Cost of goods (COGS)
Every per-box variable cost
Fitness
Fitness Subscription Box Calculator
Fitness and supplement subscription boxes sit at the intersection of curation and replenishment - subscribers discover new products through the box but often reorder favorites directly, which reduces the box's long-term value. The most successful fitness boxes either lean into the discovery angle with genuinely novel products each month or build a full-size replenishment model around consumable supplements. See the real per-box math — COGS, platform fees, gross profit — plus LTV, CAC payback, and the exact subscriber count you need to break even.
- 40-50%Healthy gross marginIndustry benchmark
- 3:1+Healthy LTV:CACAbove this you can scale ads
- <6 moCAC payback targetRecover acquisition cost fast
- FreeAlwaysNo sign-up needed
Live calculator
Enter your numbers
Defaults reflect a typical 100-subscriber curated box at $39.99 with 7% monthly churn. Edit any input — every metric updates instantly.
Price & platform
Subscription price and where you charge it
Subscribers & churn
Active base and retention curve
Acquisition
CAC and monthly marketing budget
Category insight
Fitness boxes work best when they sell ongoing need instead of one-time curiosity. Supplement replenishment, exclusive formulations, and private-label products keep the subscription relevant after the first discovery moment.
Live unit economics
$12.41 gross profit per box · 28% margin
Producing monthly net profit of $165.01 after fixed overhead and marketing. Healthy LTV:CAC of 5.54:1 means you can scale acquisition.
Gross profit / box$12.41After COGS + platform fees
Gross margin28%Healthy: 40-50%
MRR$4,499.00100 subs × $44.99
Monthly net profit$165.01After overhead + marketing
LTV & CAC
Lifetime value vs. acquisition cost
The two numbers that decide whether you can profitably scale acquisition. Below 3:1 LTV:CAC, paid ads are a leak; above, you can grow.
Customer lifetime
14.3mo
At 7.0% churn
LTV
$177.29
Gross profit × lifetime
LTV : CAC
5.54: 1
Healthy 3:1+ · scale 5:1+
CAC payback
2.6mo
Healthy under 6 months
Break-even
What it takes to cover fixed costs
Subscribers needed to break even on monthly overhead and how long it takes to get there at your current acquisition rate.
Break-even subscribers
40 subscribers
You need 40 paying subscribers just to cover $500.00 monthly overhead. You currently have 100 — comfortably above break-even by 60 subscribers.
Growth gap / month+11.018 new − 7.0 churned
Months to break-even3.7At current growth
Lost subs / month7.0At 7.0% churn
12-month projection
Where the math takes you
MRR and monthly net profit projected over 12 months at your current acquisition and churn rates.
MRRMonthly net profit
M1 MRR$4,994
M12 MRR$8,609
M12 net$1,299
| Month | Subscribers | MRR | Gross profit | Net profit |
|---|---|---|---|---|
| M1 | 111 | $4,993.89 | $1,377.52 | $301.52 |
| M3 | 131 | $5,882.17 | $1,622.54 | $546.54 |
| M6 | 155 | $6,994.73 | $1,929.44 | $853.44 |
| M9 | 175 | $7,889.63 | $2,176.28 | $1,100.28 |
| M12 | 191 | $8,609.44 | $2,374.84 | $1,298.84 |
Fitness benchmarks
Where your numbers should land
Industry benchmarks to compare your numbers against. Use them as targets to steer the inputs toward.
Average price range
$30-$50/month
Common for fitness and supplement boxes.
Typical gross margin
40-50%
Discovery and replenishment can both work.
Average monthly churn
6-8%
Direct-to-consumer leakage is common.
Average items per box
4-8
Supplements, gear, or accessories.
Key churn driver
Cheaper direct alternatives
Subscribers reorder favorites directly.
Key opportunity
Supplement replenishment model
Consumables create genuine recurring need.
Method
Supplement vs gear boxes
Supplement-focused fitness boxes benefit from natural replenishment - subscribers run out of protein powder, pre-workout, or vitamins and need more. This creates much lower churn than gear or accessories boxes where subscribers accumulate items they already have.
Compounding
The direct-to-consumer leakage problem
A common fitness box failure mode is subscribers loving a product discovered in the box, buying it directly from the brand at lower cost, and canceling the subscription. Combat this with exclusive formulations, private-label products, or brand partnerships where your box gets exclusive flavor or size variants.
FAQ
Questions about profit math
Seven questions founders ask most when reading their profit numbers.
Q01What's a healthy gross profit per box?
$15-$20 per box at 40-50% margin is the healthy zone for typical curated boxes at $35-$45 price points. Below $10 gross profit, fixed overhead and acquisition costs eat too much of every box for the model to scale. The number matters because every other metric on this page (LTV, CAC payback, break-even subscribers) is derived from gross profit per box — fixing gross profit is the most leveraged single change you can make.
Q02Why does LTV:CAC of 3:1 matter so much?
Below 3:1, paid acquisition is unprofitable in any meaningful sense — you spend $1 to acquire a customer worth less than $3 of gross profit, leaving no room for overhead, retention work, or product investment. Above 3:1, you can scale acquisition aggressively. 5:1+ means you're under-spending on acquisition and could grow faster. 1:1 to 2:1 means you have a fundamental margin or churn problem, not an acquisition problem.
Q03What does CAC payback really mean?
CAC payback is how many months it takes for a subscriber's gross profit contribution to recover their acquisition cost. Under 6 months is healthy because most subscription-box churn happens in months 2-4 — short payback means you recover CAC before the bulk of churn hits. Above 12 months is dangerous; you'd need very low churn for most subscribers to ever turn profitable, and that's rarely true for newer boxes.
Q04What's the difference between gross profit and net profit?
Gross profit = revenue minus variable per-box costs (COGS + platform fees). Net profit = gross profit minus fixed overhead (rent, software, salaries) minus marketing spend. The split matters because gross profit tells you whether each box itself is profitable; net profit tells you whether the business as currently structured is profitable. A box can have healthy unit economics but a negative net profit if fixed overhead is too high — and that's usually the right kind of problem to have (you can scale into the overhead).
Q05Why does the projection assume constant new subscribers and churn?
The 12-month projection holds new subscribers and churn rate constant to isolate the compounding effect of your current numbers. In reality both move — acquisition tends to vary with marketing spend and seasonality, and churn often drops slightly as your base shifts toward longer-tenure subscribers. For a more sophisticated 24-month model with scenario comparison, use the Growth Simulator.
Q06How should I think about break-even subscribers?
Break-even subscribers = monthly fixed overhead ÷ gross profit per box. At $500 overhead and $15 gross profit per box, that's 34 subscribers just to cover overhead. Below that, you're losing money every month even before marketing spend. Above it, every additional subscriber adds gross profit straight to net. Most new boxes underestimate fixed overhead because they don't include their own time at a real labor rate — add at least $1,000-$2,000/month if you're full-time on the box.
Q07Should I include my own labor in fixed overhead?
Yes. If you're working full-time on the box, your time has a cost — usually $3,000-$8,000/month at a realistic founder salary. Excluding it gives you a flattering net profit number that doesn't match reality. The honest test: would this business support paying someone else (not you) to do this work and still produce a profit? If not, the current model isn't sustainable; either margin or scale needs to improve.
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