Scale models can be so confusing.
Here is the best way for us to help you to easily understand "scale" with this bit of information below.
Example:
In real life, a door is about 7 ft tall.
In real life, a man is about 6 ft tall.
In N scale, (1:160) a man is about .375" (3/8") tall. (1/16"=1 foot)
In N scale, (1:160) a door is about .44" (7/16") tall. (1/16"=1 foot)
In HO scale, (1:87), a man is about .75" (3/4") tall. (1/8"=1 foot)
In HO scale, (1:87), a door is about .875" (7/8") tall. (1/8"=1 foot)
In S scale, a man is about 1.125" (1-1/8") tall. (3/16"=1 foot)
In O scale, (1:48), (1/4" Scale), a man is about 1.5" tall. (1/4"=1 foot)
In O scale, (1:48), (1/4" Scale),a door is about 1.75" tall. (1/4"=1 foot)
In G scale, (1:22), a man is about 2.75" tall. (approx. 3/8"=1 foot)
In G scale, (1:22), a door is about 3.25" tall. (approx. 3/8"=1 foot)
WARMACHINE & HORDES models tend to fit into the S Scale and O scale range.
In some circumstances, G scale is okay if you want a building or steam train to tower over your minitures.
Z scale: Trains built to a ratio of 1:220. A 75-foot-long locomotive measures 4 inches long. The rails of the track are 6.5 mm apart.
N scale: Trains built to a ratio of 1:160. A 75-foot-long locomotive is 5 1/2 inches long. The rails of the track are spaced 9 mm apart.
HO scale: Trains built to a ratio of 1:87. A 75-foot-long locomotive is 10 1/2 inches long. The rails of the track are 16.5 mm apart.
S scale: Trains built to a ratio of 1:64. A 75-foot-long locomotive is 14 inches long. The rails of S gauge track are 7/8 inches apart.
O scale: Trains built to a ratio of 1:48. A 75-foot-long locomotive is 18 3/4 inches long. The rails of O gauge track are 1 1/4 inches apart.
G scale: These trains are built to a ratio of 1:22.5. A 75-foot-long locomotive is 40 inches long. G and other large scale trains run on gauge 1 track with rails 45 mm apart.
Also, see here.