AI Token Counter
Count Tokens
Estimate token count for your text
API Cost from Text
Estimate API cost based on your text length
words
calls
Formula
Estimated Tokens = Words × 1.3 (approximate average across models)
Frequently Asked Questions
How accurate is the token estimate?
The 1.3 tokens-per-word ratio is an average estimate. Actual tokenization varies. For exact counts, use the official token counters: OpenAI Tokenizer for GPT models, or Claude's token counter for Anthropic models.
Why do different models have different token counts?
Different models use different tokenization algorithms. GPT-4 and GPT-3.5 share the same tokenizer. Claude uses its own tokenizer. Gemini uses a different approach. These differences can result in 2-5% variations.
Should I count the system prompt?
Yes, always count tokens in system prompts. They are part of the input tokens and affect your API bill. For long system prompts, consider storing them efficiently.
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