If there's one number on your D&D character sheet that determines whether you survive the dragon's breath or become a crispy memory, it's your Hit Points (HP). HP is the ultimate resource — run out, and you're making death saves. Understanding every nuance of how HP works isn't just for min-maxers; it's the difference between a character who feels heroic and one who feels frustratingly fragile.

This ultimate guide covers everything about Hit Points in D&D 5e — from basic Level 1 calculations to advanced multiclassing scenarios, permanent bonuses, temporary HP, and death mechanics. Whether you're a first-time player or an experienced DM, you'll find answers to every HP question you've ever had.

Complete Hit Dice Table by Class

Every D&D 5e class uses one of four hit dice. The larger the die, the more HP you'll have:

Level 1 HP — Maximum Hit Die Explained

At Level 1, you get the maximum possible roll on your hit die. No rolling, no averages — just the highest number:

Examples:

• Barbarian (d12) + 16 CON (+3): 12 + 3 = 15 HP
• Cleric (d8) + 14 CON (+2): 8 + 2 = 10 HP
• Wizard (d6) + 12 CON (+1): 6 + 1 = 7 HP

HP at Higher Levels — Average vs Rolling

For every level after 1st, you have two choices:

Option A: Fixed Average (Recommended)

The "half + 1" rule gives you slightly above the true statistical average, making it the mathematically superior choice for long campaigns.

Option B: Roll Your Hit Die

Roll your hit die and add CON modifier. Exciting but risky — a single bad roll can permanently reduce your HP.

Permanent HP Bonuses — Tough, Hill Dwarf & More

These bonuses apply at every level and stack with each other:

• 🛡️ Tough Feat: +2 HP per character level. Retroactive — taking it at level 8 immediately grants 16 HP.
• ⛰️ Hill Dwarf (Dwarven Toughness): +1 HP per character level. Racial trait available from level 1.
• 🐉 Draconic Sorcerer (Draconic Resilience): +1 HP per Sorcerer level.

Multiclassing & Hit Points — Complete Rules

When multiclassing, you use the hit die of the class you're leveling up in:

• Level 1 HP is always based on your first class's maximum hit die
• Each subsequent level uses the hit die of whichever class you're taking
• CON modifier applies to every level regardless of class
• Tough feat and Hill Dwarf bonuses apply to total character level

Constitution — Why It's the Most Important Ability

Constitution is the only ability score that matters for every single class. Here's why:

• +1 CON modifier = +1 HP per level. At level 20, that's 20 HP from one ability point.
• +2 CON vs +0 CON at level 20 = 40 HP difference. That's the entire HP pool of a level 5 character.
• CON also affects Concentration saves for spellcasters and resistance to poison, cold, and disease.

Temporary HP — What It Is and How to Get It

Temporary HP (THP) is a buffer that sits on top of your regular HP. When you take damage, THP is lost first. Key rules:

• THP does not stack. If you have THP and gain more, you choose which to keep.
• Not "real" healing. THP cannot bring you back from 0 HP.
• Lasts until depleted or after a long rest.

Best sources: Armor of Agathys (Warlock), False Life, Twilight Cleric's Channel Divinity, Heroism spell, Chef feat, Inspiring Leader feat.

Death Saves & What Happens at 0 HP

When you drop to 0 HP, you fall unconscious and begin making Death Saving Throws:

• Roll a d20 at the start of each of your turns
• 10 or higher = success. 3 successes = stable (but unconscious)
• Below 10 = failure. 3 failures = death
• Natural 20 = regain 1 HP and wake up immediately
• Natural 1 = counts as two failures
• Taking any damage while at 0 HP = automatic failure (critical hit = 2 failures)

Pro Tips for Maximizing Your Survivability

1. Prioritize CON early. A 14-16 CON at level 1 provides compounding benefits over 20 levels.
2. Take the average, not the risk. Fixed average is mathematically superior for long campaigns.
3. Stack permanent bonuses. Hill Dwarf + Tough feat = +3 HP per level — an extra 60 HP by level 20.
4. Always have a THP source. Even 5 THP from False Life can absorb a hit that would otherwise knock you unconscious.
5. Use our calculator. Our D&D HP Calculator handles all formulas, bonuses, and multiclassing instantly.

Frequently Asked Questions

Q: What happens if my CON modifier changes mid-campaign?

If your CON modifier permanently increases (ASI, magic item), your max HP is retroactively increased by 1 per character level per modifier point. A +1 CON increase at level 8 = +8 max HP.

Q: Does the Tough feat apply to levels you already have?

Yes. Tough grants +2 HP per level retroactively. Taking it at level 12 gives you +24 HP immediately (2 × 12).

Q: Can I change from rolling to average mid-campaign?

By RAW, no — you're locked in. Most DMs will allow retroactive switching to average if your rolled HP is significantly below par. Always discuss with your DM.

Q: What's the maximum HP possible in D&D 5e?

A Level 20 Hill Dwarf Barbarian with 24 CON (+7), Tough feat, and max rolls on every hit die reaches 440 HP. With average method: ~345 HP. Add the Berserker Axe for +1 HP per level to push even higher.