Subscription Box Profitability Calculator

Per-box margin and monthly net across the subscriber base

A $45 box with $16 in product COGS, $3.50 in pick/pack/insert costs, and $7.25 in outbound shipping leaves $18.25 before payment fees. After a 2.9% + $0.30 payment processing fee ($1.605), unit profit comes to $16.645 per box -- a 36.99% margin. Across 180 active subscribers, that's $2,996.10 in monthly net.

Shipping ($7.25) is the single largest cost line after COGS, and it's also the most volatile one in practice -- carrier rate changes and box weight both move this number more than any other input, which makes it worth re-checking every time rates update.

This is a per-unit contribution margin, not a full P&L: it doesn't yet account for fixed costs like software, warehouse rent, marketing, or salaries that exist regardless of subscriber count.

What sits outside this contribution margin

Contribution model. Creative and ads sit outside COGS unless you add them to other cost. Customer acquisition cost (ad spend, influencer fees, free-trial boxes) isn't in this per-box math at all -- a healthy 36.99% unit margin can still lose money overall if acquisition cost per subscriber exceeds their lifetime value.

Churn matters more here than the per-box margin alone: 180 active subscribers generating $2,996.10/month assumes that subscriber count holds steady, but subscription boxes typically see meaningful month-over-month churn that erodes this figure faster than new signups replace it.

Payment fee (2.9% + $0.30) is applied per box, so raising the price to improve margin also raises the dollar amount of the percentage-based fee slightly -- the net gain from a price increase is always a little less than the sticker increase suggests.

Related subscription and fulfillment math

For the subscriber-count side of this business -- growth rate, churn, and monthly recurring revenue trend -- the Subscription MRR Growth Calculator tracks that separately from per-unit margin.

If inventory sitting in a warehouse between fulfillment cycles is a meaningful cost, the Inventory Holding Cost Calculator prices that carrying cost separately from COGS.

Frequently Asked Questions (FAQ)