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Quick answers to common questions

The calculator gave a wrong time. Please check your device timezone settings. The calculator uses your browser's local time. If the issue persists, use the contact form above and include your operating system and browser version.
The ambient sounds won't play. Most browsers require a user interaction before audio can start. Tap or click any sound button in the bottom bar. Safari on iOS may require additional permissions — check your browser sound settings.
Does this tool store my data? No. The calculator runs entirely in your browser. We don't collect, store, or transmit any personal health data. Dark mode preference is saved locally in your browser only.
Can I embed or share this tool? Yes — link directly to this page freely. If you'd like to embed it in your website or use it commercially, please reach out via the form above.
I have an idea for a new tool. We love that! Describe your idea in the form above using the "Feature Request" subject. We consider every suggestion seriously when planning new tools.