Terms of Use

You may use the calculators for personal, educational or business purposes at no charge. You may link to any page and quote a result in your own work.

Please do not attempt to disrupt the service, scrape it at a volume that degrades it for others, republish the site's pages as your own, or use it for anything unlawful.

The calculators are offered without warranty of any kind. We work hard on accuracy and test every tool, but we do not guarantee that a result is free of error or suitable for your particular situation. Always check important figures independently. See the disclaimer for detail.

To the fullest extent permitted by law, we are not liable for any loss or damage arising from use of the site or reliance on a result, including financial loss, lost profits or consequential loss.

The site's text, layout and calculation code belong to us. The mathematical formulas themselves are public knowledge and free for anyone to use.

Tools may be added, changed or withdrawn without notice, and the service may be unavailable from time to time. We may update these terms; the date above shows the current version. Questions can go through the contact page.