Unofficial calculator
Percent in. Human estimate out.
ChatGPT Limit Calculator
Estimate ChatGPT messages or Codex tasks from one OpenAI setup. Choose ChatGPT chat, Codex or Work, then select GPT-5.6 Sol or another available model.
Build your estimate
Pick a platform, match the window it shows, then read the likely range.
Your estimate
Around 36 ChatGPT messages left
Based on 65% remaining in the 5 hours window.
Remaining
65%
Used
35%
Likely range
25-46 ChatGPT messages
Estimate
36 ChatGPT messages
Safe pace
5-9 ChatGPT messages/hour
Typical API reference per task
$0.03-$0.21 (GPT-5.6 Sol)
You still have reasonable margin, but avoid wasting usage.
Main factors
ChatGPT uses its message window plus the selected model, reasoning level and feature. Higher effort settings can use more of the allowance.
Limit basis: ChatGPT chat uses the closest normalized message window. Codex, Work and workspace agents share an agentic usage and credit pool, with token-based model rates and optional Max or Ultra execution modes.
ChatGPT message access can use separate dynamic allowances for reasoning, tools and agent features, so this is a planning estimate rather than a cap.
GPT-5.6 Sol is rolling out gradually on eligible plans.
This tool is not affiliated with OpenAI, Anthropic, Google, Perplexity, Cursor, Windsurf or Devin. Results are unofficial estimates based on the remaining percentage and options you enter. Real limits can vary by plan, model, feature, system capacity, context length, files, task complexity and provider changes. API cost references are not subscription charges.
Popular setups
Jump straight to the estimate you need
These are the setups people most often compare when a provider shows a percentage instead of a simple count.
From Percent To Prompts
The calculator turns a vague remaining percentage into an easier estimate of prompts, messages, coding tasks or agent runs left.
Start With Percent Left
Use the remaining percentage your AI tool shows, not the percentage already used.
Match The Window
Choose the reset window, plan and platform so the estimate uses the closest preset.
Read Human Units
See estimated Codex tasks, ChatGPT messages, Claude messages or similar usage labels.
FAQ
Quick answers about how the estimator treats remaining percentage, reset windows and unofficial AI usage ranges.
Is the ChatGPT Plus number guaranteed?
No. The Plus number is a normalized planning reference, and access can differ by model, feature, capacity and the window shown in your account.
Does this support GPT-5.6?
Yes. GPT-5.6 Sol is shown for eligible ChatGPT plans, while Terra and Luna appear when Codex or Work is selected. Availability is still rolling out and limits can differ by product.
Does this calculate exact tokens?
No. It estimates prompts, tasks, messages or usage units from your remaining percentage.
Why is it approximate?
AI platforms use dynamic limits based on plan, model, system capacity, context, files and task complexity.
What does remaining percentage mean?
It is the percentage the platform shows as remaining, not the percentage already used.
Is this official?
No. It is an independent estimator.
Other calculators
This tool is not affiliated with OpenAI, Anthropic, Google, Perplexity, Cursor, Windsurf or Devin. Results are unofficial estimates based on the remaining percentage and options you enter. Real limits can vary by plan, model, feature, system capacity, context length, files, task complexity and provider changes. API cost references are not subscription charges.