Effective Armor Formula

Name: Effective Armor Formula
Author: ledokua

Effective Armor Formula changes how worn armor reduces incoming damage on the server, swapping vanilla's armor calculation for a different one.

FabricServer-side onlyMIT LicenseOpen source1.20 – 1.21.11

What it does

The Effective Armor Formula mod swaps vanilla's armor calculation for the Effective Health approach, the one used in League of Legends. Each point of armor adds a steady 1% of effective HP against physical damage, with no falloff, which makes armor values easier to read and balance. The mod runs on the server alone, so players join without installing anything. It is published for Fabric with no required dependencies, under the MIT License, and is open source, with files for 1.20 – 1.21.11 and the latest one for 1.21.11.

Key features

Effective Health formula
Replaces vanilla armor reduction with the Effective Health approach used in League of Legends.
Consistent armor scaling
Each armor point adds a steady 1% of effective HP against physical damage, with no falloff.
Armor penetration support
Works with add-ons that bring armor penetration or shred effects, according to the author.

Compatibility

Latest build for each game version and loader.

Version

1.21.x12 of 12 versions with builds

1.21.111.0-SNAPSHOT

1.21.101.0-SNAPSHOT

1.21.91.0-SNAPSHOT

1.21.81.0-SNAPSHOT

1.21.71.0-SNAPSHOT

1.21.61.0-SNAPSHOT

1.21.51.0-SNAPSHOT

1.21.41.0-SNAPSHOT

1.21.31.0-SNAPSHOT

1.21.21.0-SNAPSHOT

1.21.11.0-SNAPSHOT

1.211.0-SNAPSHOT

1.20.x7 of 7 versions with builds

ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Questions

Does Effective Armor Formula need to be installed on the client?

No. Only the server needs it, and players join without installing anything.

In the catalog

Effective Armor Formula is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 19,862 mods support Minecraft 1.21.11.

Game mechanics mods29,952 Fabric mods Mods for 1.21.1119,862

More from ledokua

All projects

Arenas_LD1.21 – 1.21.11

Potions_LD1.21.1 RCResistance Controller1.21.1

Similar mods

Better Third Person1.16.4 – 1.21.8

Sounds1.20 – 26.3

Cut Through1.18.2 – 26.3

Bad Wither No Cookie - Reloaded1.12.2 – 1.21.10

Carpet1.14.4 – 26.3

Client Tweaks1.12.2 – 26.3

What the author says

This mod replaces Minecraft's default armor calculation with the popular "Effective Health" formula, similar to the one used in games like League of Legends. Instead of offering diminishing returns, every point of armor now consistently adds 1% to your effective HP against physical damage. This makes armor values…

ledokua, on the Modrinth page

Official listing

Modrinth page: modrinth.com/mod/effective-armor-formula
Owner: ledokua
Published: 2026-02-24
Updated on Modrinth: 2026-02-24
Facts verified: 2026-10-15