The Orthodox Union has released its annual “Guide to Passover,” which provides comprehensive guidance about kosher-for-Passover products.

This year’s edition, available in both PDF and online database formats, features nearly 30,000 kosher-for-Passover products and charts on ingredient substitutions, halachic times for Passover, required portion sizes at the seder and directions on the “Counting of the Omer” (Sefirat HaOmer).

Passover begins on the evening of Saturday, March 27 (after Shabbat) through sundown on Sunday, April 4.

The guide also includes instructions on holiday preparation, articles on spices and how to celebrate Erev Pesach on Shabbat HaGadol (which will take place this year on March 26-27) and the impact of shemittah on the Diaspora, which will affect the next two Passovers.

The database, as well as the 118-page PDF, can be accessed from computers, tablets and mobile devices at: www.oupassover.org.