{
  "slug": "email-list-growth",
  "title": "Email List Growth Calculator",
  "heading": "Email List Growth Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/email-list-growth",
  "summary": "Net list size after churn, and time to your subscriber goal.",
  "description": "Every list leaks. Unsubscribes plus hard bounces plus quiet disengagement typically clear 0.3–0.8% a month, so gross signups always overstate the growth you keep.",
  "formula": "Net monthly = Signups − (List × churn rate); projected forward month by month.",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=email-list-growth",
  "inputs": [
    {
      "id": "list",
      "label": "Current list size",
      "kind": "number",
      "hint": null,
      "default": 12000,
      "unit": null,
      "min": 0,
      "max": null
    },
    {
      "id": "signups",
      "label": "New signups per month",
      "kind": "number",
      "hint": null,
      "default": 1400,
      "unit": null,
      "min": 0,
      "max": null
    },
    {
      "id": "churn",
      "label": "Monthly churn rate",
      "kind": "number",
      "hint": null,
      "default": 0.6,
      "unit": "%",
      "min": 0,
      "max": 20
    },
    {
      "id": "months",
      "label": "Months to project",
      "kind": "number",
      "hint": null,
      "default": 12,
      "unit": null,
      "min": 1,
      "max": 60
    },
    {
      "id": "target",
      "label": "Target list size",
      "kind": "number",
      "hint": null,
      "default": 50000,
      "unit": null,
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "projected",
      "label": "Projected list size",
      "format": "number",
      "hint": null,
      "primary": true
    },
    {
      "id": "net",
      "label": "Net subscribers added",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "monthlyNet",
      "label": "Net growth this month",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "monthsToTarget",
      "label": "Months to reach target",
      "format": "number",
      "hint": null,
      "primary": false
    },
    {
      "id": "ceiling",
      "label": "Steady-state list ceiling at this pace",
      "format": "number",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Current list size: 12000",
      "New signups per month: 1400",
      "Monthly churn rate: 0.6 %",
      "Months to project: 12",
      "Target list size: 50000"
    ],
    "outputs": [
      "Projected list size: 27,420.49",
      "Net subscribers added: 15,420.49",
      "Net growth this month: 1,328",
      "Months to reach target: 32",
      "Steady-state list ceiling at this pace: 233,333.33"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter current list size.",
      "Enter new signups per month.",
      "Enter monthly churn rate (%).",
      "Enter months to project.",
      "Enter target list size.",
      "Read your projected list size 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": {
        "list": 7200,
        "signups": 850,
        "churn": 0.36,
        "months": 7,
        "target": 30000
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "list": 12000,
        "signups": 1400,
        "churn": 0.6,
        "months": 12,
        "target": 50000
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "list": 19200,
        "signups": 2250,
        "churn": 0.96,
        "months": 19,
        "target": 80000
      }
    }
  ],
  "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 email list growth calculator work?",
      "a": "Every list leaks. Unsubscribes plus hard bounces plus quiet disengagement typically clear 0.3–0.8% a month, so gross signups always overstate the growth you keep. The underlying maths is: Net monthly = Signups − (List × churn rate); projected forward month by month."
    },
    {
      "q": "What do I need to enter?",
      "a": "5 values: current list size, new signups per month, monthly churn rate, months to project, and target list size. 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 projected list size result mean?",
      "a": "It is returned as a whole 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": [
    "https://www.revenuelab.fyi/toolbox/newsletter-revenue",
    "https://www.revenuelab.fyi/toolbox/follower-growth-rate"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Email List Growth Calculator (https://www.revenuelab.fyi/toolbox/email-list-growth)"
}