This tool calculates stealth kill success probabilities for video games, tabletop RPGs, and competitive gaming scenarios. It helps gamers, game designers, and streamers model RNG-based stealth mechanics. Adjust inputs to match your game’s current meta or patch values.
🗡️ Stealth Kill Probability Calculator
Model stealth kill success rates for video games, tabletop RPGs, and competitive play
Stealth Kill Probability Breakdown
Modifier Breakdown
How to Use This Tool
Follow these steps to calculate stealth kill probabilities for your game:
- Enter your base stealth success chance as a percentage (0-100) from your game’s base stats.
- Select the target’s current awareness level: Unaware targets have no penalty, while Hostile targets reduce success chance by 75%.
- Choose your attacker’s skill level to apply the correct multiplier for your character or unit.
- Select cover type and engagement distance to apply map or positioning-based modifiers.
- Add any additional modifiers (e.g., perk bonuses, debuffs) as a positive or negative percentage.
- Enter critical kill chance if your game has instant-kill critical hits on stealth attacks.
- Click the Calculate button to see the full probability breakdown, or Reset to clear all inputs.
Formula and Logic
The calculator uses a multiplicative and additive modifier system to model common gaming stealth mechanics:
- Adjusted Stealth Chance = (Base Chance / 100) × Target Awareness Multiplier × Attacker Skill Multiplier + Cover Bonus + Distance Penalty + Additional Modifier
- All values are clamped between 0% and 100% to reflect real game boundaries.
- Critical Kill Chance = Adjusted Stealth Chance × (Critical Kill Input / 100)
- Failure Rate = 100% - Adjusted Stealth Chance
This logic matches most video game and tabletop RPG stealth systems, where awareness and skill act as multipliers, while cover and distance are additive modifiers.
Practical Notes
Apply these gaming-specific tips to get accurate results for your use case:
- Base stealth chance values are often patch-dependent: check your game’s latest patch notes for updated base stats.
- Meta variations: competitive metas may prioritize high-skill attackers with heavy cover, so adjust inputs to match current meta trends.
- RNG factors: Most games use pseudo-random number generation, so actual results may vary slightly from calculated probabilities over small sample sizes.
- Tabletop RPGs: Use this tool to balance encounter stealth checks, ensuring success rates align with intended difficulty curves.
- Streamers: Use calculated probabilities to explain stealth success rates to viewers during gameplay.
Why This Tool Is Useful
Gamers, designers, and streamers benefit from this tool in multiple ways:
- Game designers can balance stealth mechanics by testing how modifier changes affect success rates across different skill levels.
- Competitive players can optimize builds by identifying which modifiers (skill, cover, distance) have the largest impact on kill probability.
- Streamers and content creators can provide data-driven explanations of stealth outcomes to their audience.
- Tabletop GMs can quickly calculate stealth check results without manual math, speeding up gameplay sessions.
Frequently Asked Questions
Does this calculator work for all video games?
This tool uses a generic stealth probability model that matches most modern video games and tabletop RPGs. For games with unique stealth mechanics (e.g., hidden RNG floors, conditional modifiers), you may need to adjust the additional modifier field to account for game-specific rules.
How do I find base stealth chance values for my game?
Base stealth chances are usually listed in your game’s skill description menu, official patch notes, or community-run wikis. For tabletop games, check the core rulebook’s stealth skill section.
Why is my adjusted chance higher than 100%?
The calculator clamps adjusted chances to 100% maximum, as no game allows a higher than 100% success rate. If your inputs result in a value over 100%, the tool will automatically cap it at 100% to reflect real game limits.
Additional Guidance
Use these best practices when working with stealth probability data:
- Test multiple scenarios: Run calculations for different awareness levels and cover types to understand how positioning affects success rates.
- Track patch changes: Re-calculate probabilities after game patches, as base stats and modifiers are often adjusted in updates.
- Combine with other tools: For tabletop games, pair this calculator with encounter balance tools to ensure stealth checks fit the intended difficulty.
- Share results: Use the copy-to-clipboard feature to share probability breakdowns with teammates or viewers.