AI
Context Window Calculator
See how much of a model's context window your text fills. Visualize usage instantly. Runs on your device — nothing is uploaded, nothing is stored.
GPT-4o — OpenAI
Token Count0 / 128,000
0.0% % Filled
0Token Count
128,000Context Window
0.0%Context Used
128,000Tokens Remaining
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About Context Window Calculator
Calculate how much of a model's context window your text uses. See tokens used, percentage filled, tokens remaining, and estimated API cost for major models.
Context Window Calculator is a free tool in the AI Tools category on BrowseryTools. It runs entirely in your browser — your data is never uploaded to a server, and there's no registration, no ads, and no watermarks, so your privacy is fully preserved.
Frequently asked questions