He is basically a human tectonic plate. Most people know Hafthor Bjornsson as the guy who popped a man's head like a grape in Game of Thrones, or maybe as the dude who pulled a literal steam train. But when you get into the weeds of the Hafthor Bjornsson height weight discussion, things get surprisingly complicated.
It isn't just a static set of numbers. It’s a shifting baseline of human biology pushed to the absolute brink.
The 6'9" Question: How Tall is Thor, Really?
In the world of pro sports, height is often a bit of a "marketing" number. You see it in the NBA all the time where a 6'1" guard magically becomes 6'3" on the official roster. With Thor, the 205 cm (6'9") figure has been the gold standard for over a decade. It's the number that makes him "The Mountain."
But honestly? There’s a bit of nuance there.
He once admitted in a casual conversation with a fan that he’s actually closer to 6'8" (203 cm). Does an inch matter when you weigh as much as a small car? Probably not to the average person, but in the world of physics and leverage—where he lives—that height is everything. His father, Björn Reynisson, is 6'8", and his grandfather was even taller. The height is in the marrow of his bones.
When you stand next to him—which I've seen people do at the Arnold Classic—he doesn't just look tall. He looks wide. His frame is so massive that the 6'9" frame feels more like an optical illusion. You aren't looking at a tall man; you're looking at a structural pillar.
The Weight Rollercoaster: 450 lbs to 330 lbs and Back
The Hafthor Bjornsson height weight relationship is less of a straight line and more of a jagged EKG. At his absolute peak strongman bulk—think 2020, when he deadlifted that mind-bending 501 kg (1,105 lbs)—he was tipping the scales at 205 kg, which is roughly 452 pounds.
Imagine carrying that much mass.
He has talked about how miserable it was. Breathing was hard. Sleeping was hard. Every step felt like a workout. To maintain that weight, he was shoving 10,000 calories down his throat every single day. We aren't talking about pizza and donuts here. It was "The Vertical Diet"—steak, white rice, bone broth, and spinach, repeated until his jaw literally tired of chewing.
Then the boxing era happened.
To fight Eddie Hall in 2022, he dropped down to a "svelte" 152 kg (335 lbs). He looked like a different species. The abs were out. He was moving with a fluidity we hadn't seen since his early days as a basketball player in Iceland. This is where most fans get confused. They see a picture of him shredded from two years ago and think he’s small now.
He isn't.
By early 2026, Thor has swung the pendulum back toward strength. He realized his heart—and his passion—was in the heavy stuff. Recent weigh-ins and training updates show him back in the 180–190 kg (397–418 lbs) range. He’s found a middle ground where he’s still terrifyingly strong but isn't gasping for air just sitting on the couch.
The Biology of Being The Mountain
You can't talk about his weight without talking about what it does to the body. Stan Efferding, his longtime nutritionist, once noted that the hardest part of Thor's diet wasn't the training—it was the digestion.
🔗 Read more: Men's NCAA Soccer Tournament: Why the 48-Team Chaos Actually Works
- The Vertical Diet: Focuses on low-FODMAP foods. This means no broccoli or cauliflower because they cause gas, and when you eat as much as he does, gas becomes a medical emergency.
- Blood Pressure: At 450 lbs, his body was under immense strain. The weight loss for boxing wasn't just for speed; it was a "reset" for his internal organs.
- The Skeleton: Carrying 400+ lbs for years compresses the spine. It’s why some people swear he’s "shrunk" over time.
He’s currently eating about 8,000 calories a day. He calls himself "old and lazy" now because he isn't hitting the 10k mark anymore, which is hilarious given that 8,000 calories would make most humans explode. His breakfast alone—six eggs, a mountain of flank steak, and a massive bowl of cream of rice—is more than most people eat in a full day.
What This Means for You
Unless you’re planning on pulling a Boeing 747, you probably shouldn't try to replicate the Hafthor Bjornsson height weight ratio. However, there are some real-world takeaways from how he manages his mass.
- Prioritize Digestion: Thor avoids foods that make him bloated, even if they're "healthy." If a food makes you feel sluggish or gassy, it’s not working for you, regardless of the macros.
- The Power of Salt: He adds a massive amount of sodium to his meals to manage his blood pressure and keep his muscles hydrated. Most people are afraid of salt, but for high-level athletes, it’s a performance enhancer.
- Cycle Your Goals: He didn't stay at 450 lbs forever. He leaned out, gave his heart a break, and then built back up.
If you're tracking your own progress, stop obsessing over the scale as a static number. Thor's weight changes based on his mission. If he’s boxing, he’s light. If he’s pulling a world record deadlift, he’s a giant. Your weight should follow your function, not the other way around.
Check your own resting heart rate and blood pressure before trying to bulk up to "Mountain" levels. Mass is a tool, but if you don't have the cardiovascular health to support it, it becomes a liability. Focus on vertical dieting principles—whole foods, easy digestion—to see how your own body responds to clean fueling.