The index at the bottom of each picture describes a few abbreviations used and also the format in which the armor details are described in. Effective Armor (EA) refers to the overall effectiveness of the armor without normalization.
The armor values are presented in three different scenarios for the angled view of the tank.15° frontal(75° side), 25° frontal(65° side), 35° frontal(55° side), and 45° frontal(45° side).
Frontally the KV-1 is actually easy to deal with if you remember a few small “rules”. The first one is the avoid shooting any heavily angled areas as you will bounce off a lot. Even the UFG#2 can bounce a lot of shells since it is near the 70 degree auto-bounce angle(although it is somewhat negated since it is low to the ground). Avoid shooting the beak at all costs as it will bounce shot after shot. Also, the turret does have various weak spots located around the gun and to the left/right of the mantlet which can be used at close range…just make sure to hit them fully aimed so you don’t hit the tough around around them. Lastly the “ears” and sights on the KV-1 colored in purple do not do any HP damage but only destroy modules or kill the crew.

A KV-1 from the side is extremely vulnerable due to the lack of angles on the side of the tank. The main strong points are the turret since it is thicker than the hull and also the areas where the tracks overlay the hull armor. Just fire away at the side hull armor and be careful of not hitting the purple track sections since there is no hull behind those areas. Aim towards the rear of the KV-1 to set it on fire fairly often(1-4 shots will do it).

An angled KV-1 can prove to be a difficult opponent for many tanks the KV-1 normally faces. Use the side and frontal sections for turret armor information and for the hull all of the effective armor and armor values against AP are listed in the picture. The best locations to aim are the frontal weak spots unless the KV-1 angles a lot which opens up the upper side hull armor.



Weak Spot Guide: AT 8 - World of Tanks Guru
Weak Spot Guide: ARL 44 - World of Tanks Guru
Weak Spot Guide: IS-3 - World of Tanks Guru
Weak Spot Guide: Ferdinand - World of Tanks Guru
World of Tanks Guide - 59-16