How Armor Works in League of Legends

How Armor Works in League of Legends


The Calculation

This percentage of reduction is determined by the formula: Damage Reduction = Total Armor / (100 + Total Armor). For example, a champion with 150 points of Armor would receive 150 / (100 + 150) = 60% reduced damage from physical attacks. The Total Armor is determined by your personal Armor - the amount of Armor Penetration the attacking opponent has.

When armor goes below 0, the calculation transfers to Damage Reduction = Total Armor/ (100 - Total Armor)

This keeps the calculation functional so that -100 Armor translates to -50% Damage Reduction (meaning you take 50% more damage)

Armor Graph

x / 100 + [x]

Total Armor /// Damage Reduction /// Physical Attack dealing 100 damage

0 0.00% 100.00

10 9.09% 90.91

20 16.67% 83.33

30 23.08% 76.92

40 28.57% 71.43

50 33.33% 66.67

60 37.50% 62.50

70 41.18% 58.82

80 44.44% 55.56

90 47.37% 52.63

100 50.00% 50.00

110 52.38% 47.62

120 54.55% 45.45

130 56.52% 43.48

140 58.33% 41.67

150 60.00% 40.00

160 61.54% 38.46

170 62.96% 37.04

180 64.29% 35.71

190 65.52% 34.48

200 66.67% 33.33

210 67.74% 32.26

220 68.75% 31.25

230 69.70% 30.30

240 70.59% 29.41

250 71.43% 28.57

260 72.22% 27.78

270 72.97% 27.03

280 73.68% 26.32

290 74.36% 25.64

300 75.00% 25.00

310 75.61% 24.39

320 76.19% 23.81

330 76.74% 23.26

340 77.27% 22.73

350 77.78% 22.22

360 78.26% 21.74

370 78.72% 21.28

380 79.17% 20.83

390 79.59% 20.41