Chartopia

d100	Result	Roll On
1-40	Common	Roll on "Common"
41-50	Common or Uncommon	Roll on "Common" or Roll on "Uncommon"
51-70	Uncommon	Roll on "Uncommon"
71-86	Rare	Roll on "Rare"
87-92	Rare or Very Rare	Roll on "Rare" or Roll on "Very Rare"
93-100	Very Rare	Roll on "Very Rare"

AD&D 1e Monster Encounters Template (by rarity) (d100)