AI Token Counter
Estimate token count and API costs for GPT-4, Claude, and Gemini models.
Token Estimate
Cost Estimator
| Model | Input Cost | Est. Input $ | Context Limit |
|---|
* Token count is estimated (~4 chars/token for English). Actual tokenization may vary. Prices approximate as of 2025.
About AI Token Counter
Large language models process text as tokens — roughly 4 characters or ¾ of a word on average. API pricing is based on token count, so estimating tokens helps you plan costs before making API calls. This tool estimates tokens using a character-based heuristic compatible with GPT, Claude, and Gemini models.
Frequently Asked Questions
What is a token?
A token is a chunk of text used by AI language models. For English text, 1 token is roughly 4 characters or ¾ of a word. Common words like "the" or "is" are single tokens, while longer words may be split into multiple tokens.
How accurate is this counter?
This tool uses a heuristic (~4 characters per token) which gives a close estimate for English text. For exact counts, use OpenAI's tiktoken library or Anthropic's official tokenizer. The estimate is typically within 5-10% of the actual count.
Why do tokens matter?
AI API providers charge per token. Knowing your token count helps you estimate costs, stay within context window limits, and optimize prompts for efficiency.