Compare the complete cost of external metal fabrication with the estimated cost of producing the same work internally.
When one option has higher fixed costs but lower variable cost, the production quantity can change which option is more economical.
The calculator treats internal fixed costs as job-level costs for the selected comparison. If a cost is already included in your machine or labor rate, do not enter it again as a separate allocation.
A supplier quotation is not always the complete outsourcing cost. Freight, packaging, inspection, tooling, handling, engineering charges and other purchasing-related expenses can materially change the final cost.
For a meaningful comparison, use the delivered and accepted cost of the outsourced work rather than comparing only the supplier's unit price with internal labor.
In-house fabrication requires more than direct wages. Machine ownership, maintenance, energy, consumables, material waste, tooling and shop overhead can all contribute to the actual internal cost.
Material waste can make the effective internal material cost higher than the purchase price of the raw stock. Cutting patterns, offcuts, defects and fabrication losses can all affect material consumption.
For example, a $10 material cost with 10% waste represents an effective material consumption cost of $11 per finished part.
The labor rate should ideally represent the loaded cost of the employee rather than only the nominal hourly wage. Depending on how your shop accounts for labor, this may include payroll costs, benefits, paid non-production time and other employment costs.
Machine cost can include depreciation, financing or lease cost, maintenance, tooling, energy and other ownership-related expenses. If these costs are already captured in an hourly machine rate, avoid double counting them elsewhere.
Outsourcing may be attractive when the internal shop has limited capacity, requires expensive specialized equipment, has low utilization or lacks the process capability needed for the job.
It can also reduce the need for additional capital investment when demand is uncertain.
Internal production can become attractive when the shop already owns the required equipment, has available capacity and can produce the work at a lower variable cost than the supplier's delivered price.
Higher production volumes can make internal fixed setup and tooling costs less significant on a per-part basis.
If outsourcing has a higher fixed cost but lower variable cost, or vice versa, the quantity at which the two approaches have equal cost can be estimated.
The result is meaningful only when the denominator is positive and the cost assumptions remain valid across the quantity range being evaluated.
The lower calculated cost does not automatically make an option better. Lead time, quality, supplier reliability, intellectual property, capacity, inspection requirements, delivery risk and minimum order quantities can influence the final decision.
Use the cost comparison as one part of a sourcing decision rather than as a substitute for technical and commercial evaluation.
How do I compare outsourcing with in-house fabrication?
Calculate the complete delivered outsourcing cost and compare it with the complete internal production cost, including material, labor, machine time, consumables and appropriate overhead.
Should material waste be included?
Yes. Raw material consumption should reflect the expected cutting and fabrication waste.
Should machine depreciation be included?
It can be included through the machine hourly rate or as a separate allocation, but the same cost should not be counted twice.
Should shipping be included in outsourcing?
Yes, when transportation is an actual cost of purchasing the fabricated product.
Can outsourcing be cheaper even when the supplier's unit price is higher?
Yes. If internal setup, labor, machine ownership, overhead or other costs are substantial, the complete in-house cost can exceed the supplier's delivered cost.
Can in-house production become cheaper at higher quantities?
Yes. Internal fixed costs can be spread across more parts, potentially reducing the average internal cost per part.
What is the most important number in the comparison?
The total cost for the actual order quantity is usually the most useful starting point, followed by cost per part and the break-even quantity.
Does the calculator consider production capacity?
The cost calculation does not automatically value lost capacity or production bottlenecks. Those should be considered separately when comparing sourcing options.