MM 
IN Punch Style*
Louis Vuitton
Filofax
Gillio
Pocket
81 x 120 
6 Ring (19 MM)
PM - Small Ring
Pocket
Pocket
A6
105 x 148 
6 Ring (19MM/38 MM)
x x
A6
Personal
95 x 171 

3.74 x 6.74
6 Ring (19MM/50 MM)
MM - Medium Ring
Personal
Medium
Personal Wide
120 x 171
4.74 x 6.74 
6 Ring (19MM/50 MM)
x x x
Mini Happy Planner 117.5 x 178
4.625 x 7
7 Discs
x x x
B6  127 x 178
5 x 7
6 Ring (19MM/50 MM)
B6 Wide
5.3 x 7
6 Ring (19MM/50 MM)
Half Letter
5.5 x 8.5 
8 Discs
Desk Agenda x x
A5
148 x 210 
6 Ring (19MM/70 MM)
GM - Large Ring
A5
A5
Franklin Covey Compact
4.25 x 6.75 
6 Ring (19MM/50 MM)
x x x
Classic Happy Planner
7 x 9.25
9 Disc Punch x x x

 

 

 

*Measurements are of the distance between each ring and each set of rings. Most ring planners will have two sets of three rings. Each of the three rings in one set are 19mm apart. The distance between the two set of rings will vary. For example, personal rings have a distance of 50mm between the two set of three rings. A5 have a distance of 70mm between the two set of three rings.