1. By our count, there are currently 146 uncommitted delegates (other counts differ slightly) who are free to support whichever candidate they choose at the convention: nine from American Samoa; nine from Guam; five from the Virgin Islands; 28 from North Dakota; 54 from Pennsylvania; three from Oklahoma; 10 from Louisiana; four from Wyoming; seven from Colorado; and 17 from Minnesota. This number will likely rise as delegate spots that were pledged to former candidates become uncommitted. It may also change based on the outcome of the West Virginia primary or if additional candidates drop out of the race.

2. Pennsylvania will elect three uncommitted delegates in each of its 18 congressional districts on April 26, in addition to the 17 delegates that will be bound based on the statewide vote.

States that allocate delegates proportionally have different rules for how they do so. Some set minimum vote-percentage thresholds that must be met for a candidate to receive delegates. Also, in some states, a candidate who reaches a threshold, either statewide or in a congressional district, is awarded all of the jurisdiction’s delegates even if the allocation is otherwise done proportionally. For simplicity’s sake, this tool allows delegates to be assigned in one-delegate increments in places where they may be awarded proportionally.

Expert averages are “olympic averages” — the highest and lowest estimates were discarded in calculating them. They were originally published on March 21.

Additional contributions from Allison McCann.

Sources: Republican National Committee; The Green Papers; FrontloadingHQ; news reports.