Contact Us
We'd love to hear from you. Whether you've found a bug, have a suggestion for a new calculator, or simply want to share your feedback — your message matters to us and we read every one.
Send Us a Message
Direct Contact
Response Time
Typically within 1–3 business days
Location
The Netherlands
We Can Help With
- Bug reports and technical issues
- Suggestions for new calculators
- Feedback on accuracy or results
- General website feedback
- Partnership or collaboration inquiries
- Accessibility improvement requests
Helpful Resources
Frequently Asked Questions
How quickly will I get a response?
We aim to respond to all inquiries within 1–3 business days. During busy periods it may take a little longer, but we make sure to read and reply to every message we receive.
Can I suggest a new calculator?
Absolutely! We love hearing suggestions from our users. If there's a calculator type you'd like to see added to our site, just drop us a message with the details. We regularly add new tools based on user requests.
What if I find an error in a calculator?
Please report it! Tell us which calculator, what you entered, and what result you expected vs. what you got. Accuracy is our top priority, and we investigate all reported issues promptly.
Do you accept advertising partnerships?
We're open to relevant advertising and partnership opportunities. Please use the contact form to describe your proposal and we'll get back to you. We only partner with brands that align with our educational mission.
Can I use your calculators on my website?
Our calculators are designed for use on The Online Calculator website. If you'd like to discuss embedding or licensing options, please get in touch and we can explore the possibilities together.
Is this a free service?
Yes, all calculators on The Online Calculator are completely free to use, require no registration, and have no usage limits. We're funded by advertising, which allows us to keep our tools free for everyone.