Token EstimatorWhere to start
Read what a token is first. Then read why counts differ between models, which explains why every number on this site is a range. The cost and context window pages show the arithmetic you need to plan a project.
This is an independent guide. It is not connected with Google, Anthropic, OpenAI or any company named here. Facts were read on 14 November 2026 from the pages named on each page. The numbers are estimates from rules of thumb, not the counts of any maker's tokenizer.