Claude 5‑Hour Limit Calculator

Find when to activate your quota window early, so a refresh lands halfway through your real work session.

“Quota lasts” = how many hours of real work one period’s quota gives you before it runs out. Run out ~3h into a session? Enter 3.

How to use it

Enter your real working window and plan details. The calculator centers a quota refresh inside your session when one quota period is not enough. Early activation does not increase your plan’s quota; it lets your work span the quota before and after a scheduled refresh.

The 09:30 activation example

If your focused Codex or Claude Code work runs from 12:00 to 17:00, activate the five-hour window at 09:30 by sending a short message.

  1. 12:00–14:30: work with the first quota period.
  2. 14:30: the five-hour window refreshes.
  3. 14:30–17:00: continue with the second quota period.

Your five-hour work window is split evenly across two quota periods: 2.5 hours before the refresh and 2.5 hours after it.

FAQ

What is the Claude 5 hour limit?

Claude usage resets on a rolling 5-hour window. Each window gives you a fixed quota; when it runs out you wait for the next reset. This tool finds the best moment to start so a reset lands in the middle of your work session.

How does the calculator work?

You enter your real working window, the period length (5h), and how long one period's quota lasts you. When you need more than one quota period, it places a refresh at the midpoint of your work window so the work is shared evenly across the quota before and after the refresh.

Does this work for Cursor, Codex, or ChatGPT limits?

Yes. The math is the same for any rolling usage window — change the period length and quota to match your plan.