About Arogun

Arogun is dedicated to providing free, high-utility calculators to professionals, freelancers, small business owners, and individuals who want accurate answers without paywalls or unnecessary complexity. Everyone deserves access to the same tools that accountants, financial planners, and nutritionists use without paying for them.

The mission is straightforward: give you the exact number you need , show you where it comes from, and help you understand what to do with it.

Each calculator follows the same three-step principle: you enter only the numbers that actually matter, you get a result instantly in your browser, and you leave with enough context to act on it. A number without explanation is just a number. Every tool page includes the formula used, what the result means, and what to do next.

Core calculations run in your browser for speed and privacy. We use limited, anonymized analytics for security and product improvement, as described in our Privacy Policy.

My name is Osman Rahimi. I'm a software engineer, entrepreneur, and lifelong athlete, and I created Arogun out of a very personal need.

Whether I'm managing money or training, I've always wanted to understand the data down to the last detail. I quickly realized that most online calculators—whether for calculating taxes or estimating your TDEE (Total Daily Energy Expenditure)—are either incomplete, hidden behind paywalls, or based on formulas you can't verify. That didn't work for me. I like to check every number myself.

To truly understand financial systems, I sat down with a tax advisor, built my own templates from scratch, and eventually helped others optimize their filings too. To optimize my fitness, I dove straight into metabolic mathematics. I took that knowledge, built my own tracking templates, and realized that most people don't struggle with the math—they struggle with tools that hide the logic behind the results.

Arogun is my answer to that problem. Every calculator on this site is built the way I wish online tools worked: clear formulas, real explanations, no accounts, and complete transparency. These are the exact same tools I use daily to manage my finances and track my fitness parameters. My goal is simple: give you free, accurate tools to make confident, informed decisions—and whenever possible, I cite the exact formulas and sources so you can fact-check the results yourself.