{
  "slug": "ideal-weight",
  "title": "Ideal Weight Calculator",
  "heading": "Ideal Weight Calculator",
  "category": "fitness-health",
  "url": "https://www.revenuelab.fyi/toolbox/ideal-weight",
  "summary": "Estimate ideal body weight from height and sex.",
  "description": "Uses the Devine and Robinson formulas, two widely cited equations for ideal body weight based on height and sex.",
  "formula": null,
  "dateModified": "2026-10-03",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=ideal-weight",
  "inputs": [
    {
      "id": "units",
      "label": "Units",
      "kind": "select",
      "hint": null,
      "default": "imperial",
      "options": [
        {
          "value": "metric",
          "label": "Metric (kg, cm)"
        },
        {
          "value": "imperial",
          "label": "Imperial (lb, in)"
        }
      ]
    },
    {
      "id": "height",
      "label": "Height (in or cm)",
      "kind": "number",
      "hint": null,
      "default": 68,
      "unit": null,
      "min": 0,
      "max": null
    },
    {
      "id": "sex",
      "label": "Sex",
      "kind": "select",
      "hint": null,
      "default": "male",
      "options": [
        {
          "value": "male",
          "label": "Male"
        },
        {
          "value": "female",
          "label": "Female"
        }
      ]
    }
  ],
  "outputs": [
    {
      "id": "devine",
      "label": "Devine (kg)",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "devineLb",
      "label": "Devine (lb)",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "robinson",
      "label": "Robinson (kg)",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "robinsonLb",
      "label": "Robinson (lb)",
      "format": "decimal",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Units: Imperial (lb, in)",
      "Height (in or cm): 68",
      "Sex: Male"
    ],
    "outputs": [
      "Devine (kg): 68.4",
      "Devine (lb): 150.8",
      "Robinson (kg): 67.2",
      "Robinson (lb): 148.2"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter units.",
      "Enter height (in or cm).",
      "Enter sex.",
      "Read your devine (kg) on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "units": "imperial",
        "height": 68,
        "sex": "male"
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "units": "imperial",
        "height": 68,
        "sex": "male"
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "units": "imperial",
        "height": 68,
        "sex": "male"
      }
    }
  ],
  "limitations": [
    "Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.",
    "Results do not account for medical conditions, medication, or pregnancy.",
    "Use this as a directional reference, not a diagnosis — talk to a clinician before acting on it."
  ],
  "faq": [
    {
      "q": "How does the ideal weight calculator work?",
      "a": "Uses the Devine and Robinson formulas, two widely cited equations for ideal body weight based on height and sex."
    },
    {
      "q": "What do I need to enter?",
      "a": "3 values: units, height (in or cm), and sex. Each field starts with a sensible default, so you can change one number at a time and watch the result move."
    },
    {
      "q": "What does the devine (kg) result mean?",
      "a": "It is returned as a decimal number and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds."
    },
    {
      "q": "Is this calculator free, and do I need an account?",
      "a": "Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser."
    },
    {
      "q": "How accurate is the result?",
      "a": "It applies the standard formula exactly, so the arithmetic is precise. Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone tracking a health or training target and wanting the standard formula applied correctly, without a signup or an app."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/bmi",
    "https://www.revenuelab.fyi/toolbox/body-fat"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Ideal Weight Calculator (https://www.revenuelab.fyi/toolbox/ideal-weight)"
}