Compute USPTO trademark filing fees and every statutory window by exact calendar math.
Trademark prosecution runs on a chain of statutory windows - opposition, Statement of Use, Section 8 and combined 8/9 maintenance - and a single missed date can abandon a registration.
A deterministic, client-side calculator multiplies per-class fees and computes every statutory window by exact UTC calendar arithmetic, citing the controlling statute and rule, with nothing uploaded.
Run the trademark timeline in your browser and route the cited dates into a Sandbox set or a Worklog case. Nothing about the mark is uploaded to anyone's cloud.