About 5ehp.app

5ehp.app is a fast, lightweight tabletop math suite built for players and Dungeon Masters who want exact character-sheet numbers without fighting sign-up gates, bloated 30-second page loads, or ambiguous rules assumptions.

What This Suite Covers

Every tool on 5ehp.app focuses tightly on 5e character creation and combat survivability mathematics, running 100% client-side in your browser even when installed offline at a physical game table:

• 5e HP Calculator — Single-class and multiclass Hit Point calculation for 2024 and 2014 rules, Fixed Average vs. Rolled dice, Tough Origin Feat, Dwarf, Draconic Resilience, and Aid spell.
• 27-Point Buy & Standard Array Builder — Interactive 27-point ability allocator supporting 2024 Background (+2/+1 or +1/+1/+1) and 2014 Racial ASIs with one-click export to the HP and AC calculators.
• Armor Class (AC) Calculator — Light, Medium, and Heavy armor formulas, Shields, Barbarian & Monk Unarmored Defense, Mage Armor, Stealth warnings, and Strength checks.
• Short Rest Hit Dice Calculator — Mixed multiclass Hit Dice pools (d6 through d12) with 2024 full Long Rest recovery and 2014 half recovery comparisons.
• Temporary HP & Effective HP Calculator — Non-stacking Temp HP resolver, Aid and Heroes' Feast max-HP stacking, Damage Resistance mitigation, and Concentration DC checks.

Calculation Accuracy & Rules Methodology

Every formula on this website follows official System Reference Document math and published errata:

• Minimum 1 HP Per Level: When rolling or taking Fixed Average on level-up, your Hit Die + CON modifier contributes at least 1 Hit Point per level before species or feat bonuses apply.
• Retroactive Constitution Scaling: Changing Constitution affects every character level identically.
• Single Base AC Rule: Armor, Unarmored Defense, and Mage Armor are never summed together; only flat bonuses (Shields, Fighting Styles, Magic items) stack.

Open Gaming & Creative Commons Attribution (CC-BY-4.0)

5ehp.app includes material taken from the System Reference Document 5.1 ("SRD 5.1") and System Reference Document 5.2 ("SRD 5.2") by Wizards of the Coast LLC, available under the Creative Commons Attribution 4.0 International License (CC-BY-4.0). 5ehp.app is an independent utility and is not endorsed by or affiliated with Wizards of the Coast.