¼ scale means :   The original is 4 times bigger than the model.
1 inch represents 4 inches of the original
3 inches represents 1 foot of the original, followed by the decimal equivalent.
250 mm represents 1 meter of the original.
   1 inch
1 scale
1 foot decimal
1 m scale
  SCALE
represents
foot
  scale
in   mm
COMENTS
   1/4  
4"
3"
3.000
250.0 mm
R/C Models , Steam Trains
   1/8  
8"
1 1/2
1.500
125.0 mm
Cars, Motorcycles, Steam Trains
   1/12 
1'
1"
1.000
83.3 mm
   1/16 
1'4"
 3/4
0.750
62.5 mm
   1/20 
1'8"
 19/32
0.600
50.0 mm
Cars
1/22.5
1'10   1/2"
 17/32
0.530
44.4 mm
Trains G scale
   1/24 
2'
 1/2
0.500
41.7 mm
   1/25 
2'1"
 15/32
0.480
40.00 mm
Autos, Camiones
   1/32 
2'8"
  3/8
0.375
31.25 mm
Airplanes, Cars, Scale 1 Trains
   1/35 
2'11"
 11/32
0.343
28.57 mm
Armor
   1/43 
3'7"
  9/32
0.279
23.25 mm
Cars,  Trucks
   1/48 
4'
 1/4
0.250
20.83 mm
   1/64 
5'4"
  3/16
0.188
15.62 mm
   1/72 
6'
 11/64
0.167
13.88 mm
Airplanes, Armor, Boats
   1/76 
6'4"
  5/32
0.158
13.16 mm
Armor
   1/87 
7'3"
0.138
11.49 mm
Armor, Scale HO Trains
   1/96 
8'
  1/8
0.125
10.42 mm
Ships scale 1/8, Airplanes
   1/100
8'4"
-
0.120
10.00 mm
Airplanes
   1/125
10'5"
-
0.096
8.00 mm
   1/144
12'
-
0.083
6.94 mm
   1/160
13'4"
-
0.075
6.25 mm
Scale N Trains
   1/192
16'
1/16"
0.063
5.21 mm
Ships scale 1/16
   1/200
16'8"
-
0.060
5.00 mm
Airplanes, Ships
   1/220
18'4"
-
0.055
4.54 mm
Trains scale Z
   1/285
23'9"
-
0.042
3.5 mm
War Games figures and pieces
   1/350
29'2"
-
0.034
2.86 mm
Ships
   1/700
58'4"
-
0.017
1.43 mm
   1/720
60'
-
0.017
1.38 mm
   1/1200
100'
-
0.010
0.83 mm
War Games Ships
   1/2400
200'
-
0.005
0.42 mm
Popular Scales
-
Ships
Ships
War Games Ships
Cars, Motorcycles, Doll Houses
Cars, Motorcycles, Steam Trains
Cars, Trucks, Doll Houses
Airplanes, Scale O Trains
Airplanes, Scale S Trains
Airplanes
Airplanes
¼ scale
SCALE EQUIVALENTS

Assuming average height is 5'8"
5'8" = 1717 mm

X mm =    1  
1717        scale denominator
1 1