Check GPT input length
Measure text under the selected GPT encoding alongside character and UTF-8 byte counts.
GPT Token Count and Cost Calculator
GPT Token Count and Cost Calculator
Use an o200k_base or cl100k_base encoder to count tokens, characters, words, and bytes and estimate cost from an input-token price.
Key features
- Switches between o200k_base for GPT-4o-family models and cl100k_base for GPT-4-family models
- Counts tokens, characters, whitespace-delimited words, and UTF-8 bytes as you type
- Estimates cost from a user-supplied USD price per one million input tokens
- Loads only the selected GPT encoder module when needed
How to use
- Choose the relevant GPT encoding family and enter your text.
- Review token and supporting counts, then adjust the input price if needed.
Examples
Estimate input cost from your own rate
Enter an input-token rate from your plan or documentation for a simple estimate.
Privacy
Text and token calculations stay in your browser and are not sent to the OpenAI API for counting. The selected encoder code is loaded on demand as a QuickKit site asset.
Requirements
The estimate applies only the input-token price you provide. It does not include chat-format overhead or tokenization used by other model families such as Claude or Gemini.
Common questions
- Is the displayed cost an actual API charge?
- No. It only multiplies the text's token count by the USD input price per million tokens that you enter. Output tokens, request-format overhead, and actual billing rules are excluded.
- Does this count Claude or Gemini tokens too?
- No. It uses only the selected GPT-family o200k_base or cl100k_base encoding. Other model families can produce different counts.
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