How to Calculate Unit Economics for a Digital Goods Store
Short Answer
Unit economics for a digital goods store measure profitability at the level of a single transaction and a single customer over time. The core calculation: per-order profit = retail price − wholesale cost − payment fee − FX buffer − refund reserve. Customer-level economics add customer acquisition cost and lifetime value. Before scaling, both calculations must be positive. A digital goods store with positive per-order economics but negative unit economics (because CAC exceeds LTV) is burning money at scale.
Definition: Unit economics for a digital goods store is the measurement of revenue, cost, and profit associated with a single order and a single customer — calculated to verify that each marginal sale generates real profit, and that acquiring a new customer generates more lifetime value than it costs.
Key takeaway: Digital goods stores frequently look profitable at a gross margin level but break even or lose money once payment fees, refund rates, and customer acquisition costs are included. Model all four cost components before claiming the business is viable: wholesale cost, payment processing, refund reserve, and CAC.
Who This Guide Is For
- Founders building a digital goods store and modeling viability
- Operators scaling an existing store and evaluating profitability drivers
- Investors and finance teams reviewing a digital goods reseller's economics
Level 1: Per-Order Unit Economics
Formula:
Net profit per order = Retail price
− Wholesale cost
− Payment processing fee
− FX buffer (if applicable)
− Refund reserve
Net margin per order (%) = Net profit ÷ Retail price × 100%
Example: Steam Gift Card $20 — US (Illustrative)
| Item | Amount |
|---|---|
| Retail price | $20.00 |
| Wholesale cost (8% discount) | $18.40 |
| Gross margin | $1.60 |
| Payment processing (2.5%) | $0.50 |
| FX buffer (0% — USD product) | $0.00 |
| Refund reserve (0.5% of retail) | $0.10 |
| Net profit per order | $1.00 |
| Net margin | 5.0% |
Example: Steam Gift Card 100 TRY — Turkey (Illustrative)
| Item | Amount |
|---|---|
| Retail price | $3.20 (USD equivalent) |
| Wholesale cost | $2.80 |
| Gross margin | $0.40 |
| Payment processing (2.5%) | $0.08 |
| FX buffer (8%) | $0.26 |
| Refund reserve (0.5%) | $0.02 |
| Net profit per order | $0.04 |
| Net margin | 1.3% |
Turkey Steam at thin margins: the absolute dollar profit per order is very low. Volume and risk control are critical.
Level 2: Channel-Adjusted Unit Economics
Different sales channels have different cost structures:
| Channel | Payment Fee | Marketplace Fee | Net Margin Impact |
|---|---|---|---|
| Own website (card) | 2–3% | 0% | Baseline |
| Own website (crypto) | 0.5–1% | 0% | +1.5–2% vs card |
| Telegram bot (TON) | 0.1–0.5% | 0% | +2%+ vs card |
| Gaming marketplace | 2–3% | 5–15% | −5–15% |
| App store (Apple/Google) | 2–3% | 15–30% | −15–30% |
If your per-order margin at a gaming marketplace with a 15% commission is negative, selling through that channel destroys value regardless of volume.
Level 3: Customer Lifetime Value (LTV)
A digital goods store's profitability depends not just on single orders but on how many times the same customer returns.
LTV formula:
LTV = Average order value × Gross margin % × Average orders per customer per year × Customer lifetime (years)
Example (Illustrative):
- Average order value: $20
- Gross margin: 7%
- Orders per year: 6 (monthly buyer)
- Customer lifetime: 2 years
LTV = $20 × 7% × 6 × 2 = $16.80
After subtracting per-order variable costs (net margin 5%):
LTV (net) = $20 × 5% × 6 × 2 = $12.00
Level 4: Customer Acquisition Cost (CAC)
CAC = Total marketing spend ÷ Number of new customers acquired
For a digital goods store spending $500/month on ads to acquire 100 new customers:
- CAC = $5.00 per customer
LTV:CAC ratio:
- LTV (net) = $12.00
- CAC = $5.00
- Ratio = 2.4:1
A ratio above 3:1 is generally considered healthy. Below 1:1 means you are losing money acquiring customers.
Sensitivity Analysis
How net margin changes with key inputs:
| Wholesale Discount | Payment Fee | Net Margin |
|---|---|---|
| 6% | 2.5% | 2.5% |
| 7% | 2.5% | 3.5% |
| 8% | 2.5% | 5.0% |
| 8% | 1.0% (crypto) | 6.5% |
| 10% | 1.0% | 8.5% |
| 10% | 0% | 9.5% |
A 2% improvement in wholesale discount — achievable through volume negotiation — has the same impact as eliminating payment fees entirely.
Breakeven Analysis
Breakeven volume = Fixed costs ÷ Net profit per order
If fixed costs are $2,000/month (server, API, labor):
At $1.00 net profit per order → breakeven at 2,000 orders/month. At $0.50 net profit per order → breakeven at 4,000 orders/month.
| Monthly Fixed Cost | Net Profit/Order | Breakeven Orders/Month |
|---|---|---|
| $500 | $1.00 | 500 |
| $1,000 | $1.00 | 1,000 |
| $2,000 | $1.00 | 2,000 |
| $2,000 | $0.50 | 4,000 |
| $2,000 | $2.00 | 1,000 |
Common Unit Economics Mistakes
| Mistake | Impact |
|---|---|
| Calculating gross margin only (ignoring payment fees) | Overstated profitability by 2–3% |
| Not accounting for FX buffer on regional products | Margin compression or selling below cost |
| Not including refund reserve | Sporadic losses not reflected in model |
| Ignoring CAC (assuming organic traffic is free) | LTV:CAC looks infinite; CAC is actually time cost |
| Modeling one product at catalog average | High-margin products mask negative-margin products in the mix |
Checklist
- Model per-order net profit for each product in your catalog
- Include all four cost components: wholesale, payment fee, FX buffer, refund reserve
- Calculate net margin by channel (own store vs marketplace)
- Define average order frequency for your customer segment
- Calculate customer LTV (gross and net)
- Calculate CAC from your acquisition spend
- Calculate LTV:CAC ratio; target >3:1
- Calculate breakeven order volume for your fixed cost structure
- Run sensitivity analysis on wholesale discount and payment fee
- Remove negative-margin products from catalog or reprice them