function calculateDeliveryRate() {
// Get input values
var sentInput = document.getElementById('totalSent');
var bouncedInput = document.getElementById('totalBounced');
var costInput = document.getElementById('campaignCost');
var resultsDiv = document.getElementById('drcResults');
var errorDiv = document.getElementById('drcErrorMessage');
var costRow = document.getElementById('costRow');
var sent = parseFloat(sentInput.value);
var bounced = parseFloat(bouncedInput.value);
var cost = parseFloat(costInput.value);
// Reset display
errorDiv.style.display = 'none';
errorDiv.innerText = ";
resultsDiv.style.display = 'none';
// Validation
if (isNaN(sent) || sent <= 0) {
errorDiv.innerText = "Please enter a valid number of Total Emails Sent.";
errorDiv.style.display = 'block';
return;
}
if (isNaN(bounced) || bounced sent) {
errorDiv.innerText = "Bounced emails cannot exceed Total Sent emails.";
errorDiv.style.display = 'block';
return;
}
// Calculations
var delivered = sent – bounced;
var deliveryRate = (delivered / sent) * 100;
var bounceRate = (bounced / sent) * 100;
// Display Base Results
document.getElementById('resDelivered').innerText = delivered.toLocaleString();
document.getElementById('resRate').innerText = deliveryRate.toFixed(2) + "%";
document.getElementById('resBounceRate').innerText = bounceRate.toFixed(2) + "%";
// Cost Calculations (if provided)
if (!isNaN(cost) && cost > 0 && delivered > 0) {
var costPerDelivered = cost / delivered;
document.getElementById('resCostPer').innerText = "$" + costPerDelivered.toFixed(3);
costRow.style.display = 'flex';
} else {
costRow.style.display = 'none';
}
// Show Results
resultsDiv.style.display = 'block';
}
Understanding Delivery Rate in Email Marketing
The Delivery Rate is a critical metric in email marketing and digital communications. It measures the percentage of emails that successfully land in a subscriber's inbox or spam folder, as opposed to being rejected (bounced) by the receiving server. While high delivery rates do not guarantee engagement (opens and clicks), they are the foundational first step of any successful campaign.
The Delivery Rate Formula
Calculating your delivery rate is straightforward. It is determined by subtracting the number of bounced emails from the total number of emails sent, dividing that figure by the total sent, and multiplying by 100 to get a percentage.
Formula: Delivery Rate = ((Total Sent – Total Bounced) / Total Sent) × 100
For example, if you send 10,000 emails and 500 bounce, your calculation would be:
Successful Deliveries: 10,000 – 500 = 9,500
Calculation: (9,500 / 10,000) × 100
Delivery Rate: 95%
Why Delivery Rate Matters
Monitoring this metric helps marketers identify issues with their email list hygiene or sender reputation. A low delivery rate typically indicates one of two things:
Poor List Hygiene: Your list contains many invalid, old, or misspelled email addresses (Hard Bounces).
Technical Issues: The recipient's mailbox is full, or the server is temporarily down (Soft Bounces).
Delivery Rate vs. Deliverability
It is important to distinguish between Delivery Rate and Deliverability. Delivery Rate simply checks if the email was accepted by the receiving server. Deliverability goes a step further and measures whether that email landed in the Primary Inbox rather than the Spam or Junk folder.
What is a Good Delivery Rate?
Generally, a healthy email delivery rate is considered to be 95% or higher. If your rate falls below 95%, it is advisable to scrub your email list to remove inactive or invalid addresses. Consistent rates below 90% can severely damage your sender reputation, causing future emails to be blocked by major ISPs like Gmail and Outlook.
How to Improve Your Delivery Rate
Use Double Opt-In: Ensure users confirm their email address before being added to your list.
Clean Your List Regularly: Remove hard bounces immediately and scrub inactive users every 6 months.
Authenticate Your Domain: Implement SPF, DKIM, and DMARC protocols to verify your identity to ISPs.
Avoid Spam Triggers: Avoid excessive use of capital letters, spammy keywords, and broken links in your content.