About MyPersonalCalculator.com
MyPersonalCalculator.com builds fast, focused calculators for the numbers people actually need day to day — mortgage payments, BMI, GPA, compound interest, and more. Every calculator is a standalone page: no sign-up, no app to install, and no walls between you and the answer.
Each calculator ships with the formula behind it, a worked example, and answers to the questions people ask most, so you can check the math yourself instead of taking a black box's word for it. The full breakdown of how those formulas are sourced and verified is on the Methodology page.
Who runs this site
MyPersonalCalculator.com is built and maintained independently, not by a bank, a health system, or a large media company. That has a couple of practical effects worth being upfront about. On the plus side: no sign-up walls, no upsells, and no incentive to make a calculator harder to use than it needs to be. On the other side: this is a reference tool built on standard published formulas, not a substitute for personalized advice from a licensed professional — see the Disclaimer for where that line sits.
How the site is funded
MyPersonalCalculator.com is supported by advertising, which is what keeps every calculator free with no account required. Advertising placement has no influence on which calculators get built, what formula a calculator uses, or what number it outputs — the arithmetic is the same regardless of what's advertised on the page that day.
Corrections and requests
If a formula looks wrong, an edge case breaks a calculator, or there's a calculator you wish existed, the Contact page is the way to reach us. Reported issues are the main way calculators get corrected and improved.
Frequently asked questions
Is MyPersonalCalculator.com free to use?
Yes — every calculator is free, with no account, sign-up, or subscription required. The site is supported by advertising instead.
Do you store the numbers I enter into a calculator?
No — every calculation runs locally in your browser. Nothing you type into a calculator is sent to or stored on a server.
How accurate are the calculators?
Each calculator uses the standard, published formula for its category (see the Methodology page for specifics per category). Accuracy depends on the inputs you provide — for anything with financial, medical, or legal consequences, treat the result as a well-sourced estimate to confirm with a qualified professional, not a final answer.
Who runs this site?
MyPersonalCalculator.com is built and maintained independently, rather than by a bank, health system, or large company — see the section above for what that means in practice.
How do I report an error or request a new calculator?
Use the Contact page. Reported errors and requests are the main way the site improves over time.