Yield Rate
Yield rate is the percentage of manufactured units that pass quality control and are sellable. A yield rate below 95% significantly impacts effective COGS and signals a supplier quality problem that needs addressing.
What is Yield Rate?
Yield rate = (Sellable Units Produced ÷ Total Units Produced) × 100. If a manufacturer produces 1,000 units but 60 fail quality inspection, yield rate is 94%. The 60 rejected units still incur production costs — those costs are spread across the 940 sellable units, increasing effective COGS. A 10% yield loss on a $5 COGS product increases effective COGS to $5.56 (5 ÷ 0.94).
Low yield rates are a hidden COGS inflator that many sellers don't account for because they only invoice for accepted units. But if your supplier charges you for accepted units and absorbs the rejects, that cost is already baked into their quoted price — which is why getting quality yield data is important during supplier negotiation.
Yield rate also affects delivery reliability. If your order is for 1,000 units and yield rate is 88%, you'll receive approximately 880 units — potentially leaving you short for a launch or restock. Always order 5–10% above your required quantity for categories with known yield variability (textiles, electronics, food products).
Why it matters for sellers
A yield rate drop from 97% to 90% on a $6 COGS product increases effective unit cost from $6.19 to $6.67 — a 7.8% COGS increase that directly compresses gross margin. At $500k annual COGS, a 7.8% unplanned increase is $39,000 in additional costs. Monitoring yield rate per supplier is as important as monitoring their quoted price.
How to use Yield Rate
Request yield rate data from your manufacturer during due diligence and after each production run. Specify in your purchase order that defective units must be documented and reported, with a defined defect threshold (e.g., 'reject rate not to exceed 3%'). If reject rate exceeds threshold, negotiate a price reduction or replacement units at supplier cost.
Hire a third-party inspection company (QIMA, Bureau Veritas, SGS) for pre-shipment inspections, especially on new suppliers. Inspectors check a statistical sample of units and report yield rate, defect types, and severity — giving you data to accept/reject or renegotiate before goods ship.
Real-world example
A brand ordering 2,000 units of a glass candle jar (COGS $3.40/unit) assumes a 97% yield rate based on prior runs. The latest shipment from a new production line has 11% breakage discovered at FBA check-in. 220 units are unsellable. Effective COGS on the 1,780 sellable units: ($3.40 × 2,000) ÷ 1,780 = $3.82/unit — a 12.4% COGS increase. The brand mandates pre-shipment inspection for all future glass orders and adds a fragile packaging spec to the purchase order.
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Frequently asked questions about Yield Rate
What is an acceptable yield rate for manufactured products?
95%+ is generally acceptable for most hard goods and consumables. 97%+ is the target for precision products (electronics, glass, ceramics). Textile yield (fabric waste, cutting losses) is typically 85–92% by material but unit yield (sellable garments) should be 97%+. Any category with consistent yield below 93% warrants a root cause conversation with the manufacturer and potentially a supplier change.
How do I handle defective units from Amazon FBA?
FBA checks units on receipt and may quarantine unsellable units — you can see these in your Unfulfillable Inventory report. You can request removal (shipped back to you for inspection/rework/disposal), or request FBA to destroy them (at a per-unit destruction fee). For high-value products, request removal and assess whether units can be reworked. For low-value products, destruction is often cheaper.
Should my supplier absorb the cost of defective units?
It depends on your supplier contract. Many Chinese manufacturers will replace defective units found during pre-shipment inspection at no charge if the inspection is conducted before shipment. For defects discovered after delivery, recovery depends on your contract — typically, suppliers are liable for manufacturing defects but not damage occurring after shipment. Always document defects with photos and get independent inspection reports to support any claims.