THE SHORT VERSION
Your numbers
stay in your browser.
Calculations are performed on your device. Your saved calculator choices are stored in this browser’s local storage.
How this site works.
The calculator inputs are processed by JavaScript in your browser and are not intentionally sent to an application server. Your saved kit is stored locally until you remove it or clear site data. It is not synced between devices.
Website measurement.
When enabled on a deployment, Cloudflare Web Analytics helps us understand page visits, referring sites and page performance. Cloudflare may receive information such as the page path, country, browser and device type. Cloudflare states that its Web Analytics does not use cookies or local storage for measurement. Learn more in Cloudflare’s Web Analytics information.
Cloudflare, our hosting provider, may also process ordinary request information, such as an IP address, when delivering the site. This version does not serve ads or use user accounts or third-party AI services. The site may publish static AdSense verification records; those records do not load advertisements.
Do not enter sensitive personal information into calculator fields. Clearing your browser’s site data removes the locally saved kit.