Scale

Scale	Name	Gauge	Std.	1′	Notes
1∶220	Z	6.5 ㎜	Int.	‌3⁄55″
1∶160	N	9 ㎜	Int.	‌3⁄40″
1∶148	N†	9 ㎜	UK	‌3⁄37″
1∶144	()	9 ㎜	—	‌1⁄12″
1∶120	TT	12 ㎜	Int.	‌1⁄10″
1∶90	()	—	—	‌2⁄15″	1∶45 ×½
1∶87	HO	16.5 ㎜	Int.	3.5 ㎜	“half 0”
1∶76.2	00†	16.5 ㎜	UK	4 ㎜
1∶64	S	22.4 ㎜	Int.	‌3⁄16″	1∶32 ×½
1∶60	()	—	—	‌1⁄5″	d20
1∶55	()	—	—	‌12⁄55″
1∶50	()	—	—	‌6⁄25″	1 m = 2 ㎝
1∶48	O	1¼″	NMRA	‌1⁄4″	1 1⁄4″ figures
1∶45	0	32 ㎜	MOROP	‌4⁄15″	mean
1∶43.5	0	32 ㎜	UK	7 ㎜	“0” < №I
1∶43	()	—	—	≈7.1 ㎜	1 2⁄3″ figures
1∶38.1	L†	37.7 ㎜	—	8 ㎜	L-gauge
1∶36	()	—	—	‌1⁄3″	GURPS
1∶32	№I/#1	32 ㎜	Int.	‌3⁄8″	aka “standard size”
1∶24	½″	—	—	‌1⁄2″	3″ figures
1∶22.5	№II	64 ㎜	MOROP	‌8⁄15″	1∶45 ×2
1∶20.32	F	71 ㎜	NMRA	15 ㎜
1∶18	()	—	—	‌2⁄3″	4″ figures
1∶16	№III	89 ㎜	MOROP	‌3⁄4″	1∶48 ×3
1∶12	1″	121 ㎜	NMRA	1″	6″ figures
1∶11	№V	127 ㎜	MOROP	1 1⁄11″	1∶55 ×5
1∶8	№VII	184 ㎜	MOROP	1 1⁄2″	1∶55 ×7
1∶5.5	№X	260 ㎜	MOROP	2 2⁄11″	1∶55 ×10

• MOROP Reduction ratios, scales, spacings (2011)
• NMRA Scales & Gauge (2014-12-02)
• NMRA Standards for Scale Models (2009 July)

Human height

From Preliminary Human Factors Guidelines for Traffic Management Centers (July 1999) FHWA, U.S. DoT

Males (North America)   5th % 50th 95th Stature 5′ 3 5⁄8″ 161.5 ㎝ 5′ 8 1⁄4″ 173.5 ㎝ 6′  3⁄4″ 185 ㎝ Eye height 5′  3⁄4″ 154.5 ㎝ 5′ 4 3⁄4″ 164.5 ㎝ 5′ 8 5⁄8″ 174 ㎝ Sitting height 2′ 9 1⁄4″ 84.5 ㎝ 2′ 11 3⁄4″ 90.5 ㎝ 3′ 2″ 96.5 ㎝ Body width 1′ 6 3⁄4″ 48 ㎝ 1′ 8 7⁄8″ 53 ㎝ 1′ 10 3⁄4″ 58 ㎝

Females (North America)   5th % 50th 95th Stature 4′ 11″ 150 ㎝ 5′ 2 7⁄8″ 160 ㎝ 5′ 7 1⁄8″ 170.5 ㎝ Eye height 4′ 9 1⁄4″ 145.5 ㎝ 5′  1⁄4″ 153 ㎝ 5′ 5 1⁄4″ 166 ㎝ Sitting height 2′ 6 7⁄8″ 78.5 ㎝ 2′ 9 3⁄8″ 85 ㎝ 2′ 11 3⁄4″ 90.5 ㎝

When standing normally (i.e., with some slump), eye height lowers ∼1.6″ (4 ㎝) for males and ∼1.2″ (3 ㎝) for females.

Extrapolating, eye height is ∼96% of stature, and body width is ∼32% of stature.

6mm

6 ㎜	∶ 171 ㎝	≡ 1 ∶ 285
6 ㎜	∶ 67 1⁄2″	≡ 1 ∶ 285 3⁄4
6 ㎜	∶ 172 ㎝	≡ 1 ∶ 286 2⁄3
‌1⁄4″	∶ 6′	≡ 1 ∶ 288
1″	∶ 25′	≡ 1 ∶ 300
6 ㎜	∶ 180 ㎝	≡ 1 ∶ 300
6 ㎜	∶ 6′	≡ 1 ∶ 304.8