Nuclear Information Project

The Nuclear Information Project provides the public with reliable information about the status and trends of the nuclear weapons arsenals of the world’s nuclear-armed countries.

The Project, called “one of the most widely sourced… for nuclear warhead counts” by the Washington Post, uses open sources such as official documents, testimonies, previously undisclosed information obtained through the Freedom of Information Act, as well as independent analysis of commercial satellite imagery as the basis for developing the best available unclassified estimates of the status and trends of nuclear weapons worldwide. 

The Project also conducts analysis of the role of nuclear weapons and provides recommendations for responsibly reducing the numbers and role of nuclear weapons.

The research is mainly published on the Strategic Security Blog, in the Nuclear Notebook in the Bulletin of the Atomic Scientists, the World Nuclear Forces overview in the SIPRI Yearbook, as well as in magazines. As a primary source for reliable information on nuclear weapons, the Project is a frequent advisor to governments, parliamentarians, the news media, institutes, and non-governmental organizations. 

The Nuclear Information Project is directed by Hans M. Kristensen in collaboration with Matt Korda (and previously Robert S. Norris). The Project also collaborates with other experts and organizations. The project is funded by the MacArthur Foundation, New Land Foundation, Ploughshares Fund, and Prospect Hill Foundation.

World Nuclear Forces

A quick overview with the most up-to-date information on the world’s nuclear weapons arsenals.

Strategic Security Blog

Read the latest stories and analyses of current nuclear weapons-related issues, from new discoveries to treaty retrospections.

Nuclear Notebook

Dive into the world-famous Nuclear Notebook series with detailed information about each nuclear armed state.


Looking for a project publication? See the chronology with links going back more than a decade.

In The News

Our research is used by others around the globe. Here’s just a glimpse of the news stories based on our research.

On Twitter

Follow Hans M. Kristensen and Matt Korda on Twitter for real-time analysis and more.

This work builds on the Nuclear Weapons Databook project that Thomas Cochran and Robert Norris managed at NRDC for many years. Many of their publications are available here at FAS via the Cochran Archive and the Norris Archive.

The Nuclear Information Project is currently supported by the Future of Life Institute, the John D. and Catherine T. MacArthur Foundation, Longview Philanthropy, the New Land Foundation, the Ploughshares Fund, and the Prospect Hill Foundation.