Most calculator websites bury a simple tool under ads, pop-ups, and a wall of forty unrelated links. This site exists to do the opposite: a small, focused set of calculators and converters that load fast, work correctly, and get out of your way once you have your answer.
Every calculator here runs entirely in your browser — your numbers are never sent to a server to compute a result, and nothing you type is logged or stored anywhere except, for a few tools, locally in your own browser so your preferences (like your usual tip percentage) are remembered the next time you visit. See our Privacy Policy for the full detail on what is and isn't collected.
Formulas are built to standard, well-established methods (for example, WHO body mass index categories, or standard mortgage amortization math) — but every tool is a general-purpose estimate, not a substitute for professional advice specific to your situation. Where that matters most — health and financial tools — you'll find a note on the page itself.
This site is built and maintained independently by a solo developer, not a company or agency. It's a small, focused project — if you spot something wrong with a calculation or have a tool you'd like to see added, get in touch. Every message is read.
This site is free to use and supported by advertising. Ads help cover hosting costs and the time spent building and maintaining these tools, so you don't have to pay or sign up for anything. See our Privacy Policy for details on how ad partners use cookies.