The Unit Economics Calculator: Building a Profitable LED Therapy Brand from Scratch

Table of Contents

• 1. The Components of Landed Cost
• 2. The Model in Practice: Building the Unit Economics Spreadsheet
• 3. The Break-Even Points That Matter
• 4. The Price Setting Framework
• 5. The Scenario Analysis That Prevents Bad Decisions
• 6. The Metrics to Track Monthly
• 7. The Common Mistakes the Model Would Have Prevented

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1. The Components of Landed Cost

Before you can calculate margin, you need the full cost of getting a product from factory to customer. The five layers:

Layer	Typical items
Manufacturing (per unit)	Factory unit cost from the OEM/ODM; packaging materials (outer box, protective inserts, manual, warranty card); accessories (charging cable, carrying case, bundles)
Shipping (per unit)	FOB price covers factory cost to port; ocean freight (container ÷ units); port handling and terminal charges; customs duties and brokerage; inland freight (port → warehouse); last-mile delivery (if FBA or direct fulfillment)
Fulfillment (per unit)	Pick-and-pack (warehouse or 3PL); storage (monthly, prorated); return-processing fee
Transaction (per unit)	Payment processing (typically ~2.9% + $0.30 per card transaction); platform fees (Amazon referral, marketplace listing, Shopify transaction); advertising per unit (ACoS × average order value)
Other / acquisition (amortized)	Marketing and organic acquisition attributed per unit; warehousing overhead (rent, labor, systems); inventory insurance; cost of capital tied up in inventory (opportunity cost)

(Full landed-cost methodology: calculating true landed cost.)

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2. The Model in Practice: Building the Unit Economics Spreadsheet

Use a spreadsheet — don’t try to do this in your head. Build these columns:

• Column 1 — Unit selling price: scenarios for wholesale, MSRP, Amazon, DTC
• Column 2 — Unit manufacturing cost: factory price + packaging + accessories
• Column 3 — Shipping per unit: (container cost ÷ units per container) + duties + port fees + inland freight
• Column 4 — Gross margin per unit: selling price − manufacturing − shipping
• Column 5 — Platform fees: channel-specific (see below)
• Column 6 — Advertising cost: trailing-90-day ACoS applied per unit
• Column 7 — Return-rate cost: return rate × handling cost (replacement + shipping)
• Column 8 — Net margin per unit: all revenue minus all costs
• Column 9 — Working-capital cost: units in pipeline × unit cost × months in pipeline × cost-of-capital rate

Worked shipping example (illustrative; a 40-ft container, Shenzhen → US West Coast, 2,800 units):

• Container: $3,200 → $1.14 per unit
• Duties: illustrative 25% tariff on a $25 unit cost = $6.25 (Section 301 and related rates are time-sensitive and HS-classification dependent — verify current rates before modeling; see our tariff strategy guide)
• Port and brokerage: $0.40
• Inland freight: $0.50
• Total shipping per unit: $8.29

Working-capital example: 3 months of inventory on hand, $25 unit cost, 10% annual cost of capital → 3 months × (10% ÷ 12) × $25 = $0.63 per unit.

(Pricing-model context: B2B pricing model for OEM/ODM services.)

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3. The Break-Even Points That Matter

• What’s your minimum viable wholesale price? For a given retail point, what’s the maximum manufacturing + shipping cost that still hits your gross-margin target (commonly 50%+ for consumer brands)? Example: $79 target retail at 55% gross margin → maximum total cost $79 × 0.45 = $35.55; with $12 shipping/fulfillment, maximum manufacturing cost ≈ $23.55.
• What’s your Amazon break-even ACoS? At current price and unit economics, the maximum advertising cost per sale that still leaves you profitable.
• What’s your minimum-order-quantity ROI? Per-unit manufacturing cost typically falls as order size rises — at what size does the saving justify the extra working capital tied up?

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4. The Price Setting Framework

A three-tier structure is common for LED therapy devices (typical planning ranges):

Tier	Setting
MSRP	Creates perceived value and supports retail-channel margins; typically ~2.5–3.0× landed cost
Wholesale	Offered to distributors/retailers; typically ~40–50% off MSRP (≈55% retailer margin), i.e., ~1.2–1.5× landed cost
DTC	Your own website; typically equal to or slightly below MSRP
Amazon	Set by the market, not by you — if landed cost can’t support competitive Amazon pricing with profit, don’t sell on Amazon

Channel fee context (illustrative — verify current schedules): Amazon ~15% referral plus fulfillment; wholesale typically ~10% payment processing only; DTC ~2.9% + $0.30 per transaction. (More: B2B pricing strategy 2026, multi-channel pricing strategy, panel vs mask cost & margin.)

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5. The Scenario Analysis That Prevents Bad Decisions

Before committing to any new product, run three scenarios through your model:

• Optimistic: best-case pricing, lowest shipping, no damage returns
• Base: expected pricing, standard shipping, average return rate
• Pessimistic: competitive price pressure, peak shipping rates, high return rate

Decision rule: if the pessimistic scenario still shows positive gross margin, the product is worth pursuing; if the base case is marginal, proceed with caution; if the base case is negative, walk away.

The question to ask before any launch: “What needs to be true for this product to be profitable?” If you can’t name the specific conditions, and can’t reliably create them, don’t launch.

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6. The Metrics to Track Monthly

• Gross margin by SKU (manufacturing + shipping vs. revenue)
• Net margin by SKU (after fulfillment, transaction, and advertising costs)
• Inventory days on hand (days of stock at current sales rate)
• Cash conversion cycle (days from paying supplier to collecting from customer)
• ACoS by product and channel
• Return rate by product

These six, tracked monthly, show whether the business is economically sustainable.

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7. The Common Mistakes the Model Would Have Prevented

• Mistake 1 — Pricing from competitors, not from costs. If your landed cost is $40 and competitors sell at $65, the answer isn’t “cut margin to $65” — it’s “reduce landed cost to ~$28 or don’t enter that segment.”
• Mistake 2 — Ignoring working-capital costs. A 20% gross-margin product needing 6 months of inventory at 12% cost of capital is really ~14% margin. The model catches this.
• Mistake 3 — Pricing before knowing landed cost. A frequent failure: setting MSRP before a real manufacturing quote, then negotiating a factory price that leaves the product underwater. Know landed cost before announcing pricing.
• Mistake 4 — Confusing gross and net margin. 60% gross looks great until $18 Amazon fees + $12 advertising + $2.50 returns leave ~15% net. Track both.

Build the model. Run the numbers. Put every new-product decision through it before committing inventory capital — the brands that fail usually aren’t bad at marketing or sales; they’re bad at math. (Multi-currency pricing for global trade: managing multi-currency pricing and payments.)

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Get the Real Numbers to Run Your Model

Rainbow provides manufacturing quotes with packaging options, sample units for QC, and specification documentation — the inputs your unit-economics model needs. Start with OEM/ODM manufacturing, review the product lineup, or contact us for a quote package.