About CalciTools

How we build our calculators

Every calculator is built around a standard, established formula — the same math used by banks, textbooks, and professional references. We don't invent methods. Where a calculation has a widely accepted convention (for example, standard amortization for loans, or PITI for mortgages), we follow it, and we state the formula on the page so you can check our working.

How we verify accuracy

Before a tool goes live, its math is tested against hand-computed and reference examples. Financial tools are checked against known worked examples; scientific and health tools against their source formulas. Each calculator page includes a worked example and the underlying formula so you can confirm the result yourself. If you ever spot a discrepancy, we want to hear about it — see our contact page.

How we keep tools current

Calculators that depend on changing figures — tax brackets, contribution limits, typical interest rates — are reviewed and updated when those figures change. Pages show when they were last updated.

Who runs CalciTools

CalciTools is an independent site. It is not affiliated with any government agency, bank, lender, insurer or tax-software company. The calculators and guides are built, tested and maintained by Sunil Arora, a technical and data architect who works in the IT industry, using the published sources cited on each page. Read the full methodology, editorial standards and corrections log.

Contact

Questions, corrections or partnership requests: email contact@calcitools.com or use the contact page.

Important note

CalciTools provides educational tools and information, not professional financial, medical, legal, or tax advice. For decisions that matter, please confirm results with a qualified professional.