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Hindustan Calculator

About Hindustan Calculator

Hindustan Calculator is a free collection of calculators for the sums Indian families, students, builders and small businesses actually do, from kundli yogas and brass to CFT to SGPA, income tax and EMI.

Who builds Hindustan Calculator

Hindustan Calculator is created and maintained by Umer Sattar, a web developer who builds fast, practical tools and websites (umerkhanofficial.com). Every calculator, formula and page on the site goes through the same build-and-check process described below.

What makes these calculators different

  • Indian rules, not generic maths: brass and CFT, IS codes for bricks and steel, TNEA cut-offs, IGNOU's 30/70 weighting, CBSE's 9.5 rule, India's tax regimes.
  • Real calculations: the astrology tools compute actual planetary positions (Lahiri ayanamsa) instead of guessing from the date.
  • Formulas on the page: every tool shows its method and a worked example, so results can be checked by hand.
  • Private by design: everything runs in the browser; birth details, marks and salaries are never sent to a server or stored.

How each calculator is checked

  1. One clear source per rule: a standard (IS 1077, IS 456, IS 1239), a university regulation, a government notification or a classical text.
  2. Automated tests: for example, the astrology engine is tested against known Sankranti dates and planetary sign changes, and the tax engine against hand-worked cases.
  3. Worked examples: each guide's numbers are recalculated with the tool before publishing.
  4. Dated reviews: every page shows when it was last reviewed; rules that change (tax slabs, GST, railway booking rules) are re-checked when notifications change.

Corrections and suggestions

Found a number that doesn't match a marksheet, a panchang or an official notification? Send the page link and the expected value on WhatsApp or by email from the contact page. Corrections are checked against the source and fixed, and the page's review date is updated.

What Hindustan Calculator is not

It is not a substitute for a structural engineer, a chartered accountant, a SEBI-registered adviser or a qualified astrologer. The calculators help people understand and check numbers; important decisions deserve professional advice. Hindustan Calculator is independent and not affiliated with any company whose name appears in a calculator title, such as HT Media, Hindustan Unilever or Hindustan Copper.