Have a question, found a bug, or want to suggest a new calculator? We would love to hear from you.
At CalculatorHub, we take every message seriously. Whether you have a simple question about how a calculator works, spotted an error in our formulas, or have an idea for a new tool — we want to hear it. Your feedback directly shapes what we build next.
Questions about calculators, how to use a feature, or anything general.
support@calculatorhub.websiteFound an incorrect calculation or a broken feature? Let us know so we can fix it fast.
Report a BugWant a specific calculator that we do not have yet? Suggest it and we may build it next.
Suggest a CalculatorFor advertising, content partnerships, sponsorships, or collaboration opportunities.
Business InquiryWe typically respond to all inquiries within 24 to 48 hours on weekdays. For urgent matters, please mention "URGENT" in your subject line.
Many common questions are already answered below. Check if your question is covered here before sending us an email — it is often faster!
Yes, 100%. Every single calculator on CalculatorHub is completely free to use. There is no subscription, no account required, and no hidden fees of any kind. We are supported by non-intrusive advertising.
We use verified mathematical formulas from authoritative sources including the Reserve Bank of India (RBI), World Health Organization (WHO), Indian Income Tax Department, and US IRS guidelines. All formulas are reviewed regularly for accuracy. That said, results are for educational purposes and should not replace advice from a qualified professional.
No. All calculations happen locally in your browser using JavaScript. We do not transmit, collect, or store any values you enter into our calculators. Your financial and personal data is completely private.
We appreciate bug reports! Please email us at support@calculatorhub.website with the calculator name, the values you entered, and the result you expected. We typically fix reported errors within 24–48 hours.
Absolutely! We regularly add new calculators based on user requests. Email us your idea with a brief description of what the calculator should do, and we will evaluate it for our next update. We have already built several calculators based on user suggestions.
Please contact us at support@calculatorhub.website to discuss embedding options. We may be able to arrange this on a case-by-case basis. Unauthorized embedding or copying of our calculator code is not permitted under our Terms of Use.
Not yet, but CalculatorHub is fully optimized for mobile browsers and works like a native app. You can add it to your home screen from your browser's menu for a near-app experience. A dedicated mobile app is on our roadmap.
To help us respond quickly and accurately, please include the following when contacting us:
CalculatorHub is a free online calculator platform offering 80+ tools across finance, health, education, real estate, business, and more. Our mission is to make complex calculations simple, accurate, and accessible for everyone — students, professionals, entrepreneurs, and everyday users around the world.
Visit our About page to learn more about who we are, what we stand for, and the full range of calculators we offer.