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GPT Token Counter

GPT-3.5 / GPT-4 token estimate (heuristic ≈ 4 chars/token).

⚠ Local-only — does not call any AI model.

How to use GPT Token Counter

  1. Paste the text you plan to send to a GPT model.
  2. The tool estimates the token count using a character-based heuristic (roughly 4 characters per token for English text).
  3. Use this to gauge whether your prompt fits within a model's context window or to estimate API cost before sending.

Limitations

  • This is a heuristic estimate, not the exact tokenizer OpenAI's API uses internally — actual token counts can differ by a small margin, especially for non-English text, code, or unusual punctuation. For billing-critical precision, use OpenAI's official tiktoken library.

About this tool

GPT Token Counter is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.

Category: AI Utilities. Browse more AI Utilities tools.