{
    "name": "Email Unsubscribe Rate Calculator",
    "url": "https://calculators.geekmidst.com/calculators/email-unsubscribe-rate-calculator",
    "markdown": "https://calculators.geekmidst.com/calculators/email-unsubscribe-rate-calculator.md",
    "category": "Marketing analytics",
    "description": "Calculate the unsubscribe rate of an email send as unsubscribes divided by emails delivered, and unsubscribes per 1,000 delivered.",
    "summary": "Unsubscribe rate is the share of delivered emails that led the recipient to opt out: unsubscribes divided by emails delivered, times 100.",
    "also_called": [
        "Opt-out rate calculator"
    ],
    "applies_to": "Worldwide",
    "last_updated": "2026-10-29",
    "computation": "Results are computed in the visitor’s browser on the HTML page. This API describes the calculator; it does not compute results.",
    "inputs": [
        {
            "name": "delivered",
            "label": "Emails delivered",
            "type": "number",
            "default": "12500"
        },
        {
            "name": "unsubscribes",
            "label": "Unsubscribes",
            "type": "number",
            "default": "25"
        }
    ],
    "outputs": [
        {
            "key": "unsubscribe_rate",
            "label": "Unsubscribe rate",
            "format": "percent"
        },
        {
            "key": "per_thousand",
            "label": "Unsubscribes per 1,000 delivered",
            "format": "number"
        }
    ],
    "formula": {
        "text": "Unsubscribe rate = Unsubscribes ÷ Delivered × 100;  Per 1,000 = Unsubscribes ÷ Delivered × 1,000",
        "variables": {
            "Delivered": "emails that reached the receiving server (the denominator)",
            "Unsubscribes": "opt-outs attributed to this send"
        }
    },
    "worked_example": {
        "inputs": {
            "delivered": "12500",
            "unsubscribes": "25"
        },
        "steps": [
            "Unsubscribe rate = 25 ÷ 12,500 × 100 = 0.2%.",
            "Per 1,000 = 25 ÷ 12,500 × 1,000 = 2."
        ],
        "result": "25 unsubscribes from 12,500 delivered emails is a 0.2% unsubscribe rate, 2 per thousand."
    },
    "interpretation": "Watch the trend per campaign type rather than a single number. A spike after a particular send often means the frequency, the content or the audience was off.",
    "assumptions": [
        "Unsubscribes are counted against the send that prompted them."
    ],
    "limitations": [
        "Spam complaints are a separate, more damaging signal and are not included here."
    ],
    "rules": null,
    "faqs": [
        {
            "question": "Why divide by delivered rather than sent?",
            "answer": "Bounced emails were never received, so their recipients could not unsubscribe. Dividing by sent would understate the rate."
        }
    ],
    "sources": [],
    "related": [
        {
            "name": "Email Subscriber Growth Calculator",
            "url": "https://calculators.geekmidst.com/calculators/email-subscriber-growth-calculator"
        },
        {
            "name": "Email Bounce Rate Calculator",
            "url": "https://calculators.geekmidst.com/calculators/email-bounce-rate-calculator"
        },
        {
            "name": "Email Click-to-Open Rate Calculator",
            "url": "https://calculators.geekmidst.com/calculators/email-click-to-open-rate-calculator"
        },
        {
            "name": "Percentage Calculator",
            "url": "https://calculators.geekmidst.com/calculators/percentage-calculator"
        }
    ],
    "disclaimer": null,
    "publisher": "GM¹X CalcVerse"
}