AI Token Calculator

Free token calculator for GPT, Claude and Gemini models.

AI Token Calculator for GPT, Claude and Gemini

This AI token calculator helps developers estimate token usage for modern AI models such as OpenAI GPT models, Anthropic Claude models and Google Gemini models.

Understanding token usage is important because most AI APIs charge based on tokens processed.

What is an AI Token?

A token is a unit of text processed by an AI language model. Instead of reading full words or sentences, models like GPT-4o, Claude 3 or Gemini 1.5 process text as tokens.

Sentence: AI tools are powerful
Words: 4
Characters: 21
Tokens: ~6

Why Use a Token Calculator?

Estimate AI API costs
Optimize prompts
Understand context window limits
Reduce token usage

Frequently Asked Questions

What is a token in AI?

A token is a piece of text processed by AI models like GPT, Claude and Gemini.

How many characters equal one token?

In English text one token is roughly four characters, but this varies depending on punctuation and language.

Why do AI APIs charge by tokens?

Token usage reflects the computational resources required to process prompts and generate responses.

Does this calculator support Gemini?

Yes. This tool estimates token usage for GPT, Claude and Gemini models.