Look up your Member Number

Use our online lookup tool to find your ACS member number. You can also find your member number on your membership card and on the mailing label of your copy of C&EN. 

Renew your ACS Membership

If it is time for you to renew, your renewal will appear for payment. You can make changes or updates, and then pay by credit card.

Join ACS

New Ways to Join ACS. Explore benefits and find the membership package that’s right for you.