How to Use This Tool

Follow these steps to generate accurate stealth kill probability estimates for your game session or design project:

1. Enter your character’s Stealth Skill as a value between 0 and 100, where 100 represents maximum stealth proficiency.
2. Select the enemy’s current Awareness Level from the dropdown, matching their in-game state (Unaware, Suspicious, etc.).
3. Choose the Environmental Cover type that applies to your current position relative to the target.
4. Select your Attack/Weapon Type to apply the correct modifier for your chosen kill method.
5. Enter the Distance to Target and Target Detection Range using the same unit, then select the unit type for reference.
6. Add any Buff/Debuff Modifiers as a percentage (e.g., +20 for a stealth potion, -15 for an enemy that is stunned).
7. Click the Calculate Probability button to view your detailed breakdown, or Reset to clear all fields.

Formula and Logic

This calculator uses a weighted modifier system common in tabletop RPGs and video game stealth mechanics:

• Base probability is equal to your Attacker Stealth Skill value (0-100%).
• Penalties and bonuses are applied additively from enemy awareness, cover, attack type, distance, and buffs/debuffs.
• Distance penalty is calculated as (Distance / Detection Range) * 30%, capped at a maximum 30% penalty for targets outside detection range.
• Final probability is clamped between 0% and 100% to reflect real game boundaries.
• Critical success chance is calculated for probabilities above 70%, critical failure for probabilities below 30%.

Note that many games use proprietary RNG (random number generation) systems that may adjust these values slightly. Always check your game’s latest patch notes for stealth mechanic changes.

Practical Notes

Stealth mechanics vary widely across games, so keep these context-specific tips in mind:

• Meta shifts: Popular stealth builds may be adjusted in balance patches, so re-calculate probability after major updates.
• RNG variance: Most games roll stealth checks independently per attempt, so a 90% probability still carries a 10% failure risk per try.
• Performance scaling: Some games adjust stealth detection based on your hardware performance or server tick rate in multiplayer titles.
• Tabletop games: Dungeon Masters may apply additional discretionary modifiers not included in this calculator, so use results as a baseline.
• Multiplayer: Enemy players may use stealth detection perks or abilities that override standard detection ranges.

Why This Tool Is Useful

This calculator serves multiple use cases for gaming enthusiasts:

• Competitive players can optimize stealth build stats to maximize kill success rates in ranked modes.
• Game designers can balance stealth mechanics by testing probability ranges for different character and enemy configurations.
• Streamers can use real-time probability estimates to explain stealth outcomes to their audience during gameplay.
• Tabletop players can resolve stealth kill attempts quickly without manual math during sessions.

Frequently Asked Questions

Does this calculator work for all video games?

No, this tool uses generalized stealth mechanics common to most RPG and shooter titles. Always check your game’s specific stealth rules, as some use hidden stats or proprietary RNG systems not accounted for here.

How do I calculate distance for games without unit markers?

Use the game’s built-in measurement tools if available, or estimate using character height (most game characters are ~1.8 meters tall) to approximate distance in meters.

Why is my probability capped at 100% or 0%?

Real stealth systems cannot have a success rate above 100% (guaranteed success) or below 0% (impossible success). The calculator clamps results to this range to reflect in-game reality.

Additional Guidance

For the most accurate results, always use the latest game patch values for stealth skills and detection ranges. If playing a tabletop game, confirm with your Dungeon Master which modifiers they apply to stealth checks before using calculator results. Save your most used configurations by copying results to your clipboard for quick reference during long sessions.