Last updated: July 2026
Overview
This Privacy Policy explains what information How Long Will It Last? ("we", "our", "the site") collects when you use our calculators and related pages, how we use that information, and the choices you have. By using the site you agree to this policy.
Information we collect
- Calculator inputs. The numbers you type into a calculator (balances, ages, returns, withdrawals) are processed entirely in your browser to produce the result. We do not store your calculator inputs on our servers.
- Contact information. If you use the contact form or email us, we receive the name, email address, and message content you provide.
- Automatic data. Like most websites, our hosting and analytics providers may collect basic technical data — IP address, browser type, device type, referring URL, and pages viewed — for security, reliability, and aggregate reporting.
Cookies and similar technologies
We use a small number of cookies and local browser storage to keep the site working, remember your preferences, and understand how visitors use our tools in aggregate. Advertising partners may set their own cookies as described below. You can control cookies through your browser settings.
Analytics
We may use privacy-respecting analytics (for example Google Analytics 4) to understand which calculators are used and where traffic comes from. Analytics providers process data on our behalf and are contractually restricted from using it to identify you personally.
Advertising partners
The site may display advertisements provided by third-party ad networks, including Google AdSense. These partners may use cookies and web beacons to serve ads based on your visits to this and other websites. This is called interest-based advertising. You can opt out of personalized advertising via Google Ads Settings or aboutads.info/choices. Google's use of the DoubleClick DART cookie enables it and its partners to serve ads to users based on visits to our sites and other sites on the Internet.
How we use information
We use the information described above to operate and improve the site, respond to your messages, ensure security, comply with legal obligations, and (where permitted) serve advertising that helps keep the tools free.
What we do not do
We do not sell your personal information. We do not share your calculator inputs with any third party. We do not build advertising profiles from the numbers you enter into our calculators.
Your rights
Depending on where you live, you may have the right to access, correct, delete, or restrict processing of your personal data, and to opt out of certain uses. To exercise these rights, contact us at the email listed on the Contact page.
Children
The site is not directed to children under 13, and we do not knowingly collect personal information from children.
Changes to this policy
We may update this policy from time to time. Material changes will be reflected on this page with a revised "Last updated" date.
Contact
Questions about privacy? Reach us at hello@howlongwillitlast.app or via the Contact page.