Understanding Calories Burned During Exercise

Estimating calories burned during physical activity is more complex than estimating resting calorie needs. Exercise calorie calculations depend on the type and intensity of movement, your body weight, and the duration — all captured in the MET formula used by this calculator.

MET values (Metabolic Equivalents of Task) are the industry standard for quantifying exercise intensity. They appear in clinical research, fitness guidelines, and commercial fitness trackers. Understanding MET values helps you compare the energy cost of different activities and plan your exercise program more effectively.

Comparing Activity Intensity by MET

Factors That Affect Actual Calorie Burn

The MET formula gives a solid estimate but cannot account for every individual variable. Several factors cause actual calorie burn to differ from the formula:

• Fitness level: Trained athletes are more efficient — they burn slightly fewer calories for the same task than untrained individuals.
• Terrain and conditions: Running outdoors or uphill burns more than a flat treadmill at the same speed.
• Temperature: Exercising in the heat or cold requires additional energy for thermoregulation.
• Technique: Proper form in strength training vs. sloppy form changes the muscular demand significantly.

For most practical purposes — tracking approximate energy expenditure for diet planning — MET estimates are sufficiently accurate. Treat them as useful benchmarks rather than precise measurements.