How to calculate margins when reselling custom brass jewelry?

Start with a per-unit COGS that includes: material brass alloy weight cost, plating or coating, labor (assembly, setting, polishing), stones or components, packaging, inbound freight, import duties, and per-unit tooling amortization (tooling cost ÷ expected run quantity). Gross margin formula: Gross Margin = (Selling Price - COGS) ÷ Selling Price. Example (labeled): if selling price = $80 and COGS = $32, gross margin = (80 - 32) ÷ 80 = 0.60 or 60%. Always calculate margin on the net received price after marketplace deductions when selling through third-party channels.

Variable costs are direct, per-unit expenses that scale with production volume: brass raw-material cost by gram, plating/finish per-piece, stones/findings, per-piece labor time × labor rate, consumables, per-unit inbound shipping, and payment-processing fees. Exclude fixed overhead initially but prepare to allocate a per-unit share of fixed costs (rent, salaried design, core equipment depreciation) to get a true landed cost. Track batch-level variances—scrap rate, rework hours—and fold an appropriate contingency percentage into COGS for more conservative pricing.

Model alloy and finish as separate line items: calculate the brass cost by weight using current metal purchase invoices and expected scrap percentage. For plating or lacquering, track process yield (parts that need rework or additional coats) and include the marginal cost per successful finished piece (plating chemistry, labor, rinse, electricity, reject rate). For margin sensitivity, create a two-way scenario: run a base-case with contracted unit material prices and a stress-case with +10–20% material or finish costs; assess required price increases or margin compression to maintain target profit.

Avoid arbitrary percentages; define target margin and calculate markup from that. Relationship: Markup = (Price - Cost) ÷ Cost, Margin = (Price - Cost) ÷ Price. For example, a 60% margin equals a 150% markup (Price = Cost × (1 + Markup)). Industry practice varies by channel—retail boutiques typically price to margin targets that absorb higher overhead and customer experience costs, while wholesale prices are lower but sold in volume. Use your fixed-cost allocation and sales volume forecasts to derive the required markup to hit net profit targets rather than relying on rule-of-thumb percentages.

Start with gross margin per unit, then subtract operating deductions to get net profit per unit: Net Profit = Selling Price (net of channel fees) - COGS - Allocated Overhead - Returns Provision - Warranty Reserve - Inventory Shrinkage - Marketing CAC (per-sale). Build reserves using your historical rates; if none, run conservative assumptions (e.g., returns or warranty claims mapped to similar jewelry categories) and update with real data. Example method: if 5% of revenue is expected in returns, convert that to a per-unit deduction and remove it before calculating net margin to ensure pricing covers expected post-sale costs.

Create a channel-specific net-price model for each route-to-market: start with list price, subtract channel commissions, payment-processing fees, fulfillment & shipping costs, returns handling, and promotional discounts to get the net realized price. Then compute margin using that net price. For wholesale, model Minimum Order Quantities (MOQs), net payment terms (e.g., 30/60/90 days), and volume discounts—these affect working-capital cost and effective margin. Use a simple spreadsheet with variables for fees, return rates, and CAC so you can run scenarios (best, base, worst) and determine the minimum price or lowest acceptable COGS to meet your margin thresholds.