Claude tokenizer
Claude Tokenizer & Cost Estimator
Estimate Claude prompt tokens, cache pricing impact, per-request cost, and monthly Anthropic API spend before sending production traffic.
Estimate Claude tokens and cost
Prompt size planning
Estimate the rough size of prompts, system instructions, documents, and tool descriptions.
Model cache behavior
Compare standard input, cache reads, and cache writes when prompts repeat.
Plan request volume
Translate prompt size and expected output length into monthly Claude API spend.
How this Claude token estimate works
The calculator estimates token count from character length, word-like segments, punctuation, and CJK characters. It then applies the selected Claude model's input, output, or prompt-cache price.
Use this for early budgeting. For provider-side preflight counts, use Anthropic's Count Tokens API because real Claude messages can include structure, images, documents, tools, and other request content.
| Question | Best next step | Related page |
|---|---|---|
| Do I need a provider-side Claude token count? | Use Anthropic's Count Tokens API before sending the message. | Claude token counting docs |
| How does Claude compare with OpenAI? | Estimate the same prompt in the OpenAI token calculator. | OpenAI Token Calculator |
| How much will repeated prompts cost? | Use token counts, cache hit rate, and request volume. | Claude Token Cost Calculator |
FAQ
Is this an official Claude tokenizer?
No. It is a local estimator. Anthropic's official Count Tokens API is the right source for preflight counts before an API request.
Why include prompt caching?
Claude prompt caching can materially change input cost when long system prompts, tool definitions, or documents are reused across requests.
References
Claude prices in this site were last checked on 2026-07-02. Verify current pricing and token counting against official Anthropic docs before production budgeting.