40k Damage Calculator | MathHammer for Warhammer 40k 10th Edition

⚔️ Attacker

Number of models

Attacks per model

Weapon Skill / Ballistic Skill (2+)

Strength (S)

Armour Penetration (AP)

Damage per hit

Lethal Hits (auto-wound on critical hit)

Sustained Hits (extra hit on critical)

Devastating Wounds (mortal wounds on critical wound)

Hit roll reroll

Wound roll reroll

🛡️ Defender

Toughness (T)

Save characteristic (Sv)

Invulnerable save (if any)

Feel No Pain (FNP)

Wounds per model

Damage halved (round up)

Save reroll

Feel No Pain reroll

🌐 Global Modifiers

Hit roll modifier

Wound roll modifier

Save roll modifier

0.00

Average Total Damage

Median Damage

Max Damage

Min Damage

0.00

Standard Deviation

Chance to kill 1 model

Chance to wipe unit

⚡ Based on 10,000 Monte Carlo simulations. Accounts for critical hits/wounds, rerolls, modifiers, FNP, and damage reduction.

Advanced 40k MathHammer Calculator

This Warhammer 40,000 damage calculator simulates thousands of attack sequences to give you accurate expected damage, variance, and kill probabilities. It supports all core 10th edition rules: Lethal Hits, Sustained Hits, Devastating Wounds, rerolls (full or 1s), modifiers to hit/wound/save, Feel No Pain, damage halving, and invulnerable saves.

Why Use Monte Carlo Simulation?

Unlike simple averages, our simulation captures the randomness of dice. You'll see not just the mean damage, but also the distribution — crucial for understanding if a unit can reliably delete a key target. The "Chance to kill" metrics are far more valuable than average damage alone when planning your 40k strategy.