Diablo 4 Glyph XP Calculator will help you determine how many Nightmare Dungeons you need to run to get your Glyphs to levels 15 and 21.
Diablo 4 Glyph XP Calculator
It was created by djinfish and requires user input. You must first Make a Copy and then adjust two attributes.
- Glyphs Level – Enter the level of the glyph you would like to check.
- Highest Tier Nightmare Dungeon Completed – Enter your highest Tier Nightmare Dungeon.
You will find the calculator here.
Source: Reddit