License Calculator is a Chrome add-on developed by Sharmarke Samatar, designed to simplify the process of upgrading and downgrading license keys. This handy tool eliminates the need for manual calculations and provides a convenient way to manage license durations.

With License Calculator, you can effortlessly upgrade or downgrade license keys for various durations, including 1, 3, 7, and 10 years. The algorithm within the calculator takes care of all the necessary formulas, so all you need to do is input the creation date of the key, select the desired year, and choose the upgrade or downgrade option.

Whether you need to extend or shorten the duration of your license keys, License Calculator streamlines the process and saves you valuable time. This intuitive add-on is a must-have for anyone who frequently deals with license keys and wants to easily manage their validity.