Does weightlifting or steady-state cardio burn more calories during the session?

Steady-state cardio (e.g. running or rowing at 8-10 METs) burns more total calories per minute during the session than traditional weightlifting (4.5-6.0 METs). However, resistance training preserves and builds metabolically active muscle tissue and elevates excess post-exercise oxygen consumption (EPOC).

What is the "constrained energy expenditure model" by Herman Pontzer?

Evolutionary anthropologist Dr. Herman Pontzer demonstrated that total daily energy expenditure does not scale linearly with high exercise volumes. Beyond a certain threshold, the human body adapts by suppressing energy spent on immune function, reproduction, and non-exercise movement to cap total daily burn.

How does bodyweight influence exercise calorie burn?

Caloric burn is directly proportional to bodyweight in weight-bearing exercises like running or walking, because moving an 85kg mass against gravity requires significantly more mechanical work than moving a 60kg mass over the same distance.

Does weightlifting or steady-state cardio burn more calories during the session?

Steady-state cardio (e.g. running or rowing at 8-10 METs) burns more total calories per minute during the session than traditional weightlifting (4.5-6.0 METs). However, resistance training preserves and builds metabolically active muscle tissue and elevates excess post-exercise oxygen consumption (EPOC).

What is the "constrained energy expenditure model" by Herman Pontzer?

Evolutionary anthropologist Dr. Herman Pontzer demonstrated that total daily energy expenditure does not scale linearly with high exercise volumes. Beyond a certain threshold, the human body adapts by suppressing energy spent on immune function, reproduction, and non-exercise movement to cap total daily burn.

How does bodyweight influence exercise calorie burn?

Caloric burn is directly proportional to bodyweight in weight-bearing exercises like running or walking, because moving an 85kg mass against gravity requires significantly more mechanical work than moving a 60kg mass over the same distance.

ZenFit Tools/performance/Calories Burned per Exercise Calculator

4 min readEnergy Expenditure

Calories Burned per Exercise Calculator

Name: Calories Burned per Exercise Calculator
Author: ZenFit Tools

Calculate exercise energy expenditure for 35+ sports and strength activities using the Compendium of Physical Activities MET database.

Formula: Calories = (MET × 3.5 × Body Mass in kg / 200) × Duration in Minutes

Input Parameters

Metric

Body Weight78 kg

Select Exercise / Activity

Duration45 mins

Instant Biometric Computation

Calculated Exercise Calorie Burn

369 kcal

Rate of burn: 8.2 kcal / minute (6 METs)

Exercise Compendium Note: This exercise expends 6 times the energy of sitting quietly at rest. Calorie estimates are derived from Ainsworth et al. 2011 physical activity compendium.

Export to Fitness Logs & Spreadsheets

Save this calculation for your training log: Apple Notes, Notion, Obsidian, Google Sheets, or Excel.

In-Browser Computation

How This Calculator Works & Mathematical Formula

Standard ACSM Metabolic Equation:

Calories Burned = [MET × 3.5 × Weight (kg) / 200] × Time (minutes)

Where 1 MET = 3.5 ml O₂/kg/min (resting oxygen uptake in a seated resting human). MET values are derived from Ainsworth et al. Compendium of Physical Activities.

Standard Physiological Guidelines & Scientific References

Clinical Society Guidelines

Ainsworth BE, et al. 2011 Compendium of Physical Activities: a second update of codes and MET values. Med Sci Sports Exerc. 2011;43(8):1575-1581.
American College of Sports Medicine (ACSM) Guidelines for Exercise Testing and Prescription (11th Edition).
Hall KD, et al. Energy balance and its components: implications for body weight regulation. Am J Clin Nutr. 2012.

Peer-Reviewed Citations

Ainsworth BE, et al. Med Sci Sports Exerc. 2011.
Bahr R, Sejersted OM. Effect of intensity on postexercise O2 consumption. Metabolism. 1991;40(8):836-841.

Formula Limitations, Safety Guidance & Doctor Consultation

Formula Limitations & Population Assumptions

•Wearable fitness trackers routinely overestimate exercise calorie burn by 25% to 40% (Stanford University evaluation of commercial wrist trackers).

•Do not "eat back" 100% of exercise calories burned if your objective is fat loss, as your body compensates by reducing subsequent spontaneous physical activity (constrained energy expenditure model).

When to Consult a Physician

Always consult a licensed medical professional before implementing significant changes to your caloric intake, fasting routine, hydration targets, or strenuous exercise programming. Seek immediate medical evaluation if you experience unexplained chest discomfort, irregular heartbeats, shortness of breath, dizziness, syncope, or if you have pre-existing cardiovascular, metabolic, renal, or endocrine conditions.

Educational Scope

Not medically reviewed. The results and estimates generated by this calculator are derived strictly from published population formulas and sports science research. They are intended for general athletic education and personal informational purposes only, and must never be construed as clinical diagnosis, medical prescription, or specialized healthcare advice.

Frequently Asked Questions (4 Technical Inquiries)

One MET represents the rate of energy expenditure while sitting quietly at rest, which equates to roughly 1 kcal per kilogram of bodyweight per hour, or 3.5 ml of oxygen consumed per kg per minute. An activity with a MET of 8.0 burns eight times more energy than resting.

More in Cardio & Strength

Complementary physiological calculations to refine your nutrition and programming.

View All Cardio & Strength →

5 min readPower & Strength

One-Rep Max (1RM) & Strength Standards Calculator

Calculate your maximum single-rep strength using 6 peer-reviewed formulas and view customized percentage-based training loads.

Brzycki, Epley, Lombardi, Mayhew, O'Conner, and Wathan empirical modelsCalculate

4 min readCardiovascular Suite

Target Heart Rate & Training Zones Calculator

Determine your 5 cardiovascular physiological training zones based on Tanaka age-predicted maximum and Karvonen Heart Rate Reserve.

Tanaka Max HR = 208 - (0.7 × Age) | Karvonen Target = Rest HR + [% × (Max HR - Rest HR)]Calculate

4 min readEndurance Science

Running Pace & Race Time Predictor

Convert split paces (min/km & min/mile) and predict 5K, 10K, Half, and Full Marathon times using Pete Riegel’s fatigue equation.

Riegel Fatigue Model: T2 = T1 × (D2 / D1)^1.06Calculate