Siege Battle Power Calculator

How to Use This Tool

Follow these steps to generate accurate siege battle power estimates:

• Enter the total base power of all attacking units (excluding siege engines) in the Attacker Base Unit Power field.
• Enter the total base power of all defending units in the Defender Base Unit Power field.
• Input the number of siege engines (catapults, trebuchets, battering rams) and their individual power output.
• Select the defender’s defensive structure from the dropdown to apply the correct bonus multiplier.
• Choose the attacker’s morale state, terrain type, and game type to adjust scaling for your specific use case.
• Click the Calculate Power button to view the full breakdown of battle stats and win probabilities.
• Use the Reset Form button to clear all inputs and start a new calculation.

Formula and Logic

This calculator uses a modified ELO-based power system tailored for siege battles, with adjustments for common gaming balance factors:

• Attacker Total Power = (Base Attacker Power + (Siege Engine Count × Power Per Siege Engine)) × (1 + Morale Modifier) × (1 + Terrain Modifier) × Game Type Scaling Factor
• Defender Total Power = Base Defender Power × (1 + Defensive Structure Bonus) × Game Type Scaling Factor
• Win Probability uses a logistic function: 1 / (1 + 10^((Defender Power - Attacker Power) / 400)) × 100, a standard model for competitive matchmaking systems.
• Game type scaling adjusts for variance: Tabletop RPGs add 20% variance to account for dice roll RNG, Competitive MOBAs reduce variance by 10% for standardized balance, RTS Strategy adds 10% for resource scaling.

Practical Notes

Apply these gaming-specific considerations to get the most accurate results for your use case:

• Meta variations: Power values shift with game patches—update base unit power inputs after balance changes to reflect current meta.
• RNG factors: Tabletop and some video games include random critical hits or miss chances—use the Tabletop RPG game type to account for higher variance.
• Performance scaling: Competitive players should use the Competitive MOBA setting to align with tournament-standard balance rules.
• Siege engine durability: This calculator assumes all siege engines are operational—reduce siege count input if engines are damaged or destroyed during battle.
• Defensive structure decay: Wooden palisades may lose 5-10% bonus after repeated siege attacks—adjust structure selection mid-battle for dynamic scenarios.

Why This Tool Is Useful

This tool solves common pain points for gaming stakeholders:

• Gamers can test siege loadouts before committing resources in-game, saving time and in-game currency.
• Game designers can balance siege mechanics, unit stats, and defensive structures during development to avoid overpowered or underpowered setups.
• Streamers and content creators can generate accurate battle predictions for live casts or strategy guides.
• Competitive players can prep for tournaments by modeling opponent siege strategies and adjusting their own loadouts accordingly.

Frequently Asked Questions

What game types does this calculator support?

This tool supports Video Game (standard RTS and strategy games), Tabletop RPG (D&D, Pathfinder siege scenarios), Competitive MOBA (tournament-standard balance), and RTS Strategy (classic real-time strategy games). Each type applies a unique scaling factor to account for genre-specific balance rules.

How accurate are the win probabilities?

Win probabilities use a modified ELO logistic function, which is standard for competitive matchmaking. However, they do not account for player skill, RNG (unless using Tabletop RPG scaling), or real-time tactical decisions—use them as a baseline, not an absolute prediction.

Can I adjust for patch changes?

Yes—simply update the base unit power, siege engine power, and defensive bonus inputs to reflect the latest game patch values. The calculator’s core logic remains stable across patches, so only input values need updating.

Additional Guidance

Follow these best practices for consistent results:

• Always use the same power scaling system for attacker and defender inputs (e.g., if using 1-10 power per unit, apply that to both sides).
• Test multiple terrain and morale combinations to model different battle scenarios (e.g., attacker with hill advantage vs. low morale).
• For tabletop games, roll a d20 to add ±5% variance to final power totals to simulate dice RNG.
• Save common loadouts (e.g., tournament-standard siege setups) in a separate document to speed up repeated calculations.