how heavy would roronoa zoro from one piece weigh if he had a prosthetic arm and leg like edward elrick from full metal alcamist

June 28, 2026

Quick Scoop

If Roronoa Zoro had one automail arm and one automail leg like Edward Elric , his weight would likely increase by ~10–25 kg (22–55 lbs) depending on material and build. That would put him roughly in the range of 105–125 kg (231–276 lbs) instead of his canon ~85–90 kg.

Baseline: Zoro’s Canon Build

Zoro is already extremely dense and muscular.

Height: ~181 cm (5'11")
Weight: ~85–90 kg (187–198 lbs)
Body type: Heavy muscle mass, low fat, combat-conditioned

Unlike average humans, anime physics suggest his muscles are denser than real-world equivalents , so even small changes matter.

What Edward Elric–Style Automail Adds

Edward’s automail is not lightweight prosthetics—it’s essentially full-metal mechanical limbs.

Realistic Weight Estimates

Human arm: ~3.5–4.5 kg
Human leg: ~10–12 kg
Automail arm (steel-like): ~8–12 kg
Automail leg (reinforced): ~20–30 kg

Net Gain

Arm replacement: +4–7 kg
Leg replacement: +10–18 kg

Total added weight: ~14–25 kg

Adjusted Weight Range for Zoro

Putting it together:

Original: ~85–90 kg
With automail:
- Low estimate: ~100 kg
- High estimate: ~115–125 kg

Given Zoro’s absurd strength and durability, he’d likely opt for heavier, combat-grade automail , pushing him toward the upper end.

Anime Logic vs Real Physics

Here’s where things get fun:

In Fullmetal Alchemist , automail is heavy but optimized for mobility.
In One Piece , characters routinely carry ridiculous weight without penalty.

So in-universe:

Zoro wouldn’t slow down
His strikes might actually hit harder due to added limb mass
His endurance would barely be affected

Multi-View Perspective

1) Real-World Physics View

Extra weight = more energy required to move
His fighting style would become slightly more grounded and force-based

2) Anime Scaling View

Weight becomes an advantage
Automail could act like built-in weighted training gear

3) Fan Theory Angle (Trending Discussion Style)

“Zoro would basically be training at all times. Remove the automail and he’d move like Rock Lee dropping weights.”

Final Take

Zoro with Edward Elric–style prosthetics would most likely weigh between 105 and 125 kg , depending on how heavy-duty the automail is. In practical terms, that added mass would probably make him even more dangerous , not less.

TL;DR

Base Zoro: ~85–90 kg
Automail adds: ~14–25 kg
New weight: ~105–125 kg (231–276 lbs)
Effect: Heavier, but likely stronger in combat

Information gathered from public forums or data available on the internet and portrayed here.