Kenshi Weapon Strength Calculator

Few things are more frustrating in Kenshi than watching your elite warrior die because they're swinging a Meitou Fragment Axe like it's made of lead. In Kenshi, every melee weapon has a minimum Strength requirement. When your character's Strength falls below this threshold, they suffer a severe Combat Speed penalty that makes attacks painfully slow and leaves them vulnerable.

Understanding this mechanic is crucial for character progression, squad building, and combat effectiveness. The difference between meeting the Kenshi Weapon Strength requirement and falling short can mean life or death in Kenshi's unforgiving landscape.

Note: Meeting the Strength requirement only removes the penalty. To actually swing faster than the baseline speed, you need to train Dexterity — Strength determines whether you can wield a weapon effectively, while Dexterity determines how quickly you attack with it.

The full formula for weapon Strength requirements is:

$\text{Required Strength} = \max(\text{Blunt Damage} \times 40,\ \text{Weapon Weight})$

For most weapons with meaningful Blunt Damage, the Blunt Damage × 40 portion is larger. For cut-only weapons (katanas, nodachis) that have 0 Blunt Damage, the Strength requirement equals the weapon's weight — typically quite low.

This calculator implements the full formula. If you are using a cut-only weapon with 0 Blunt Damage, simply enter the weapon's weight to get the correct requirement.

Hacker (Standard) with 1.00 Blunt Damage: $\text{Required Strength} = 1.00 \times 40 = 40$

Falling Sun (Meitou) with 2.00 Blunt Damage: $\text{Required Strength} = 2.00 \times 40 = 80$

Fragment Axe (Meitou) with 3.60 Blunt Damage: $\text{Required Strength} = 3.60 \times 40 = 144$

Blunt Damage is one of two damage types in Kenshi (the other being Cut Damage). You can find a weapon's Blunt Damage value by:

1. Hovering over the weapon in your inventory
2. Examining weapons in shops or on the ground
3. Checking the weapon stats panel

The Blunt Damage value varies based on:

• Weapon type — Heavy weapons have higher Blunt Damage
• Weapon quality — Catun, Mk II, Edge Type 3, and Meitou grades affect stats
• Material — Different materials provide different stat bonuses

Important: Some weapon classes like katanas and nodachis have 0 Blunt Damage — they deal only Cut Damage. For these weapons, the Strength requirement is based on weapon weight.

Wielding a weapon with insufficient Strength causes severe penalties. Your character will experience the following drawbacks:

• Dramatically slower attack speed — Swings take significantly longer to complete
• Increased recovery time — The pause between attacks extends substantially
• Vulnerability window — Enemies can easily counterattack during slow animations

The penalty scales with how far below the requirement your Strength falls:

• 20+ stat points below: -47.5% Combat Speed (maximum penalty)
• 15 stat points below: approximately -37.5%
• 7 stat points below: approximately -17.5%
• At or above requirement: No penalty

Remember that your Current Strength is what matters, not just your base stat. In Kenshi, Strength is volatile:

• Injuries: Damage to the Chest, Stomach, or Arms reduces your effective Strength.
• Hunger: Severe hunger imposes a massive stat penalty.

Understanding exact Strength requirements for commonly used weapons helps you plan character progression. All values below are verified from game data via the Forgotten Construction Set (FCS).

Katanas and nodachis have 0 Blunt Damage — they are pure cutting weapons. Their Strength requirement is based on weapon weight, which is typically very low (4–10 kg depending on quality). This makes them ideal for characters with low Strength who want to remain effective in combat.

Sabre Advantage: Sabres provide a middle ground between katanas and heavier weapons. The Heavy Sabre offers excellent damage without prohibitive Strength requirements.

When to Choose Hackers: These weapons excel against heavily armored opponents. The higher Blunt Damage helps overcome armor bonuses that might nullify Cut Damage.

Heavy Weapon Strategy: The Meitou Fragment Axe is the most demanding weapon in Kenshi at 144 Strength — you'll need Industrial Lifter Arms on a Skeleton to realistically reach this. The Falling Sun is the lightest heavy weapon and uniquely favors Cut Damage over Blunt.

Weapon quality in Kenshi follows a progression that directly impacts Strength requirements:

1. Rusted — Significantly reduced stats
2. Old — Slightly below standard
3. Standard/Refitted — Baseline stats
4. Catun No. 1/2/3 — Improved stats
5. Mk I/II/III — Further improvements
6. Edge Type 1/2/3 — High-quality tier
7. Meitou — Legendary quality, best stats

Higher quality weapons typically have increased Blunt Damage, which raises the Strength requirement.

New players often equip the highest quality weapon they find without checking requirements. A character wielding a Meitou weapon with insufficient Strength will perform worse than with a Standard quality weapon they can handle. Always calculate requirements before equipping upgrades.

Different races in Kenshi have varying Strength multipliers. These differences affect which weapons they can use effectively. Here is how it works:

• Standard Strength progression
• Can eventually wield any weapon with training
• Shek naturally gravitate toward heavy weapons due to combat bonuses

• Soldier Drones: Standard Strength capability
• Worker Drones: Lower Strength ceiling, stick to lighter weapons
• Princes: Lower combat stats, best with katanas and light sabres

• Industrial Lifter Arms: Boost effective Strength significantly
• Economy Limbs: May reduce Strength
• Masterwork Limbs: Optimal Strength bonuses

Limb Replacement Strategy: Skeleton limb replacements modify your character's effective Strength stat directly — the modified value is what you see in your character stats and what the formula uses. Check your character panel after limb changes to recalculate weapon requirements.

Since Strength requirements can be quite high (up to 144 for the Meitou Fragment Axe), efficient training is essential:

Strength increases passively when you travel while encumbered. Every 1% encumbrance grants 1% Strength XP while walking. At 70%+ encumbrance, you gain up to 25% bonus XP.

Effective methods:

• Carrying unconscious bodies — Grants a separate +25% XP bonus that stacks with encumbrance, for a maximum 50% XP gain rate
• Filling inventory with ore, iron plates, or building materials
• Hauling items between locations

Some buildings contain Strength training equipment. While less efficient than carrying heavy loads, they provide a safe training environment.

Fighting also trains Strength based on encumbrance — every 1% encumbrance grants 1% Strength XP per hit.

Looking to optimize other survival games? Check out our Project Zomboid XP Calculator or see how your sensitivity translates with our Gaming Sensitivity Converter.

This calculator works both ways:

Finding Required Strength: If you have a weapon with known Blunt Damage, enter it to find the Strength needed.

Finding Maximum Weapon Blunt Damage: If you know your character's Strength, you can determine the maximum Blunt Damage weapon they can wield effectively by dividing Strength by 40.

Example: A character with 50 Strength can wield weapons up to 1.25 Blunt Damage without penalty (50 ÷ 40 = 1.25).

Start with lighter weapons that match your low Strength. Katanas are excellent early-game choices since they require very little Strength (based on weight only).

As your Strength increases, transition to sabres and hackers. Watch for quality upgrades that may change Strength requirements.

With high Kenshi Weapon Strength, heavy weapons become viable. The Falling Sun (80 Str) is more accessible than the Fragment Axe (144 Str for Meitou).

Consider varied Strength levels when equipping your squad. Not every character needs heavy weapons — a mix of weapon types can be strategically advantageous.

This calculator relies on the verified formula MAX(Blunt Damage × 40, Weapon Weight) derived from the game's code.

Important Notes:

• Modded Games: If you are using mods that alter combat mechanics or weapon stats (like "Sensible Blood Spider Range" or overhaul mods), these values might differ.
• Game Version: Calculations are accurate for the latest stable Kenshi release (v1.0.55+).
• Effective Strength: Remember that injuries, hunger, and robotic limbs affect your current effective Strength. Always calculate based on your current status panel number, not your base stat.