The short answer
A 70 kg grappler burns roughly 420 calories in an hour of drilling (MET 6), and closer to 790 in an hour of hard rolling (MET 11.3). Most classes mix both, so a real session usually lands in between. Lighter people burn less, harder rounds burn more. The chart and calculator below break it down by your exact weight, intensity, and time.
Brazilian jiu-jitsu is one of the harder workouts to put a single number on, because no two rounds are the same. A technical drilling session and a competition-round scramble can happen in the same hour, and they burn wildly different amounts. So "calories burned in BJJ" is really a range, set by your weight, how live the training is, and how long you last.
The science behind the numbers is the MET (metabolic equivalent). Each intensity has a MET value from the 2024 Adult Compendium of Physical Activities, and the formula is simple: calories = MET x your weight in kilograms x hours. We did that math for every common weight and intensity below.
How many calories does BJJ burn?
Pick the row for your training time and the column for your weight. Easy is drilling and technique work around MET 5.3, moderate is positional rolling at a controlled pace around MET 6, and fast is hard competitive sparring around MET 11.3, on par with high-intensity judo. The more live your rounds, the higher the MET, and the more you burn for the same time.
Why your weight matters
Grappling is a full-body fight against another person's mass and your own, so the heavier you are, the more energy every scramble, bridge, and shrimp costs. That is why each row in the table rises as you move right across the weight columns. A 100 kg grappler burns close to twice the calories of a 55 kg training partner in the same round, simply because there is more body to move and defend. It is also why weight classes exist: the physics changes with mass.
Why intensity changes the number
Nothing swings the burn like whether you are drilling or rolling. Drilling is deliberate and paced, sitting near MET 5.3, while live rolling is a stack of near-maximal efforts, spiking toward MET 11.3 during hard exchanges. Going from a technique class to a full open mat can more than double your burn for the same clock time. The honest caveat: rolling is intermittent, with bursts of scramble and moments of grinding control, so treat the fast number as an average across a genuinely hard round, not every second of the mat.
Why weight cutting makes the numbers matter
BJJ has a competition culture built around weight classes, and that changes how you should read a calorie chart. Grapplers preparing for a tournament often try to lean out without losing strength or gassing on the mat, which is a narrow target. Burn too aggressively and your rounds fall apart; eat too loosely and you miss weight. Knowing your real training burn, round by round, is what lets you cut sensibly instead of crash dieting the week before you compete.
Calories burned vs calories eaten
Knowing you burned 500 calories at open mat is only half the picture. What you do with that number is what changes your weight and your performance. Hard training drives appetite up, and it is easy to eat back an entire session without noticing, especially after evening classes. The useful move is to connect the burn to your intake for the day, which is exactly the gap a coach fills.
Log your BJJ sessions without the math
Reading a chart is one thing. Tracking every session, after every late class, when your grips are shot and you just want to eat, is where most people quit. With CalAlly you say "I rolled for 45 minutes" and it logs the session, estimates the burn, and folds it into your daily numbers. The built in AI nutrition coach then tells you what to eat to recover and, if you are cutting for a competition, how to lean out without gassing on the mat. See what CalAlly is, the best calorie tracker for BJJ, or our best calorie tracker apps roundup.
