What is an AI token?
Tokens are the small units AI models read and generate. A token can be a character, a short word, part of a longer word, punctuation, or whitespace. API providers meter tokens because token volume is a closer proxy for model work.
How this estimate works
This calculator uses a practical rule of thumb: CJK text is about 1 token per character, while other text is about 1 token per 4 characters. It is useful for budgeting and quick comparisons, but it does not replace provider tokenizers.
Planning example
A 4,000-character English support article may be about 1,000 tokens. If your app sends it with every request and generates a 300-token answer, each request may use about 1,300 tokens.
Input tokens and output tokens
Input tokens include instructions, chat history, retrieved documents, and user messages. Output tokens are generated by the model and are often priced higher. Shorter responses can improve both UX and margin.
Token budgeting example for a SaaS feature
Suppose a support assistant sends a 900-token system prompt, 1,200 tokens of retrieved documentation, and a 300-token user question. Before the model answers, the request is already about 2,400 input tokens. If the model returns 500 output tokens and the workflow runs 20,000 times per month, small prompt changes can become a real budget item.
Formula used for rough planning
Estimated tokens are calculated locally. CJK characters are counted close to one token each, and other text is estimated at about one token per four characters. This is intentionally simple so founders can make quick budget decisions before using provider-specific tokenizers.
How to use this before launch
Paste real prompts, retrieved snippets, onboarding messages, or customer support examples. Save typical low, medium, and high token counts, then use those ranges in the API Cost Calculator and AI Budget Planner instead of relying on a single best-case prompt.
Frequently asked questions
How accurate is this AI token calculator?
It is a planning estimate that runs locally in your browser. It uses practical token ratios and is useful for budgeting, but exact counts can differ from each provider's official tokenizer.
Does the calculator send my text to an AI provider?
No. The free calculator estimates tokens locally and does not call OpenAI, Anthropic, Google, DeepSeek, xAI, or any other model provider.
How many tokens are in 1,000 words?
For English text, 1,000 words often falls around 1,300 to 1,800 tokens depending on wording, punctuation, and formatting. Use the calculator for a closer estimate.
Turn tokens into cost.
Use the estimate in the full API cost calculator.