Free online calculators
Practical calculators for planning work before you commit. The first tool estimates LLM API spend from a prompt; more everyday calculators will land here over time.
Why show the working
A single dollar figure without inputs is impossible to check. Every calculator here surfaces the assumptions it used — token estimates, cache settings, volume — so you can confirm it answered the question you actually asked before you paste a number into a budget or a ticket.
LLM pricing moves often. Prefer tools that show a pricing-reviewed date and let you override token counts from an official tokenizer when an invoice depends on it.