Privacy

There is no sign-up and no account. Every calculator runs in your browser, so the times, ages and settings you enter are never sent to our servers.

What is saved on your device

To remember you, the site saves your last inputs (such as wake-up time, a child's age or a baby's age), your 12/24-hour clock choice and your light/dark theme choice in your browser's local storage. This stays on your device. Clear your site data to remove it. If your browser blocks storage, the tools still work; they just won't remember you.

Analytics and ads

This site does not currently use analytics, advertising or tracking cookies. If that changes, this page will say exactly what is used.

Server logs

Like any website, our hosting provider may keep standard technical logs (such as IP address, browser type and the pages requested) for security and reliability. We do not use these to identify or profile you.

Emailing us

If you use the contact form, your name, email and message are sent through FormSubmit (formsubmit.co) to our inbox. We only use them to reply to you. The calculators themselves never send your data anywhere.

Children

The site is meant for parents and adults. Tools for children are used by the adult, and we never ask for a child's name or any personal details.

Changes

If this policy changes, we will update this page. Last updated: October 2026.

Medical disclaimer

This site provides general information and is not a substitute for medical advice.