About AllCalculators.org
Free, fast, and private online calculators for everyone
Our Story
AllCalculators.org was founded in 2024 by Jishan Giras, a full-stack developer who was tired of the same problem: every time he needed a quick calculation — whether it was estimating mortgage payments, checking a BMI, or planning retirement contributions — he'd land on a slow, ad-cluttered website that required creating an account or waiting through pop-ups just to see a result.
So he built the alternative he always wanted. Every tool on AllCalculators.org is designed with a single rule: the result should appear before the user has finished thinking about the question. No accounts. No paywalls. No bloat.
Our Mission
Our mission is to provide a growing collection of free online calculators and developer tools that are fast, accurate, and easy to use — for everyone, everywhere. Whether you need to calculate your BMI, estimate mortgage payments, convert units, format JSON, track your pregnancy, or plan your retirement savings — we have a tool for that, and it works the moment you open the page.
What We Offer
Simple, scientific, and graphing calculators plus unit conversion for everyday and advanced math.
BMI, TDEE, sleep cycle, and pregnancy calculators for wellness tracking and informed health decisions.
Compound interest, mortgage, 401(k), TFSA, credit score, and simple interest tools for financial planning.
Earnings estimators for YouTube, Instagram, TikTok, and X/Twitter based on real CPM and engagement data.
GPA, CGPA, and percentage converters covering US, Canadian, and Indian grading systems.
Hash generator (MD5, SHA-256+), JSON formatter, and JavaScript formatter/validator for developers.
Shoe, shirt, and pants size conversion charts for US, EU, UK, and Asian sizing standards.
Days between dates, timezone comparison, and printable calendar tools.
Our Approach to Accuracy
We take the correctness of our formulas seriously. Our health calculators use clinically validated equations — BMI follows the standard WHO formula, TDEE uses the Mifflin-St Jeor Equation (validated in peer-reviewed studies as the most accurate BMR formula for most adults), and our pregnancy calculator uses Naegele's Rule, the same method used by obstetric practitioners worldwide. Our financial calculators use standard amortization and compound interest formulas consistent with those used by major financial institutions.
Where estimation is inherent (such as social media earnings or credit scores), we make our assumptions explicit and provide ranges so you can make informed decisions.
Privacy First
All calculations run entirely in your browser. Your data — height, weight, income, date of birth, none of it — is ever sent to our servers, stored, or shared. We believe your information should stay on your device. The only data we collect is anonymous usage analytics (which pages are visited, how long) via Google Analytics, and we are transparent about this in our Privacy Policy.
No Account Required
Every tool on AllCalculators.org is completely free to use with no sign-ups, no logins, and no paywalls. We believe access to useful calculation tools should not be gated behind a registration form. Just open a calculator and start using it immediately.
Built for Speed
Our tools are lightweight and optimized for performance. They work on any modern browser — desktop, tablet, or phone — with instant results and no page reloads. We deliberately avoid heavy frameworks and third-party dependencies wherever possible to keep load times fast on all connection speeds.
Open to Feedback
Have a suggestion for a new calculator? Found a bug or an inaccuracy in a formula? We genuinely want to hear from you — user feedback is how we improve. Visit our contact page to get in touch. We read every message and typically respond within 1–2 business days.