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Please note that these are modified enchantment levels, not normal ones. This was taken directly from the code, do not modify this list. 
These are not the levels you need to pay for an enchantment. Note also that this is not just the base enchanting level provided by bookshelves; you must also take into account the modification of levels that occur in step one.

The minimum values are all calculated using a linear function y = kx+m where y is the calculated minimum value, x is the current enchantment power level and k and m varies between different enchantments. The maximum values can either be: the enchantment's minimum value plus a constant, the default minimum value of a generic enchantment plus a constant, or a constant level. All values obtained from 1.14.4 source code.

Armor enchantment Modified enchantment level
I II III IV V
Protection 1 – 12 12 – 23 23 – 34 34 – 45
Fire Protection 10 – 18 18 – 26 26 – 34 34 – 42
Feather Falling 5 – 11 11 – 17 17 – 23 23 – 29
Blast Protection 5 – 13 13 – 21 21 – 29 29 – 37
Projectile Protection 3 – 9 9 – 15 15 – 21 21 – 27
Respiration 10 – 40 20 – 50 30 – 60
Aqua Affinity 1 – 41
Thorns 10 – 60 30 – 70 50 – 80
Depth Strider 10 – 25 20 – 35 30 – 45
Frost Walker 10 – 25 20 – 35
Curse of Binding 25 – 50
Soul Speed 10 – 25 20 – 35 30 – 45
Swift Sneak 25 – 75 50 – 100 75 – 125
Sword enchantment Modified enchantment level
I II III IV V
Sharpness 1 – 21 12 – 32 23 – 43 34 – 54 45 – 65
Smite 5 – 25 13 – 33 21 – 41 29 – 49 37 – 57
Bane of Arthropods 5 – 25 13 – 33 21 – 41 29 – 49 37 – 57
Knockback 5 – 55 25 – 75
Fire Aspect 10 – 60 30 – 80
Looting 15 – 65 24 – 74 33 – 83
Sweeping Edge 5 – 20 14 – 29 23 – 38
Bow enchantment Modified enchantment level
I II III IV V
Power 1 – 16 11 – 26 21 – 36 31 – 46 41 – 56
Punch 12 – 37 32 – 57
Flame 20 – 50
Infinity 20 – 50
Tool enchantment Modified enchantment level
I II III IV V
Efficiency 1 – 51 11 – 61 21 – 71 31 – 81 41 – 91
Silk Touch 15 – 65
Fortune 15 – 65 24 – 74 33 – 83
Fishing rod enchantment Modified enchantment level
I II III IV V
Luck of the Sea 15 – 65 24 – 74 33 – 83
Lure 15 – 65 24 – 74 33 – 83
"Anything" enchantment Modified enchantment level
I II III IV V
Unbreaking 5 – 55 13 – 63 21 – 71
Mending 25 – 75
Curse of Vanishing 25 – 50
Trident enchantment Modified enchantment level
I II III IV V
Channeling 25 – 50
Impaling 1 – 21 9 – 29 17 – 37 25 – 45 33 – 53
Loyalty 12 – 50 19 – 50 26 – 50
Riptide 17 – 50 24 – 50 31 – 50
Crossbow enchantment Modified enchantment level
I II III IV V
Multishot 20 – 50
Piercing 1 – 50 11 – 50 21 – 50 31 – 50
Quick Charge 12 – 50 32 – 50 52 – 50

Very low modified enchantment levels can fall outside the ranges of all valid enchantments for certain items. If this happens, the item is left unenchanted, but the player is not charged any experience levels and can try enchanting it again.

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