Redefining the Giantess Scale
Amazon: 2.1 m ~ 3.7 m (7 ft ~ 12 ft)
This class of giantess has actually been recorded in reality; whilst modern day humans rarely reach above seven feet, skeletons from ancient times have been found up to twelve feet in length. Thus, I do not truly consider characters of this height to truly be giantesses.
Giantess: 3.7 m ~ 1 Dm (12 ft ~ 32.8 ft)
This would be the size of a small house, anywhere from one to three stories tall.
Decagiantess: 1 Dm ~ 1 Hm (32.8 ft ~ 328 ft)
This category includes the famous "50 foot woman"; this woman would be the size of larger buildings, but not skyscrapers. A moving object of this size would definitely catch the attention of global satellite systems.
Hectogiantess: 1 Hm ~ 1 Km (328 ft ~ 3280 ft)
This category is when a giantess begins to draw attention from a distance; ranging from the size of small skyscrapers to small mountains, she would be visable from a good ways away.
Kilogiantess: 1 Km ~ 1 Mm (3280 ft ~ 621 mi