Can I calculate without a birth time?

You can retain what is known and leave the Hour Pillar empty. If boundaries affect the other pillars, multiple candidates are shown.

Understanding and use

Do not treat an estimated time as confirmed. This tool checks possible candidates, without claiming an exhaustive list. Near solar terms, day changes or daylight-saving transitions, verify records, location and rules. Interpretations that depend on the Hour Pillar should wait for better information.