Does the cost per part fall as the next run grows?

Yes. The swap and labor adders stay fixed, so a longer run spreads them across more parts. Lost throughput rises in step with the run, which is why small batches look expensive per part.

Should I include scrapped ramp-up parts in this cost?

This page leaves them out. If first-off parts are scrapped, add their material and lost time as a separate cost, or raise the throughput cost per part to cover it.

Why is lost throughput charged per part in the next run?

Because the changeover stops a cell that would otherwise make that next run. The minutes lost translate into parts not made, so the run size sets how much output the changeover displaces.

Is fixture swap cost a one-time cost for this changeover?

Yes, unless the fixture is rebuilt or replaced. Enter the labor, hardware and outside service it takes to swap, and leave the fixture's capital cost in the cell budget where it belongs.

Robotics & Automation calculator

Robot Changeover Cost Calculator

Add up what one robot cell changeover costs: the throughput lost while the cell stops, plus the fixture and tooling swap, labor and overhead. Cost per part shows how the changeover burden spreads across the next run.

What this calculator does

Total cost of a robot cell changeover, from lost throughput across the next run plus fixture, tooling and labor adders.

Formula used

Lost throughput cost = parts in the next run × lost throughput cost per part
Changeout adders = fixture and EOAT swap cost + labor and overhead cost
Total changeover cost = lost throughput cost + changeout adders
Cost per part = total changeover cost ÷ parts in the next run

Inputs explained

Parts in the Next Run: Parts the next production run makes once the changeover ends.
Lost Throughput Cost per Part: Contribution each part would have made while the cell was stopped.
Fixture and EOAT Swap Cost: Fixture, tooling and outside service cost of the swap.
Labor and Overhead Cost: Clock time cost of the crew and plant overhead for the changeover.

How to use the result

Best suited to setting economic run quantities, justifying a quick-change fixture, pricing small mixed-model batches.
Lost throughput cost per part is an average; short runs with scrap and ramp-up can cost more. The total compares changeovers for planning; it is not a quote for the customer.

Current U.S. benchmarks

Global copper trades at $13,543 per tonne (IMF via FRED, Jul 2026), up 38.6% in a year, and U.S. industrial electricity averages 9.77 cents per kWh. Both feed electrified-hardware unit economics.

Common questions

Does the cost per part fall as the next run grows? Yes. The swap and labor adders stay fixed, so a longer run spreads them across more parts. Lost throughput rises in step with the run, which is why small batches look expensive per part.
Should I include scrapped ramp-up parts in this cost? This page leaves them out. If first-off parts are scrapped, add their material and lost time as a separate cost, or raise the throughput cost per part to cover it.
Why is lost throughput charged per part in the next run? Because the changeover stops a cell that would otherwise make that next run. The minutes lost translate into parts not made, so the run size sets how much output the changeover displaces.
Is fixture swap cost a one-time cost for this changeover? Yes, unless the fixture is rebuilt or replaced. Enter the labor, hardware and outside service it takes to swap, and leave the fixture's capital cost in the cell budget where it belongs.

Last reviewed 2026-10-01.