Paste any text to instantly see token count, word count, and estimated API costs for GPT-4o, Claude 3.5 Sonnet, and Gemini 1.5 Pro.
* ~4 chars/token heuristic. Published API pricing per 1M tokens.
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What is a token? Tokens are the basic units AI language models use to process text. A token can be a word, part of a word, or a single character. On average, 1 token equals roughly 4 characters or 0.75 words in English.
Why do tokens matter? AI APIs charge based on token usage. Understanding your token count helps you estimate costs, stay within context window limits, and optimize prompts for efficiency.
Context windows explained: Each AI model has a maximum context window — the total tokens it can process per conversation. GPT-4o supports 128K tokens, Claude 3.5 Sonnet 200K, and Gemini 1.5 Pro leads with a massive 2M token window.
Reduce token usage: Be concise, avoid repetition, use bullet points, and leverage system prompts to set context once rather than repeating in every message.
See token, word, and character counts update instantly as you type or paste.
Compare estimated costs across 3 major AI models side by side.
Visual progress bars show how much of each model's context window you're using.
Everything you need to know about tokens, word counts, and AI API costs.
As a general rule of thumb for LLMs like OpenAI's ChatGPT or Claude, 1 token is approximately equal to 0.75 words (or 4 characters). Therefore, 500 tokens convert to roughly 375 words. This can vary slightly depending on the complexity of the text and the specific tokenizer used.
Following the standard AI tokenization metric (1 token ≈ 0.75 words), 1 million tokens translate to approximately 750,000 words. This is roughly equivalent to handling 15 complete novels or hundreds of long-form blog posts in a single context window.
A word to token calculator uses a dedicated tokenization algorithm (like Tiktoken for OpenAI models) to break down raw text strings into smaller chunks called tokens. Unlike standard word counters, it counts punctuation, spaces, and fragments of words as separate tokens, which helps developers accurately estimate API costs.
Yes, the Boostrix AI Token Calculator is 100% free and operates entirely inside your browser using Vanilla JS. We do not store your text or prompts on any server, ensuring complete privacy.