What we do
pakmath.com offers free unit converters, everyday calculators and plain-English maths guides for readers in the US, UK, Canada, the Netherlands, Pakistan and beyond. Every tool shows its formula, a worked example and its source, because a number you cannot check is a number you cannot trust.
Who is behind the site
pakmath.com is run by Dr. Muhammad Amjad Khadim, who holds a PhD in Mathematics. He writes and reviews the site's guides, checks every conversion factor and formula against published standards, and fact-checks guest articles before they are published. His academic publications are listed on his Google Scholar profile.
The site also runs the PAKMATH YouTube channel, which explains maths topics step by step.
How we keep the tools accurate
- Conversion factors come from primary sources such as NIST Special Publication 811 and the BIPM SI Brochure.
- Tax rates (VAT, GST/HST, sales tax) are checked against HMRC, the Belastingdienst, the Canada Revenue Agency and state tax authorities, and dated on each page.
- Health calculators follow NHS, CDC, WHO and NICE guidance and carry a medical note.
- Every calculator is tested against independently computed reference values before release.
Read our full editorial policy for how content is written, reviewed and corrected.
Get in touch
Found a mistake or have a suggestion? Contact us. Want to contribute an article? See Write for us.