Newsletter revenue metrics that predict anything

What to take away

The six numbers that predict revenue

Most newsletter dashboards show a dozen metrics and explain none of them. The six below earn a place because each one changes a decision you are about to make: what to charge, when to send, whether to keep a sponsor, or whether the list is worth growing.

Paid conversion rate is paid subscribers divided by total subscribers over a period. It predicts whether your free list can fund the work. Both Substack and Ghost report it in their dashboards. A list that grows while conversion falls is a list of people who will never pay, and volume does not fix that.

Paid subscriber churn is cancellations in a month divided by paid subscribers at the start. It predicts next month's revenue before next month arrives. Stripe Billing reports the cancellations; your platform turns them into a rate. If churn runs above your conversion rate, you are refilling a leaking bucket.

Average revenue per subscriber (ARPS) is total revenue divided by total subscribers, paid and free. It predicts what one more subscriber is worth. That figure decides whether you buy ads or run a referral offer. SparkLoop and similar paid recommendation networks charge per subscriber, often a few dollars each in US newsletters. It also decides whether a sponsorship rate card holds, because sponsor pricing tracks revenue per subscriber per month.

Revenue per issue is the revenue attributed to a single send. It predicts which topics, formats and send days pay. Sort your last twenty issues by this figure and the pattern is usually obvious, and usually not what you assumed.

Sponsor renewal rate is sponsors who booked again divided by sponsors who could have. It predicts whether your rate card holds. One-off sponsors at a high rate are worse than repeat sponsors at a lower one. Marketplaces like Paved and the beehiiv Ad Network list placements and campaign budgets, but repeat buying confirms your rate.

Refunds and payment fees come out of gross. Stripe publishes 2.9% plus 30 cents for a standard US card charge, and PayPal lists 2.99% plus 49 cents on standard US commercial transactions. Read your own schedule instead of assuming a percentage. A refund rate above a few points usually means the offer or the checkout page oversold.

Platform cuts stack on top of processing. Substack takes 10% of subscription revenue plus Stripe fees. Ghost takes no cut of subscriptions and is free to self-host, with hosted plans starting around $9 a month billed annually. beehiiv advertises no revenue share on subscriptions and prices its plans by subscriber count.

The list numbers behind the revenue

Six more figures cover the list side. Pull them from the same dashboard on the same day each month.

A trend across six months beats any single reading. Open rate can spot a collapse, such as a drop from 42 percent to 28 percent over two months.

A worked example: two issues, same list

Say you send twice in a month to 4,000 subscribers, 300 of them paid at $8 a month.

Issue B still made money, because four people converted and that conversion repeats monthly. Issue A made more today. Which issue was better is the wrong question. The decision is whether you can sell a sponsorship into the format B used, because that format converts.

Run this table with your own numbers. The arithmetic is subtraction and division. The variables are yours: subscribers, price, sponsor rate, fee percentage and churn.

Scaling the same example to 5,000 subscribers. Take 5,000 subscribers, 400 of them paid at $8 a month, and one sponsor at $650. Stripe's published US card rate is 2.9 percent plus 30 cents a charge, so fees come to about $213 on 400 charges.

Subscription revenue is price times paid subscribers. Revenue per subscriber is net divided by the whole list, paid and free.

Compliance checks that touch the money

The CAN-SPAM Act compliance guide sets the federal baseline for commercial email: accurate headers and subject lines, a physical postal address, a working opt-out, and opt-outs honored within ten business days. It holds you responsible for vendors sending on your behalf, which matters when a sponsor's copy goes out under your name.

Paid trials and recurring subscriptions fall under the FTC's ROSCA guidance, which requires clear disclosure of material terms before you collect billing details, express informed consent before charging, and a simple way to cancel. State statutes can add requirements on top. Confirm your own setup with a licensed attorney rather than copying another publisher's checkout flow.

On the books side, the IRS recordkeeping guidance lets you choose a system that clearly shows income and expenses, as long as it supports your filings.

Newsletter revenue, sponsor invoices and processor fees all land on Schedule C. Contractor payments of $600 or more to one person in a year generally require a 1099-NEC. Ask a CPA or enrolled agent how your own entity should report it. A sole proprietor can file a Schedule C alone, and a CPA is not required for that.

The choice turns on entity type, state registration and whether you pay contractors.

Common questions

How often should I review these numbers?

Monthly for churn, conversion and revenue per issue; quarterly for sponsor renewal and refunds. Monthly reviews catch a conversion slide while it is still fixable. Quarterly reviews are enough for figures that move slowly.

Which single metric should a new newsletter watch first?

Revenue per issue, even at small numbers. It forces you to connect a send to money instead of to opens. Once you have twenty issues of data, the pattern tells you what to publish more of.

Do platform fees change the ranking of these metrics?

They change the totals, not the ranking. Subtract fees and refunds before you compare issues, or a high-fee month will look better than it was. Each platform publishes its own fee terms, so check yours rather than trusting a comparison table.