{
  "slug": "jet-lag-recovery",
  "title": "Jet Lag Recovery Calculator",
  "heading": "Jet Lag Recovery Time Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/jet-lag-recovery",
  "summary": "Days to adjust and when to shift your sleep.",
  "description": "The body clock resets about one time zone per day, faster going west than east. This estimates recovery and a pre-flight shifting plan.",
  "formula": "Days ≈ zones ÷ 1.5 (west) or zones ÷ 1 (east)",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=jet-lag-recovery",
  "inputs": [
    {
      "id": "zones",
      "label": "Time zones crossed",
      "kind": "number",
      "hint": null,
      "default": 8,
      "unit": null,
      "min": 0,
      "max": 14
    },
    {
      "id": "dir",
      "label": "Direction",
      "kind": "select",
      "hint": null,
      "default": "east",
      "options": [
        {
          "value": "east",
          "label": "Eastward (harder)"
        },
        {
          "value": "west",
          "label": "Westward (easier)"
        }
      ]
    },
    {
      "id": "prep",
      "label": "Days you can prep before flying",
      "kind": "number",
      "hint": null,
      "default": 3,
      "unit": null,
      "min": 0,
      "max": 10
    }
  ],
  "outputs": [
    {
      "id": "days",
      "label": "Days to fully adjust",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "adjusted",
      "label": "Days with pre-trip shifting",
      "format": "decimal",
      "hint": null,
      "primary": false
    },
    {
      "id": "shiftPerDay",
      "label": "Pre-flight plan",
      "format": "raw",
      "hint": null,
      "primary": false
    },
    {
      "id": "light",
      "label": "Light exposure",
      "format": "raw",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Time zones crossed: 8",
      "Direction: Eastward (harder)",
      "Days you can prep before flying: 3"
    ],
    "outputs": [
      "Days to fully adjust: 8",
      "Days with pre-trip shifting: 6.5",
      "Pre-flight plan: Go to bed 30–60 min earlier each night",
      "Light exposure: Seek morning light on arrival"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter time zones crossed.",
      "Enter direction.",
      "Enter days you can prep before flying.",
      "Read your days to fully adjust 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": {
        "zones": 5,
        "dir": "east",
        "prep": 2
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "zones": 8,
        "dir": "east",
        "prep": 3
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "zones": 13,
        "dir": "east",
        "prep": 5
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "How does the jet lag recovery time calculator work?",
      "a": "The body clock resets about one time zone per day, faster going west than east. This estimates recovery and a pre-flight shifting plan. The underlying maths is: Days ≈ zones ÷ 1.5 (west) or zones ÷ 1 (east)"
    },
    {
      "q": "What do I need to enter?",
      "a": "3 values: time zones crossed, direction, and days you can prep before flying. 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 days to fully adjust 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. Estimates assume standard, average conditions — local rules, pricing, and materials vary."
    },
    {
      "q": "Who is this tool for?",
      "a": "It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app."
    }
  ],
  "related": [],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Jet Lag Recovery Calculator (https://www.revenuelab.fyi/toolbox/jet-lag-recovery)"
}