About Calc Tools Base

Calc Tools Base is a free library of 354 browser-based calculators and 1,000 calculation guides covering math, finance, health, construction, unit conversion, dates and Indian tax tools. Every calculation runs on your device — no signup, no uploads, nothing stored on a server. The site is built and maintained by Takenick Innovation.

Who edits this site

Portrait monogram of Uddhav Gopani Uddhav Gopani, Founder

Uddhav founded Calc Tools Base and edits everything on it. He designs the calculators, writes the guides, and checks each formula and worked example against primary sources before it ships. When a tax rule, threshold or guideline changes, the affected pages are re-reviewed and re-dated. His standing rule for the site: a number you cannot reproduce is a number we do not publish.

How pages are reviewed

Every guide states its method, inputs, assumptions and limits next to the calculation, and carries a visible review date. Sources for time-sensitive rules are official ones — the Income Tax Department, CBIC, EPFO, RBI, CDC, WHO and ACOG among them. Where a figure changes (tax slabs, provident-fund rates, GST structure), the page says which period it covers. Mistakes still happen; readers can report them and the correction ships with the next review.

How the site pays for itself

The site is monetised with Google AdSense (publisher ID ca-pub-6107920752857014). Ads never sit inside calculator results, and no advertiser influences the numbers. Details are in the Privacy Policy and Cookie Policy.

Corrections and contact

Spot a wrong formula, a stale rate or a broken tool? Email takenickinnovation@gmail.com — corrections are reviewed before anything else in the queue. You can also use the contact page.

Legal

Page reviewed 25 September 2026.