CalcHub is a free collection of 160+ calculators and converters covering finance, health, math, everyday conversions, and more. The goal is simple: give people a fast, accurate tool for a specific calculation without a sign-up, an account, or unnecessary friction. Open the page, enter your numbers, get an answer.
Every calculation runs directly in your browser. Nothing you type is sent to a server or stored anywhere.
CalcHub is built and maintained by Hadeed Ahmed Awan, a Karachi-based publishing and content specialist with a long-standing interest in building useful, straightforward tools for everyday problems.
Every formula on this site follows standard, publicly documented methodology — the same amortization formula lenders use for mortgages and loans, the Mifflin-St Jeor equation for calorie estimates, the Devine formula for ideal body weight, current IRS tax brackets for income tax estimates, and so on. Each calculator's worked example is checked against its own underlying formula before publishing, so the numbers shown as examples genuinely match what the tool itself calculates.
That said, this is one person building and checking a growing set of tools, not a team of licensed professionals reviewing every page. Where a calculator touches something with real financial or health consequences, the page says so directly, and you should treat the result as a starting estimate to verify with a qualified professional, not a final answer.
The site is actively maintained, and new calculators are added over time based on what people are searching for and asking about. If you have a suggestion, a correction, or found something that isn't working right, the contact page has the details.