AI Token Counter
Paste text to estimate token counts and API costs for popular AI models.
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Characters
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Words
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Lines
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Sentences
Token Estimates
GPT-4 / GPT-4o
0
~4 chars/token
Claude
0
~3.5 chars/token
Llama
0
~3.8 chars/token
Cost Estimates (Input)
| Model | Est. Tokens | Price/1M | Cost |
|---|
What are AI Tokens?
Tokens are the basic units that AI language models use to process text. A token can be a word, part of a word, or even a single character. On average, 1 token is roughly 4 characters for English text, though this varies by model and language.
Why Count Tokens?
- AI APIs charge per token — knowing your token count helps estimate costs
- Models have context window limits (e.g., 128K tokens for GPT-4o, 200K for Claude)
- Optimizing prompt length saves money and improves response times
- This tool gives estimates — exact counts depend on each model's tokenizer