Email Revenue Calculator | Revenue Per Subscriber, List Value & Campaign ROI
Calculate your email list revenue value, revenue per subscriber (RPS), and 12-month campaign ROI. Model list decay based on monthly unsubscribe rates, deliverability tier impact on open rates, and optimal send frequency for maximum revenue.
List & Campaign Settings
Avg revenue per unique click
Click rate among openers
What Is the Email Revenue Calculator | Revenue Per Subscriber, List Value & Campaign ROI?
Email marketing consistently delivers the highest ROI of any digital channel — industry studies put average email ROI at $36–$45 per dollar spent. This calculator helps you quantify what your current list is worth, project revenue as your list naturally decays, and identify the deliverability tier penalties that may be silently costing you revenue.
- ▸Revenue per Subscriber (RPS): The single most important list health metric. Divide monthly email revenue by subscriber count. Industry benchmarks range from $0.50 to $5.00+ per subscriber per month depending on niche and email frequency.
- ▸Total list value: The 12-month cumulative revenue projection, accounting for list decay. This is the number you should reference when evaluating list growth costs and ESP pricing.
- ▸Deliverability tiers: Poor deliverability (open rates below 10%) triggers spam filters and Gmail Promotions tab filtering, reducing effective inbox delivery. This calculator applies revenue penalties of 5–30% based on your tier.
- ▸List half-life: How quickly your list is declining. A half-life of 24 months means in two years, half your current subscribers will have unsubscribed — even without adding anyone new.
Formula
Email revenue flows from list size through open rate, click rate, and revenue per click, while the list itself decays each month from unsubscribes.
Click Rate = Open Rate × CTR from Open
The overall click-to-send rate. If 25% open and 15% of openers click, implied CTR = 3.75%.
Rev/Send = Subscribers × Click Rate × Rev/Click
Revenue generated from a single email campaign before deliverability adjustments.
Monthly Rev = Rev/Send × Sends per Month
Multiply by sends frequency. 4 sends/month at $500/send = $2,000/month.
Subs(t) = Subs₀ × (1 − unsub_rate)^t
Subscribers compound-decay each month. At 0.5%/month, you lose ~5.8% after 12 months. At 2%, you lose 21%.
How to Use
- 1
Enter your total active subscriber count from your ESP dashboard.
- 2
Set revenue per email click — average revenue per unique click from ESP or ecommerce attribution.
- 3
Enter sends per month and your average open rate from last 3-month performance data.
- 4
Enter CTR from open (click rate among openers, not total subscribers).
- 5
Set monthly unsubscribe rate (typically 0.2%–2%).
- 6
Select the deliverability tier that matches your typical open rate range.
- 7
Optionally enter your monthly ESP cost to see break-even sends calculation.
- 8
Click Calculate and read the 12-month projection chart and revenue dashboard cards.
- 1
Enter your current subscriber count — use your active (non-unsubscribed) list size from your ESP dashboard.
- 2
Enter revenue per email click — this is your average revenue attributed to each email click, found in your ESP revenue tracking or ecommerce attribution.
- 3
Set sends per month (typical range: 2–8 for e-commerce, 1–4 for B2B).
- 4
Enter your average open rate and CTR from open (click rate among openers) from your last 3-month average.
- 5
Set your monthly unsubscribe rate — typically 0.2%–2% depending on list quality and send frequency.
- 6
Select your deliverability tier based on your typical open rate to apply the appropriate revenue penalty.
- 7
Optionally enter your monthly ESP cost to calculate break-even sends per month.
- 8
Click Calculate and review the 12-month projection chart to see how list decay affects revenue over time.
Example Calculation
E-commerce fashion brand
Excellent deliverability tier with 28% open rates. At $0.71 RPS/month, this list is worth ~$151K over the next year.
B2B SaaS newsletter
B2B audiences have lower unsubscribe rates and higher revenue per click due to higher-value conversions. Even a small engaged B2B list can outperform a large consumer list.
Understanding Email Revenue | Revenue Per Subscriber, List Value & Campaign ROI
Email Marketing Benchmarks by Industry
| Industry | Avg Open Rate | Avg CTR | Revenue Per Click | RPS / Month |
|---|---|---|---|---|
| E-commerce (fashion) | 18–25% | 8–14% | $2–$5 | $0.50–$1.50 |
| E-commerce (beauty/health) | 20–30% | 10–18% | $3–$8 | $0.80–$2.50 |
| SaaS (SMB) | 25–40% | 5–12% | $15–$50 | $1–$5 |
| Media / Newsletter | 30–50% | 8–20% | $0.50–$3 | $0.20–$1.20 |
| B2B Services | 25–35% | 6–14% | $20–$100 | $2–$8 |
| Nonprofit | 25–35% | 3–8% | N/A (donations) | Varies |
The True Cost of List Decay
A 1% monthly unsubscribe rate compounds to a 11.4% annual loss. A 2% monthly rate compounds to a 21.5% annual loss. Many brands treat email list growth as optional when they have a large list, but list decay means you're constantly running to stand still.
| Monthly Unsub Rate | List After 12 Mo | Revenue Loss vs Month 1 | Half-Life |
|---|---|---|---|
| 0.25% | 97% | −3% | 23 years |
| 0.5% | 94.2% | −5.8% | 11.5 years |
| 1% | 88.6% | −11.4% | 5.8 years |
| 2% | 78.5% | −21.5% | 2.9 years |
| 3% | 69.6% | −30.4% | 1.9 years |
| 5% | 54.1% | −45.9% | 1.1 years |
Improving Your Email List Value
- ▸Segment by purchase history: Buyers convert 3–5x better than non-buyers. Segmenting and targeting your buyer list separately improves RPS significantly.
- ▸Win-back campaigns: Subscribers who haven't opened in 90+ days drag down your open rate and damage sender reputation. A win-back sequence with a compelling offer can re-engage 5–15% of cold subscribers.
- ▸Optimize send frequency: Many brands over-send, increasing unsubscribe rates without proportional revenue gains. Test removing 1 send/month and measuring net revenue impact.
- ▸Improve subject lines with testing: A 5% improvement in open rate directly increases monthly revenue by 5%. Subject line A/B testing is the highest-leverage email optimization.
- ▸Post-purchase flows: Automated post-purchase sequences (cross-sell, upsell, review requests) generate 20–40% of email revenue without increasing list decay through over-sending.
Frequently Asked Questions
What is Revenue Per Subscriber (RPS) and what is a good benchmark?
RPS is monthly email revenue divided by total subscribers. Benchmarks vary widely by niche: e-commerce brands typically see $0.50–$2.00 per subscriber per month with 4–6 sends. B2B SaaS newsletters often see $1–$5 per subscriber. High-intent lists (e.g. active buyers vs. cold leads) can reach $5–$15. If your RPS is below $0.30, focus on list segmentation, re-engagement campaigns, and improving offer alignment.
How do I find my revenue per email click?
In most ESPs (Klaviyo, Mailchimp, Drip), go to campaign reports and look for "Revenue per click" or connect your Shopify/WooCommerce store for automatic revenue attribution. If you use UTM tracking, you can find this in Google Analytics under Traffic Source → Email → Ecommerce. For lead-gen, estimate based on your average lead value and email-attributed close rate.
What monthly unsubscribe rate is normal?
Industry averages are 0.1%–0.5% per send. Monthly rates depend on send frequency. With 4 sends/month at 0.2% unsub rate per send, your monthly unsubscribe rate is ~0.8%. Rates above 0.5%/month (monthly total) typically indicate list quality issues, over-sending, or poor offer-list alignment. Rates below 0.2%/month suggest a highly engaged, well-segmented audience.
How does deliverability tier affect revenue?
Poor deliverability (open rates below 10%) means a significant portion of emails land in spam or are blocked entirely. This calculator applies revenue penalties: 5% for Good tier, 15% for Average, and 30% for Poor. These are conservative estimates — in severe cases, effective reach can drop by 50%+. Improving sender reputation through list cleaning, consistent sending schedule, and engagement segmentation can recover this revenue.
Should I grow my list or improve engagement to increase revenue?
Both, but the math favors engagement improvement first. Doubling your list from 10,000 to 20,000 doubles revenue if all else is equal. But improving CTR from open from 8% to 16% also doubles revenue — and usually costs far less than acquiring 10,000 new subscribers. The most ROI-efficient path: improve RPS first (better segments, better offers, better subject lines), then invest in list growth to multiply that improved RPS across a larger base.
You Might Also Like
Explore 360+ Free Calculators
From math and science to finance and everyday life — all free, no account needed.