Sample data pre-filled — a $35/month box with $12 COGS, $5 shipping, 8% churn, and $20 CAC. Replace with your numbers.

Your box economics

Enter per-box and per-subscriber numbers. The right panel computes contribution margin, LTV, and payback in real time.

Per box

$
$
$
%

Cratejoy ~11.25% + $0.10. Shopify Subscriptions ~2.9% + $0.30 + 1%. WooCommerce/own ~2.9% + $0.30.

Customer acquisition + retention

$
8%

Subscription-box industry avg: 10–15%/mo. Best-in-class: under 7%. Mature commerce (StitchFix S-1): ~7%.

Fixed costs + growth

$

Warehouse rent, software, design, owner salary.

Drives the 12-month projection. CAC × this = your monthly marketing spend.

Unit economics

The numbers an investor would ask for first.

Contribution margin
$16.78
47.9% of box price
Avg subscriber lifetime
12.5
at 8% monthly churn
LTV
$209.69
contribution × lifetime
CAC payback
1.2
months to recover $20.00
LTV : CAC ratio
10.5 : 1
World-class

Above 5:1 means you can scale aggressively. Consider whether you're leaving growth on the table by under-spending on acquisition.

Break-even point

48 subscribers
to cover $800.00/mo fixed costs
You have 150

You're past break-even. Each additional subscriber drops $16.78 to the bottom line every month.

12-month subscriber projection

At 25 new subs/month and 8% monthly churn from existing base.

Twelve-month subscriber and revenue projection
MonthSubscribersMonthly profit
Month 1163 $1,434.32
Month 2175 $1,635.62
Month 3186 $1,820.15
Month 4196 $1,987.90
Month 5205 $2,138.87
Month 6214 $2,289.85
Month 7222 $2,424.05
Month 8229 $2,541.47
Month 9236 $2,658.90
Month 10242 $2,759.55
Month 11248 $2,860.20
Month 12253 $2,944.08

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