MathBehind is a free collection of calculators built to help developers, AI engineers and businesses estimate the costs and technical requirements of building AI-powered applications. Its tools cover everything from calculating OpenAI, Claude and Gemini API costs to estimating LLM context windows, AI agent expenses, fine-tuning budgets and GPU memory requirements. Users simply select a calculator, enter details such as token usage, model pricing or expected request volumes, and get instant results with clear formulas and step-by-step breakdowns.
MathBehind’s calculators make it easier to plan AI projects, compare infrastructure options and manage API spending before deployment. All calculators are free to use, require no sign-up and run directly in the browser, so entered data stays private.
