NIKKE CP Deficit Calculator: Accurate Stat Penalty Calculations

What Is CP Deficit and Why It Matters

In Goddess of Victory: NIKKE, Combat Power (CP) determines your team's effectiveness in battle. When your Team CP is lower than the Stage CP (recommended CP for a stage), you receive a stat penalty that reduces your damage output, survivability, and overall performance.

The CP Deficit Calculator helps players understand exactly how much penalty they'll face at different deficit levels, allowing for better team composition decisions and resource allocation.

CP Deficit Formula:

CP Deficit = max(0, Stage CP - Team CP) / Stage CP

How the Calculator Works

The calculator uses a sophisticated piecewise function that combines lookup tables with power law formulas for maximum accuracy across all deficit ranges:

• Low Range (< 1% deficit): Lookup table handles the initial jump (5% penalty at 0.01% deficit) with binary search and linear interpolation
• Main Range (1% - 48% deficit): Power law formula with optimized coefficients (R² = 0.995062)
• High Range (> 48% deficit): Lookup table for accuracy at extreme values

Stat Penalty Formula (Main Range):

Stat Penalty = a × CP_Deficit^b
where a = 1.0399570265430915
      b = 0.478827201593444

The calculator automatically loads a lookup table with 501 data points covering 0.00% to 49.91% CP deficit. If the lookup table fails to load, it gracefully falls back to the power law formula.

Key Features

• Real-Time Calculations: Updates automatically as you type, with instant visual feedback
• Color-Coded Results: Green (low deficit), Yellow (minor), Orange (moderate), Red (severe) with pulse animation
• Input Validation: Validates CP values and provides clear error messages
• Responsive Design: Mobile-friendly, works on all screen sizes
• Self-Contained: All data files included in repository, no external dependencies
• Modular Architecture: Core logic separated into reusable JavaScript class
• Error Handling: Graceful error handling for edge cases and network failures

Data-Driven Accuracy

The calculator includes a complete dataset of 501 CP deficit and stat penalty data points (0.00% to 49.91% deficit). This dataset is self-contained in the repository and can be used to rebuild or refine the model in the future.

Model Performance:

• R² Score: 0.995062 (99.5% variance explained)
• RMSE: Optimized for the main range (1% - 48% deficit)
• Data Points: 501 points covering the most common deficit range
• Reproducibility: All data files included for future model refinement

The piecewise function provides excellent accuracy across all deficit ranges, with lookup tables ensuring precision at the edges where power law formulas may have slight variance.

Corrupted Theme Integration

The calculator is integrated with the corrupted-theme design system for a consistent, glassmorphic UI that matches nikkers.gg. The design features:

• Glassmorphic Design: Frosted glass effects with backdrop blur
• Video Background: Optional animated background (can be disabled)
• Responsive Layout: Mobile-first design that works on all devices
• Color System: Integrated color coding for deficit levels
• Animations: Smooth transitions and pulse effects for high deficits

Usage

Using the calculator is simple:

1. Enter Stage CP: The recommended CP for the stage you're attempting
2. Enter Team CP: Your actual team's total CP
3. View Results: The calculator automatically displays:
   • CP Deficit (as a percentage)
   • Stat Penalty (calculated with color coding)

The calculator works offline after the initial load, with all data files included in the repository. No build step is required—just open index.html in any modern web browser.

Technical Architecture

The calculator uses a modular, object-oriented architecture:

• CPDeficitCalculator Class: Core logic for validation, calculations, and color coding
• UI Controller: DOM event handling and input/output management
• Lookup Table Loader: Asynchronous loading of 501 data points
• Error Handling: Graceful fallbacks if lookup table fails to load

All code follows modern JavaScript standards (ES6+), with comprehensive unit tests ensuring reliability. The project is production-ready and optimized for deployment on nikkers.gg.

Open Source & Reproducibility

The calculator is fully open source with all data files included in the repository. This means:

• Reproducible Results: Anyone can verify the calculations using the included dataset
• Future Refinement: The dataset can be used to rebuild or refine the model as new data becomes available
• Transparency: All formulas, coefficients, and data points are documented and accessible
• Community Contributions: Contributions welcome for improvements, bug fixes, and feature additions

See the GitHub repository for full documentation, deployment guides, and contribution guidelines.

Ask Celeste

Q: How accurate is this calculator compared to in-game values?
A: The calculator achieves 99.5% accuracy (R² = 0.995062) in the main range (1% - 48% deficit) using a dataset of 501 data points. However, I recommend using it as a guideline and adjusting your team composition based on your in-game experience, as game mechanics may have hidden factors or special modifiers.

Q: Can I use this calculator offline?
A: Yes! After the initial load, the calculator works completely offline. All data files are included in the repository, so you can download it and use it without an internet connection.

Q: Will this work if the game updates and changes the stat penalty formula?
A: The calculator includes the full dataset (501 data points) in the repository, so you can rebuild or refine the model if game mechanics change. The model fitting scripts are included for this purpose.