Definition
Forward to a friend rate measures the percentage of delivered emails that recipients forward to someone else, typically through a forward link or button in the email or by using their email client's forward function. It is a high-value signal because forwarding requires the recipient to believe the content is worth passing to a specific person they know.
Forwarding is a form of personal recommendation. Unlike a broad social share, a forward is usually directed at one person for a specific reason, which makes it a strong indicator of genuine value and a driver of organic list growth.
How It Works
Forward rate is calculated by dividing the number of forwards by the number of delivered emails and multiplying by 100. Measurement is imperfect because native forwards made through the email client are often invisible to the sender; forward buttons embedded in the email are the primary trackable source.
- Tracked forwards come from a dedicated forward link or button in the email.
- Native forwards happen in the recipient's client and may go untracked.
- Forward-to-a-friend pages capture the action and can also collect the new recipient as a subscriber.
Because tracked forwards undercount the true total, the rate is best used as a directional indicator and a relative comparison across campaigns, rather than an exact count of every share.
Why It Matters
Forward rate is one of the clearest signals that content is genuinely useful. A recipient who forwards an email is putting their own reputation behind it, which is a stronger endorsement than a click. Campaigns that earn high forward rates also tend to perform well on the metrics that matter downstream, including conversion rate and long-term retention.
For list growth, forwards are a low-cost acquisition channel that lowers the effective cost per acquisition. Every forward introduces the brand to a new person who already has a recommendation from someone they trust, which typically converts to a subscriber more readily than a cold advertisement.
Best Practices
- Add a clearly visible forward-to-a-friend link or button for content you expect people to share.
- Make the forwarded version look as good as the original by testing the forwarding experience.
- Offer content formats that are naturally forwardable, such as resources, guides, and useful checklists.
- Track forward rate alongside your overall share activity to understand the full picture of earned distribution.
Example
A financial newsletter sends a guide to tax deductions to 10,000 subscribers. The email records 60 tracked forwards, giving a forward rate of 0.6 percent — high for this sender. The team notes the topic's shareability and expands into a monthly forwardable guide series.
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Frequently Asked Questions
Many forwards happen through the recipient's email client and are invisible to the sender's tracking. Forward buttons embedded in the email capture only a portion of the total, so the rate is best used as a relative signal.
It indicates that recipients find the content valuable enough to recommend to a specific person, which is a stronger endorsement than a click and a leading indicator of organic growth.
Use a visible forward link, create content worth passing along, and remind recipients that the message can help a colleague or friend. Timing matters too, since relevant, timely content is shared most.
No. Forward rate measures how often content is forwarded, while the viral coefficient measures the full loop — how many of those forwards convert into new subscribers. The two are related but distinct.