About Rozna Calc

Rozna Calc is published by a small Hyderabad firm that runs several tool sites. This one collects the calculations that do not belong to any single topic: the ones you would otherwise do on a phone's calculator app and get wrong by a month or a decimal place.

Each page states its method and its edge cases (leap years, end-of-month dates, percentage points versus percent) so you can trust the result or catch the mistake.

Who runs it

Rozna Calc is published by ABSU Mobilities, a proprietorship of Sumaiya Fatima in Hyderabad, India. The same publisher runs the other ABSU sites. There is no company behind the name beyond that, and no investors.

How the tools are made

Each tool is a small program that runs in your browser. The formula is written out on the tool's page with a worked example, so you can check it by hand. Where a tool depends on a published rate, slab or table, the page names the source and the date we read it. When a source changes, the page is updated and the date moves.

Mistakes

If a result is wrong, or a source is out of date, write to support@abdulsfresh.in with the tool's name and the inputs you used. Corrections are made on the page, with the date.