Privacy policy
The calculator runs in your browser. We do not collect names, addresses, or tracking numbers.
What happens on your device
Postage, extra-service fees, and stamp counts are computed locally. We do not send mailing addresses, sender details, tracking numbers, or envelope contents to a server.
Accounts and personal data
There is no account and no payment form. We do not sell or rent personal information because we do not collect it for the calculator.
localStorage
Your last calculator choices, such as shape, weight, and extra services, may be saved in your browser's localStorage under cm-calc-v1. Cookie choices are saved under consent. That data stays on your device. Clear it in the browser whenever you want.
Ads
This site may show Google AdSense ads. Ad cookies are governed by the consent banner. Google and its vendors may use cookies to serve ads based on visits to this or other sites. See the Google ads privacy page to review or change those settings.
Analytics
With your consent, we use Google Analytics (GA4) to count page views and see which calculator settings people use. The tag loads only after you accept analytics in the cookie banner. IP anonymization is on. We do not send mailing addresses, tracking numbers, or envelope contents, because this page never collects them.
Your choices
You can change or withdraw advertising and analytics consent at any time. Necessary storage that keeps the calculator working cannot be switched off here.
Publisher and contact
certifiedmailcost.com is operated by Keyro Labs. Privacy questions: hello.keyrolabs@gmail.com.
Last updated · September 2026