Free online calculators & AI tools. The math is right there on the page.

RabixAI is a collection of free calculators and converters built and reviewed by Anas Rabja. Every tool follows the same rule: show the formula, show a worked example, and let you check the result by hand. When the mortgage calculator says your monthly payment is $1,517, the amortization formula sits right below the result along with the arithmetic that produced it. If you disagree with a number, you can trace exactly where it came from.

Nothing here is a black box and nothing phones home. Each calculator runs entirely in your browser, so the loan amounts, body measurements and salaries you type never reach a server. There are no accounts, no paywalls and no locked features. A small number of clearly labelled ads keep every tool free.

Behind the tools sits a growing library of guides and original research that explains the concepts the calculators automate: how amortization actually works, what a healthy BMI range means at your height, when compounding starts to matter. Our minimum payment study simulated payoff month by month across a range of balances and rates rather than quoting someone else's figures, and it publishes the method so you can reproduce it.

Results from these tools are general information, not professional advice. Loan terms, tax rules and health targets vary by situation, and every result card carries the caveat that applies to it. When we find an error we fix it and say so. If you spot one first, tell us. The full process, from where the formulas come from to how corrections work, is on the methodology page.