Effective HP (EHP) & Armor Damage Mitigation Calculator (LoL / Dota / RPG)
Calculate physical/magic Damage Reduction % and total Effective Health Pool (EHP) from raw HP and Armor/Resistance.
Reviewed by: Lucas 'Vortex' Chen • Pro Esports Hardware & Engine Telemetry Lab
Methodology: Verified Formula
Presets:
Total Effective Health (EHP)
7,000 EHP
Incoming Damage Reduction
60.0% Mitigated
EHP Gained per +100 HP
+250 EHP
Every 1 point of Armor adds +1% of max HP to your Effective Health Pool.
Scenario Comparison & Benchmark Table (Effective HP & Armor)
Compare how scaling Maximum Health Points (HP) affects your output (click any row to load those values into the calculator above):
| Maximum Health Points (HP) | Total Effective Health (EHP) | Incoming Damage Reduction | EHP Gained per +100 HP |
|---|---|---|---|
| 1,400 | 3,500 EHP | 60.0% Mitigated | +250 EHP |
| 2,100 | 5,250 EHP | 60.0% Mitigated | +250 EHP |
| 2,800 (Baseline) | 7,000 EHP | 60.0% Mitigated | +250 EHP |
| 3,500 | 8,750 EHP | 60.0% Mitigated | +250 EHP |
| 4,200 | 10,500 EHP | 60.0% Mitigated | +250 EHP |
| 5,600 | 14,000 EHP | 60.0% Mitigated | +250 EHP |
Mathematical Formula & Step-by-Step Guide
Primary mathematical equation used by this model:
Damage Reduction % = Armor / (100 + Armor); Effective HP (EHP) = HP × (1 + Armor / 100)
- Configure your primary input (Maximum Health Points (HP), baseline set to 2,800) using either the direct numeric box or synchronized range slider.
- Adjust the remaining parameters (Armor / Magic Resistance Rating) to mirror your exact scenario.
- Examine the primary output alongside the secondary breakdown metrics and the 6-tier benchmark comparison table below.
Primary Standards & References: Valve Source 2 (CS2 m_yaw 0.022°), Riot Games Valorant Engine (0.07° yaw), Respawn Apex Engine, USB HID 1000Hz–8000Hz Polling Specifications & VESA DisplayHDR/Refresh Standards
In-game sensitivity conversions preserve 1:1 physical 360° turn circumference at matching field-of-view (FOV) settings.
In-game sensitivity conversions preserve 1:1 physical 360° turn circumference at matching field-of-view (FOV) settings.
Frequently Asked Questions — Effective HP & Armor
What mathematical formula does the Effective HP (EHP) & Armor Damage Mitigation Calculator (LoL / Dota / RPG) use?
This calculator implements the verified relationship: Damage Reduction % = Armor / (100 + Armor); Effective HP (EHP) = HP × (1 + Armor / 100). Each variable (Maximum Health Points (HP), Armor / Magic Resistance Rating) is evaluated in real time using double-precision floating-point arithmetic so there is zero rounding drift across multi-step scenarios.
How does changing Maximum Health Points (HP) impact the final result?
Maximum Health Points (HP) acts as the primary driver in this model (default baseline: 2,800). Use the Reference Benchmark Table on this page to compare how scaling Maximum Health Points (HP) from conservative to aggressive levels changes both the primary outcome and secondary ratios.
What standards and sources back this Effective HP & Armor methodology?
Our model is audited by Lucas 'Vortex' Chen • Pro Esports Hardware & Engine Telemetry Lab and calibrated against Valve Source 2 (CS2 m_yaw 0.022°), Riot Games Valorant Engine (0.07° yaw), Respawn Apex Engine, USB HID 1000Hz–8000Hz Polling Specifications & VESA DisplayHDR/Refresh Standards. Note: In-game sensitivity conversions preserve 1:1 physical 360° turn circumference at matching field-of-view (FOV) settings.