About Finance Calculator X

What this site is

Finance Calculator X is a collection of financial calculators for the money decisions most people actually face: taking a loan, buying a home, saving toward a goal, investing regularly, and paying off debt. Each calculator is built as a complete decision-support tool — a clear primary answer, the supporting numbers behind it, an interactive chart, a full exportable schedule, and a plain-English explanation of the mathematics, its assumptions and its limits.

The site is free, requires no account, and runs every calculation directly in your browser. Your financial inputs are never sent to a server.

Who runs it

Finance Calculator X is an independent project built and maintained by Avinash Verma, a software developer based in Gurgaon, India, who builds focused web tools. It is not owned by, affiliated with, or sponsored by any bank, lender, broker or financial product provider. Nobody pays to influence a formula, a default value, or a word of the content.

We do not claim to be licensed financial advisers — and the site is deliberately designed so that it never needs to be one. Every page deals in published, verifiable financial mathematics: the same amortization, compounding and discounting formulas found in finance textbooks and used across the industry. Where a page depends on a rule of thumb or a debatable model (debt-to-income limits, rent-vs-buy assumptions), the page says so explicitly and shows the assumption so you can change it.

Principles

• Show the work. Every calculator documents its formula, variables, rounding and assumptions on the page — see our calculation methodology.
• Test the math. Formulas are covered by an automated test suite checked against known reference values before anything ships.
• Education, not advice. Results are estimates for understanding trade-offs, not recommendations. The disclaimer explains the boundary.
• Respect the reader. No fake experts, no invented statistics, no fabricated reviews, no pressure tactics. See the editorial policy.
• Privacy by architecture. Calculations run client-side; preferences stay in your browser. Details in the privacy policy.

If you find an error

Accuracy is the entire point of a calculator site, so error reports get priority over everything else. If a number looks wrong — against your lender's statement, another calculator, or your own arithmetic — please contact us with the inputs you used. The corrections policy describes exactly what happens next.

What's ahead

The current release covers 30 calculators across loans, mortgages, investing, savings and personal finance, plus a growing library of plain-English guides. New calculators are added deliberately — each must meet the same bar for accuracy, documentation and usefulness before it ships — rather than in bulk.