Free calculators for the everyday money questions people actually search for — no account, no paywall, no clutter.
Most financial calculators online are buried inside long articles, hidden behind email sign-up walls, or cluttered with so many ads that the tool itself is hard to find. We built My Smart Free Tools to fix that: type in your numbers, get your answer, and move on with your day.
Every calculator on this site runs entirely in your browser. Your inputs — a loan amount, a salary figure, a home price — are never sent to us or stored anywhere. We simply don't have a way to see what you type, by design.
We focus on tools tied to real decisions: buying a home, taking on a loan, paying down debt, or understanding a paycheck. Each calculator is paired with a short explanation of the math behind it and answers to the questions people commonly ask about that topic, so you can understand the "why," not just get a number.
The site currently covers five areas:
We also write longer guides for bigger decisions, where one calculator is not enough. How much house can I afford? walks through income, down payment, rates and debts together, and DTI for a car loan explains how lenders look at your debts before an auto loan.
Every tool starts from a published, standard method rather than a shortcut. Loan and mortgage payments use the standard amortization formula, the same one lenders use to build a payment schedule. The BMI calculator sorts results into the adult categories published by the World Health Organization. The calorie calculator uses the Mifflin-St Jeor equation, or Katch-McArdle when you know your body fat percentage. Where a method has limits, the page says so next to the result instead of hiding it in fine print.
Each calculator page follows the same structure, so you always know where to look:
Before a calculator or guide goes live, we recompute its worked examples separately, outside the page, and compare the results. Every figure in a guide, such as the home price a given income can support, comes from the same model the matching calculator uses, so the guide and the tool never disagree.
We also test edge cases on purpose: leap years, month ends, very large numbers, zero interest rates and empty fields. That testing has caught real problems, and we fixed them rather than working around them. Two examples:
We review the site regularly and update pages when we add features, find a clearer way to explain something, or spot an error. If a result looks wrong to you, please tell us the numbers you entered and what you expected. We check every report, and if the tool is wrong we fix it.
This site is supported by advertising, which lets every tool stay free with no account required. You can read exactly how that works, and what data is or isn't collected, in our Privacy Policy.
We're not a bank, lender, or licensed financial advisory. Every calculator here is a general-purpose estimation tool, not personalized financial advice. For decisions with real money on the line, we'd always encourage pairing these numbers with advice from a qualified professional who knows your full situation.
Questions, feedback, or found something that looks wrong? We'd like to know — reach us at contact@mysmartfreetools.com.