Cookie Policy
How we use cookies and what you can control.
Last updated: 3 November 2026.
Understanding Cookies
We use cookies and similar technologies to run the calculator site. Cookies use secure flags and appropriate SameSite policies.
Security logs use classified routes and short retention; raw source IPs are restricted to local security records. These records are used for security and operations. See our Privacy Policy.
Cookie Types
Essential Cookies
Required for core functionality; cannot be disabled.
- Theme / colour mode
- CSRF protection
- Cookie-consent choice
Local Calculator Storage
Drafts and recent calculations can store inputs and results in this browser. Clear this site’s browser data to remove them. Shared calculator links include their inputs in the URL, so share them only with people who should see those values.
Analytics Cookies
Help us improve the calculators if you opt in.
- PostHog page views and named calculator events; a random browser identifier may associate visits after optional consent
- Session replay, form autocapture, heatmaps and person profiles are disabled
- Sentry performance monitoring (minimal error diagnostics remain essential)
Advertising Cookies
Used if ads are shown on calculator pages.
- Google AdSense (when enabled)
Manage optional cookies on our Cookie preferences page.