{
  "slug": "activity-comparison",
  "title": "Activity Calorie Comparison Calculator",
  "category": "Energy Expenditure",
  "category_slug": "energy-expenditure",
  "tier": 2,
  "summary": "Compare estimated calorie burn across running, cycling, swimming, walking, and resistance training.",
  "description": "This calculator compares estimated calorie expenditure across six common activities—walking, running, cycling, swimming, weight training, and rowing—using published MET (Metabolic Equivalent of Task) values from the Compendium of Physical Activities. It applies body weight and exercise duration to the standard MET formula (Calories = MET × kg × 3.5 / 200 × minutes) and displays side-by-side calorie burn estimates for each activity. Results represent population-average energy expenditure and do not account for individual fitness level, terrain, or exercise technique.",
  "page_url": "https://fitmetriclab.com/en/tools/energy-expenditure/activity-comparison/",
  "api_url": "https://fitmetriclab.com/api/tools/activity-comparison.json",
  "formula": {
    "id": "activity_comparison",
    "expression": "\\text{Calories} = \\text{MET} \\times w \\times \\frac{t}{60}",
    "variables": [
      {
        "symbol": "w",
        "description": "Weight in kg"
      },
      {
        "symbol": "t",
        "description": "Duration in minutes"
      }
    ]
  },
  "inputs": [
    {
      "id": "weight_kg",
      "label": "Weight",
      "type": "number",
      "unit": "kg",
      "default": 75,
      "min": 20,
      "max": 300,
      "step": 0.1
    },
    {
      "id": "minutes",
      "label": "Duration",
      "type": "number",
      "unit": "min",
      "default": 60,
      "min": 1,
      "max": 300,
      "step": 1
    }
  ],
  "worked_example": {
    "inputs": {
      "weight_kg": 75,
      "minutes": 60
    },
    "expected_output": "750 kcal"
  },
  "result_summary_template": "For a body weight of {weight_kg} kg exercising for {minutes} minutes, the calculator estimates energy expenditure across multiple activities using standard MET values, yielding {result}.",
  "methodology": "Applies published MET (Metabolic Equivalent of Task) values from the Compendium of Physical Activities to body weight and duration using the formula: Calories = (MET × kg × 3.5 / 200) × minutes. MET values represent activity intensity as multiples of resting metabolic rate.",
  "sources": [
    {
      "label": "Ainsworth BE, et al. 2011 Compendium of Physical Activities. Medicine & Science in Sports & Exercise. 2011.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/21681120/"
    },
    {
      "label": "Jetté M, Sidney K, Blümchen G. Metabolic equivalents (METS) in exercise testing, exercise prescription, and evaluation of functional capacity. Clinical Cardiology. 1990.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/2193704/"
    },
    {
      "label": "Byrne NM, Hills AP, Hunter GR, Weinsier RL, Schutz Y. Metabolic equivalent: one size does not fit all. Journal of Applied Physiology. 2005.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/16160020/"
    }
  ],
  "faqs": [
    {
      "question": "What are MET values and where do they come from?",
      "answer": "MET (Metabolic Equivalent of Task) values quantify the energy cost of physical activities as multiples of resting metabolic rate. One MET equals 3.5 mL of oxygen per kilogram of body weight per minute. The Compendium of Physical Activities, maintained by researchers at Arizona State University and published in Medicine & Science in Sports & Exercise, provides standardized MET values derived from laboratory measurements and field studies."
    },
    {
      "question": "Why do two activities with the same MET value show identical calorie estimates?",
      "answer": "MET values represent intensity relative to resting metabolism. When two activities share the same MET rating, they require the same relative metabolic demand per unit of body weight per unit of time, resulting in identical calorie estimates for a given weight and duration. Differences in perceived effort often reflect neuromuscular coordination, skill requirements, or local muscle fatigue rather than total energy expenditure."
    },
    {
      "question": "How does body weight affect the accuracy of these estimates?",
      "answer": "The MET formula assumes energy cost scales linearly with body mass, which is most accurate for weight-bearing activities and individuals with typical body composition. For very muscular individuals or those with higher adiposity, actual energy expenditure may differ because muscle tissue has higher metabolic activity than adipose tissue. Non-weight-bearing activities like cycling show less sensitivity to these composition differences."
    },
    {
      "question": "Do these estimates account for fitness level or training status?",
      "answer": "Standard MET values reflect population averages and do not adjust for individual fitness or movement economy. Trained individuals often expend fewer calories performing the same activity at the same absolute intensity due to improved biomechanical efficiency and technique. However, trained individuals typically exercise at higher absolute intensities, potentially offsetting this efficiency gain during actual training sessions."
    },
    {
      "question": "Can this tool be used to plan calorie deficits for weight management?",
      "answer": "The calculator provides estimates of exercise energy expenditure only. Weight management involves total daily energy expenditure (including basal metabolic rate, thermic effect of food, and non-exercise activity), energy intake, and individual metabolic adaptations. Exercise calorie estimates represent one component of energy balance and should be considered alongside other factors when evaluating overall energy needs."
    }
  ],
  "related_tools": [
    {
      "slug": "custom-met-calculator",
      "title": "Custom Activity MET Calculator",
      "api_url": "https://fitmetriclab.com/api/tools/custom-met-calculator.json",
      "page_url": "https://fitmetriclab.com/en/tools/energy-expenditure/custom-met-calculator/"
    },
    {
      "slug": "calories-cycling",
      "title": "Calorie Burn — Cycling",
      "api_url": "https://fitmetriclab.com/api/tools/calories-cycling.json",
      "page_url": "https://fitmetriclab.com/en/tools/energy-expenditure/calories-cycling/"
    },
    {
      "slug": "calories-rowing",
      "title": "Calorie Burn — Rowing",
      "api_url": "https://fitmetriclab.com/api/tools/calories-rowing.json",
      "page_url": "https://fitmetriclab.com/en/tools/energy-expenditure/calories-rowing/"
    }
  ],
  "last_updated": "2026-04-22",
  "price": {
    "value": 0,
    "currency": "USD"
  },
  "runs_in_browser": true,
  "disclaimer": "Educational estimate produced from a published formula. Not medical, nutritional, or training advice. Calculations are deterministic — apply the formula to the inputs to reproduce the result."
}