How to Calculate and Compare Supplier Quotes Accurately

The Unit Price Trap

When comparing suppliers, it's tempting to simply pick the one with the lowest unit price. But the cheapest quote rarely means the lowest actual cost. Different suppliers may quote on different terms, exclude certain costs, or offer varying payment conditions.

Key Factors Beyond Unit Price

Incoterm Differences

Supplier A quotes $4.50 EXW while Supplier B quotes $5.20 FOB. Which is cheaper? You can't tell without calculating the missing costs:

• EXW $4.50 + local transport ($0.30) + export clearance ($0.20) + loading ($0.15) = $5.15 equivalent FOB
• FOB $5.20 already includes these costs

Supplier B is only $0.05 more expensive when compared on the same basis — not the $0.70 gap that the initial quotes suggest.

Minimum Order Quantities (MOQs)

• Supplier A: MOQ 500 units at $5.00 each = $2,500 committed
• Supplier B: MOQ 2,000 units at $4.20 each = $8,400 committed

The lower unit price requires 3.3x more capital and inventory risk. For a new product, the higher per-unit cost with a lower MOQ might be the smarter choice.

Payment Terms

• Supplier A: 100% upfront before production
• Supplier B: 30% deposit, 70% before shipment

Supplier B's terms give you more time before you've paid the full amount, improving your cash flow and reducing your risk.

Lead Time

• Supplier A: 15-day production time
• Supplier B: 45-day production time

Faster production means shorter cash-to-cash cycles and the ability to reorder more responsively. This has a real financial value.

Quality and Defect Rates

If Supplier A has a 5% defect rate and Supplier B has a 1% defect rate, you need to factor in:

• Cost of defective units (wasted landed cost)
• Returns and customer satisfaction impact
• Re-inspection or rework costs

Building a Comparison Spreadsheet

Create a standardised template that normalises all quotes to the same basis:

Requesting Quotes Effectively

To get comparable quotes:

1. Send the same specification to all suppliers — identical product specs, materials, and requirements
2. Specify the Incoterm you want quoted on — FOB is the most common for comparison
3. State your target quantity — ask for prices at multiple quantities (e.g., 500, 1000, 2000 units)
4. Ask about all costs — packaging, labelling, custom branding, tooling or mould charges
5. Request a timeline — production time, not just delivery time

Hidden Costs to Ask About

• Mould or tooling charges — for custom products, these can be significant
• Sample costs — some suppliers charge for samples, others don't
• Packaging upgrades — the default packaging may not be adequate for retail or FBA
• Labelling — custom labels, barcodes, or compliance marks
• Testing and certification — some suppliers include this, others don't
• Volume discounts — what quantities trigger price breaks?

Making the Final Decision

Price matters, but it's rarely the only factor. Weight your decision based on:

1. Total landed cost (50% weighting) — the true cost, not just the unit price
2. Quality evidence (25% weighting) — samples, test reports, references
3. Reliability indicators (15% weighting) — communication, responsiveness, certifications
4. Terms and flexibility (10% weighting) — payment terms, MOQ flexibility, lead times

The best supplier relationship balances cost, quality, and reliability. The cheapest option that fails to deliver on time or sends defective goods is the most expensive choice you can make.