{
  "slug": "calories-weight-training",
  "title": "Calorie Burn — Weight Training",
  "category": "Energy Expenditure",
  "category_slug": "energy-expenditure",
  "tier": 2,
  "summary": "Estimate calories burned during weight training sessions using MET-based energy expenditure equations.",
  "description": "This calculator estimates calories burned during weight training sessions using MET-based energy expenditure equations derived from the Compendium of Physical Activities. It accepts body weight, session duration, and intensity level (light, moderate, or vigorous) as inputs and returns an estimated calorie burn in kilocalories. MET values of 3.5, 5.0, and 6.0 correspond to light, moderate, and vigorous resistance training intensities, respectively, representing population-average energy costs rather than individualized measurements.",
  "page_url": "https://fitmetriclab.com/en/tools/energy-expenditure/calories-weight-training/",
  "api_url": "https://fitmetriclab.com/api/tools/calories-weight-training.json",
  "formula": {
    "id": "calories_weight_training",
    "expression": "\\text{Calories} = \\text{MET}(i) \\times w \\times \\frac{t}{60}, \\quad \\text{MET} \\in [3.5, 6.0]",
    "variables": [
      {
        "symbol": "w",
        "description": "Body weight in kg"
      },
      {
        "symbol": "t",
        "description": "Duration in minutes"
      },
      {
        "symbol": "i",
        "description": "Intensity level"
      }
    ]
  },
  "inputs": [
    {
      "id": "weight_kg",
      "label": "Body Weight",
      "type": "number",
      "unit": "kg",
      "default": 75,
      "min": 20,
      "max": 300,
      "step": 0.5
    },
    {
      "id": "minutes",
      "label": "Duration",
      "type": "number",
      "unit": "min",
      "default": 60,
      "min": 5,
      "max": 300,
      "step": 5
    },
    {
      "id": "intensity",
      "label": "Intensity",
      "type": "select",
      "unit": null,
      "default": 1,
      "options": [
        {
          "value": 0,
          "label": "Light (MET 3.5)"
        },
        {
          "value": 1,
          "label": "Moderate (MET 5.0)"
        },
        {
          "value": 2,
          "label": "Vigorous (MET 6.0)"
        }
      ]
    }
  ],
  "worked_example": {
    "inputs": {
      "weight_kg": 75,
      "minutes": 60,
      "intensity": 1
    },
    "expected_output": "375 kcal"
  },
  "result_summary_template": "For a body weight of {weight_kg} and {minutes} of weight training at the selected intensity, the MET-based equation estimates {result}.",
  "methodology": "Applies the MET formula: Calories = MET × body weight (kg) × duration (hours). MET values of 3.5, 5.0, and 6.0 represent light, moderate, and vigorous resistance training intensity, respectively, consistent with the Compendium of Physical Activities (Ainsworth et al., 2011).",
  "sources": [
    {
      "label": "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.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/21681120/"
    },
    {
      "label": "Haddock BL, Wilkin LD. Resistance training volume and post exercise energy expenditure. Int J Sports Med. 2006;27(2):143-148.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/16475060/"
    },
    {
      "label": "Scott CB. Contribution of blood lactate to the energy expenditure of weight training. J Strength Cond Res. 2006;20(2):404-411.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/16686572/"
    }
  ],
  "faqs": [
    {
      "question": "Why do the intensity levels use MET values of 3.5, 5.0, and 6.0?",
      "answer": "These MET assignments come from the Compendium of Physical Activities, which catalogs metabolic costs for hundreds of exercises. Light (3.5 MET) typically describes general resistance training with longer rest periods or lighter loads. Moderate (5.0 MET) reflects bodybuilding or circuit-style training with standard rest intervals. Vigorous (6.0 MET) represents high-intensity lifting with heavy compound movements and shorter rests. The Compendium bases these values on measured oxygen consumption in lab and field studies."
    },
    {
      "question": "Does this estimate include afterburn or EPOC?",
      "answer": "No. The calculator measures only the energy expended during the training session itself. Excess post-exercise oxygen consumption (EPOC) can elevate metabolic rate for hours after intense resistance training, adding 6–15% or more to total session cost. This effect is highly variable and depends on training volume, load, and individual recovery capacity, making it difficult to model in a simple calculator."
    },
    {
      "question": "How does rest time between sets affect the estimate?",
      "answer": "The MET values assume typical gym behavior with average rest intervals. Shorter rest periods (30–60 seconds) maintain elevated heart rate and metabolic demand, potentially increasing energy cost. Longer rest periods (3–5 minutes) allow more complete recovery and reduce average session intensity. The calculator cannot adjust for individual rest protocols; users training with very short or very long rest periods may see actual expenditure differ from the estimate."
    },
    {
      "question": "Why might two people of the same weight see different actual calorie burns?",
      "answer": "Muscle mass, training efficiency, and movement economy all influence energy cost. An individual with greater lean body mass typically has higher metabolic demand for the same absolute workload. Trained lifters often move more efficiently, reducing per-rep energy cost but enabling higher total volume. Fiber-type distribution, mitochondrial density, and neuromuscular coordination introduce further variation. MET-based estimates reflect population averages and may not capture individual physiology."
    },
    {
      "question": "Can this calculator be used for bodyweight resistance exercises?",
      "answer": "The tool is calibrated for general weight training, which can include bodyweight exercises like push-ups, pull-ups, or squats. The same MET framework applies, though the actual intensity depends on the specific movements performed and the individual's strength-to-weight ratio. Very high-rep calisthenics circuits may fit the moderate or vigorous category, while low-intensity bodyweight warm-ups may align with the light setting."
    }
  ],
  "related_tools": [
    {
      "slug": "calories-swimming",
      "title": "Calorie Burn — Swimming",
      "api_url": "https://fitmetriclab.com/api/tools/calories-swimming.json",
      "page_url": "https://fitmetriclab.com/en/tools/energy-expenditure/calories-swimming/"
    },
    {
      "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."
}