Contact
Last updated 19 August 2026
There is deliberately no contact form here. A form would mean collecting and storing what you type, and the whole point of Period Calculator is that it stores nothing about you.
An email address for this site is not published yet.
Rather than show an address that would bounce, this page leaves it out until a real inbox is in place. Nothing you have entered into the calculator is affected either way: it is on your device only, and the privacy policy explains how to delete it yourself.
Reporting a bug
Wrong dates, a control that will not open, or something that looks broken on your phone are all worth reporting. Include these and it can usually be reproduced on the first try:
- Which mode you were in, regular or irregular.
- The exact numbers you entered, including the last-period date.
- What the page showed, and what you expected instead.
- Your browser and device, for example "Chrome on Android" or "Safari on iPhone".
What cannot be answered here
- Medical questions. Nobody here is a clinician. For pain, missed periods, bleeding changes, contraception or trying to conceive, speak to a doctor, midwife, nurse or pharmacist who can actually examine your situation.
- Requests to look up, change or delete your data. There is nothing to look up. No dates, notes or predictions are held on any server, so account-style requests cannot be actioned. Deletion is done from your own browser, and theprivacy policy lists the steps.