Af Fitness Calculator

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Reviewed by David Chen, CFA

Veteran TTRPG Mechanics Analyst & Quantitative Strategy Expert

Accurately determining the Challenge Rating (CR) of your homebrew monsters is essential for balanced combat. This D&D 5e CR calculator uses the official Dungeon Master’s Guide (DMG) guidelines to compute Defensive and Offensive CR, providing a reliable final encounter rating.

dnd 5e cr calculator

Estimated Challenge Rating
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dnd 5e cr calculator Formula:

DCR (Defensive CR) = Base HP CR + (AC Adjustment)
OCR (Offensive CR) = Base Dmg CR + (Attack Adjustment)
Final CR = (DCR + OCR) / 2

Formula Source: D&D 5e SRD, Roll20 Compendium

Variables:

  • Hit Points: The average health of the creature across 3 rounds.
  • Armor Class: The base AC including natural armor or equipment.
  • Avg Damage: The mean damage dealt across the first 3 rounds of combat.
  • Attack Bonus: The modifier added to attack rolls (or use the Save DC if the primary threat is spells).

What is dnd 5e cr calculator?

The Challenge Rating (CR) system in Dungeons & Dragons 5th Edition is a numerical value that indicates the relative threat level of a monster. A party of four well-rested adventurers should find a monster with a CR equal to their level to be a worthy but non-lethal challenge.

Calculating CR involves two main pillars: Defensive CR (DCR), which measures survivability through HP and AC, and Offensive CR (OCR), which measures lethality through damage output and accuracy. By averaging these two values, DMs can ensure their encounters are balanced.

How to Calculate dnd 5e cr calculator (Example):

  1. Determine the Average HP (e.g., 100 HP = Base CR 3).
  2. Check Armor Class. If it’s 15 (Expected for CR 3 is 13), increase DCR by 1 per 2 points difference.
  3. Calculate Average Damage (e.g., 30 dmg = Base CR 4).
  4. Check Attack Bonus. If it matches the expected value for CR 4, the OCR remains 4.
  5. Average the results: (4 + 4) / 2 = CR 4.

Related Calculators:

Encounter Balance Tool Monster HP Scaler Ability Modifier Calc Spell Save DC Tool

Frequently Asked Questions (FAQ):

Why is my homebrew CR lower than expected? Most official monsters have specialized traits (like resistances) that effectively double their HP, leading to a higher DCR than raw HP suggests.
Does Save DC affect CR? Yes. If your monster uses Save DCs instead of Attack Rolls, you compare the Save DC to the “Expected Save DC” column in the DMG table to adjust OCR.
Should I round up or down? Official rules state you should round the final average to the nearest existing CR value (e.g., 1/8, 1/4, 1/2, 1, 2, etc.).
How do Resistances factor in? Resistance effectively increases a monster’s “Effective HP” based on its expected CR, making it much harder to kill.
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