How much medieval armor weighed?

Answer 1

A full set is about 30 kg (66lb)
I looked this up and found out it was 45 pounds. I expected more and today's Army has it's people carry a heavier load.

It depends on the type of armor you are referring to, as the medieval time period had several different common types of armor.

The ultimate Plate Armor suit (one composed completely of interlocking steel plates) was heavy, typically in the 100-120 lbs range (with ceremonial-only vesions up to 150+ lbs). Only the richest nobles owned one, and it was for horse-mounted use only, and the wearer could not effectively walk in such a suit. This suit was seldom (if ever) worn in combat, being reserved for jousting or ceremonial occasions only. While heavy, it was surprisingly flexible, allowing for a very good range-of-motion.

The next step down would be Plate Mail armor, a combination of lightweight chain mail, leather, and several larger plates of steel. That's still heavy, in the 40-75 lbs range, though for a strong man, one can trot (or even run for a couple of dozen yards) and fight effectively for reasonable periods of time (several hours). This is what most late-period knights (both noble and lesser status, 1200 AD and onward) wore into combat. It became common even for lower-status men-at-arms to wear starting 1400 A.D. , and was worn both by mounted and foot soldiers.

Most common in earlier medieval times would have been the chain mail shirt or coat, covering the arms, torso, and hanging down to the knees like a oversized bedshirt. These could be rather thick, with several layers of interlocking chain link. A lightweight and small version would weigh 20-30 lbs, but a more typical example would be 40+ lbs. Unfortunately, the weight distribution of chainmail is very poor, falling almost exclusively on the shoulders and neck, making is considerably more tiring to wear than its weight would otherwise indicate, meaning that it was seldom worn for any length of time, being donned just before combat was expected. Chainmail was typically the pre-1200 A.D. knight's armor, and became the professional footsoldier's armor starting around 1100 A.D.

Finally, at the bottom, would be various combination of leather shirts and suits with small metal plates sewn on. These could weigh 10 to 30 lbs, depending on construction. These types were the commoners' armor, equipping the militias and peasant sections of armies.