{
  "slug": "calories-running",
  "title": "Calorie Burn — Running",
  "category": "Energy Expenditure",
  "category_slug": "energy-expenditure",
  "tier": 1,
  "summary": "Estimate calories burned during a run based on body weight, pace, and session duration.",
  "description": "This calculator estimates calories burned during running using metabolic equivalent (MET) values from the Compendium of Physical Activities. It requires body weight, running pace, and session duration as inputs, then applies pace-specific MET coefficients (ranging from 7.0 for easy jogs to 15.5 for sub-4:00 min/km efforts) to compute total energy expenditure in kilocalories. The estimate is most reliable for steady-state outdoor running on flat terrain and represents a population-average approximation rather than individualised measurement.",
  "page_url": "https://fitmetriclab.com/en/tools/energy-expenditure/calories-running/",
  "api_url": "https://fitmetriclab.com/api/tools/calories-running.json",
  "formula": {
    "id": "calories_running",
    "expression": "\\text{Calories} = \\text{MET}(p) \\times w \\times \\frac{t}{60}",
    "variables": [
      {
        "symbol": "w",
        "description": "Weight in kg"
      },
      {
        "symbol": "t",
        "description": "Duration in minutes"
      },
      {
        "symbol": "p",
        "description": "Pace in min/km"
      }
    ]
  },
  "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
    },
    {
      "id": "pace_min_per_km",
      "label": "Pace",
      "type": "number",
      "unit": "min/km",
      "default": 6,
      "min": 2,
      "max": 15,
      "step": 0.1
    }
  ],
  "worked_example": {
    "inputs": {
      "weight_kg": 75,
      "minutes": 60,
      "pace_min_per_km": 6
    },
    "expected_output": "735 kcal"
  },
  "result_summary_template": "A runner weighing {weight_kg} kg who maintains a pace of {pace_min_per_km} min/km for {minutes} minutes burns approximately {result}.",
  "methodology": "Calories = MET × body mass (kg) × duration (hours). MET assignments by pace: ≤4:00 min/km = 15.5; ≤5:00 = 11.8; ≤6:00 = 9.8; ≤7:00 = 8.3; >7:00 = 7.0. Values derived from the Compendium of Physical Activities (Ainsworth et al., 2011 update).",
  "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": "Compendium of Physical Activities. Arizona State University. Accessed 2025.",
      "url": "https://sites.google.com/site/compendiumofphysicalactivities/"
    },
    {
      "label": "Jetté M, Sidney K, Blümchen G. Metabolic equivalents (METS) in exercise testing, exercise prescription, and evaluation of functional capacity. Clin Cardiol. 1990;13(8):555–565.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/2204507/"
    }
  ],
  "faqs": [
    {
      "question": "Why does a faster pace increase calorie burn even for the same distance?",
      "answer": "Higher running speeds demand greater mechanical power to overcome air resistance and to cycle the legs more rapidly. Metabolic rate climbs because muscle fibers generate force at higher frequencies, and fast-twitch recruitment rises. The MET system captures this nonlinear relationship by assigning progressively higher MET values to faster paces."
    },
    {
      "question": "Does running uphill change the estimate?",
      "answer": "Yes, but this calculator does not account for gradient. Uphill running increases vertical work and can raise energy cost by 30–50% on steep grades. The MET values here assume flat terrain, so trail or hill repeats will underestimate actual expenditure."
    },
    {
      "question": "How accurate is the MET method compared to lab measurements?",
      "answer": "Population-level MET values typically fall within ±10–15% of indirect calorimetry measurements for steady-state running. Individual running economy, body composition, and biomechanics introduce variance, so the estimate serves as a reasonable average rather than a precise personal measurement."
    },
    {
      "question": "Can I use this calculator for treadmill running?",
      "answer": "Treadmill running at 0% grade generally requires slightly less energy than outdoor running because the belt assists leg turnover and eliminates air resistance. The difference is small—around 1–3%—so the calculator remains a useful approximation, though it may slightly overestimate treadmill expenditure."
    },
    {
      "question": "Why does the calculator ask for pace in min/km instead of speed in km/h?",
      "answer": "Runners commonly communicate pace in minutes per kilometer (or mile), and published MET tables often bin activities by pace bands. The tool mirrors this convention to match real-world training logs and race pacing strategies."
    }
  ],
  "related_tools": [
    {
      "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-walking",
      "title": "Calorie Burn — Walking",
      "api_url": "https://fitmetriclab.com/api/tools/calories-walking.json",
      "page_url": "https://fitmetriclab.com/en/tools/energy-expenditure/calories-walking/"
    },
    {
      "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."
}