when building your technical team?

Older posts View all OHI Science news