5e Maker · D&D 5e Encounter Builder & CR Calculator
Calculate 2014 Basic Rules encounter difficulty, add saved stat blocks, then generate terrain and tactical ideas to review.
Deterministic encounter math
Uses the 2014 Basic Rules encounter thresholds and multiple-monster multipliers. It does not mix in the different 2024 encounter-budget method.
Difficulty
Easy
Awarded XP
900
Difficulty XP
1,350
Multiplier
×1.5
| Easy | Medium | Hard | Deadly |
|---|---|---|---|
| 1,000 | 2,000 | 3,000 | 4,400 |
Awarded XP is the raw monster total. Difficulty XP applies the ×1.5 multiplier for 2 monsters and a party of 4; it is only for encounter classification.
Rules source: D&D Beyond Basic Rules (2014), Building Combat Encounters. Situational advantages, surprise, terrain, and party composition still require GM judgment.
AI encounter draft
Describe the party and scene. The AI result is a separate creative draft; verify its numbers with the calculator above.
No signup required · 1 free encounter draft per day · Review mechanics before play
Not affiliated with Wizards of the Coast. Uses SRD 5.1 under CC-BY-4.0.
Deterministic example
The calculator separates the arithmetic from the GM judgment that determines whether the encounter will actually feel fair.
This page uses the 2014 Basic Rules calculation. It does not mix in the different 2024 encounter-building method.
A deterministic 5e encounter calculator plus an optional AI drafting tool. Add mixed-level party groups and monsters to calculate raw XP, multiple-monster adjusted XP, and easy, medium, hard, or deadly thresholds using the 2014 Basic Rules method. Signed-in users can add their saved stat blocks directly. Then use AI for tactics, terrain, and encounter flavor, while treating party composition and situational advantages as GM judgment rather than a mathematical guarantee.
When to use it
How it works
Add one or more character groups so mixed levels and party sizes use the correct 2014 XP thresholds.
Enter CR and count manually, or load a monster you previously reviewed and saved.
Use adjusted XP as a starting point, then account for terrain, surprise, resources, and party composition.
Related tools
Generate structured 5e monster drafts with stat blocks, abilities, and optional lair actions — then review the mechanics before play.
Turn an original monster idea into a structured draft, edit every field, save it to your account, and reuse it in the encounter builder.
Create and review an editable stat block, save it to your account, and select it inside the encounter builder.
Create a reusable monsterRunning games every week? Go Pro for 100 generations/mo & commercial-use rights →