How do I check a supplier's production capacity?

How do I check a supplier's production capacity?

Check a supplier’s production capacity by asking for output rates, available shifts, equipment details, workforce and bottleneck information, current workload, and realistic lead times. Verify the claims through production records, factory visits, references, or an independent audit. Confirm whether subcontractors are involved and whether the supplier can meet your required quantity consistently, not just once.

Ask for measurable capacity data

Request nominal and practical output per day, week, or month; number of production lines; working shifts; setup times; yield rates; and capacity reserved for existing customers. Ask suppliers to explain the assumptions behind their figures and distinguish maximum theoretical capacity from available capacity.

Identify bottlenecks and subcontracting

A factory’s capacity may be limited by one machine, a specialist process, raw-material supply, labor availability, testing, or packaging. Ask which processes are performed in-house, which are outsourced, and whether subcontractors have been assessed. Confirm how material shortages or equipment failures would affect delivery.

Verify the claims with evidence

Where appropriate, review production schedules, anonymized output records, equipment lists, quality records, and past delivery performance. A site visit or independent factory audit can help establish whether the facility and process match the supplier’s claims. Protect confidential information when requesting records.

Test capacity through a controlled order

Use a pilot order or production run to measure actual output, defect rates, communication, and delivery reliability. Agree on milestones and acceptance criteria, then monitor performance as order volume increases. A factory that can produce a sample may not yet be able to maintain quality at scale.

Capacity verification should assess sustainable, available output rather than a single headline number. Match the evidence to your order size, required schedule, product complexity, and business continuity needs.