siutil. Buddhist Memorial Date Calculator
processed in your browser · never uploaded

Counted from the date of death as day 1 (Buddhist custom). Services are often held on or before each date.

Enter the date of death (meinichi) to automatically build a schedule of Japanese Buddhist memorial services. The seventh-day services (shonanoka, futananoka … shijukunichi/49th, and the 100th day) are counted the traditional way, with the day of death as day 1. It also lists the annual memorials (kaiki): 1st, 3rd, 7th, 13th, 17th, 23rd, 27th, 33rd and 50th, each on the same month and day as the death, with year and weekday. Key milestones are noted, such as the 49th day (end of mourning) and the 33rd as the common final memorial. The table prints directly for planning and invitations. Everything runs in your browser; the date you enter is never stored or uploaded.

How to use

  1. Enter the date of death.
  2. See every memorial date — the seventh-day services and the annual kaiki — with its weekday.
  3. Use Print to print the schedule if you need a copy.

FAQ

Does the day count include the date of death?

Yes. In Japanese Buddhist custom the date of death is counted as day 1, so the 7th-day service falls 6 days after death and the 49th-day service falls 48 days after. This tool uses that counting.

How is the year of each annual memorial (kaiki) decided?

The 1st memorial (isshuki) is exactly one year after death. From the 3rd on, the year of death is counted as the first, so the 3rd kaiki is two years after, the 7th is six years after, and so on — the nth kaiki falls (n-1) years after death, on the same month and day.

Are there regional or sect differences?

Yes. For example, in the Kansai region the 35th day is sometimes treated as the end of mourning, and services may be brought forward. This tool shows a common, general schedule; confirm details with your family temple.

Is the date I enter stored?

No. All calculation runs in your browser; the date of death is never stored or uploaded and is not sent to any server.