How do you calculate make-buy breakeven volume capacity?

Multiply output per cycle by available cycles for gross capacity, then multiply by uptime and first-pass yield. With 4 units per cycle, 480 cycles, 90% uptime, and 97% yield, gross is 1,920 and good capacity is about 1,676 units.

Why is good capacity lower than gross capacity?

Gross capacity assumes the line never stops and never scraps a part. Applying 90% uptime removes 192 units to downtime, and 97% yield removes about 52 more to scrap, leaving roughly 1,676 good units from a 1,920-unit theoretical run.

What is a good first-pass yield to assume?

It varies by process, but mature, well-controlled lines often run 95-99% first-pass yield. New or complex processes can sit far lower. Use your measured yield, not an aspiration, since the example's 97% already strips out 52 units.

Should I use this for the make-or-buy decision?

Use it as the capacity gate. If good capacity comfortably exceeds demand, insourcing is feasible on volume; if it falls short, you either buy, add cycles, or improve uptime and yield. Cost is a separate test handled by a break-even cost calculator.

How do uptime and yield interact in the formula?

They are multiplied in sequence, so losses compound. 90% uptime times 97% yield equals about 87.3% overall, meaning gross 1,920 yields roughly 1,676 good units. Improving either lever lifts good capacity, and improving the worse one usually helps most.

What counts as a cycle here?

A cycle is one repeatable production event that produces the output-per-cycle quantity: a mold shot, a press stroke, a machine cycle, or a batch. Available cycles is how many of those you can run in the planning window after planned stops.

Make-Buy, Outsourcing & Network Design calculator

Make-Buy Breakeven Volume Calculator

This calculator estimates how many good, sellable units a process can actually deliver, starting from raw cycle output and then discounting for uptime and first-pass yield. Operations and make-buy planners use it to know whether in-house capacity can truly cover demand before committing to insource a part instead of buying it. It matters because gross capacity always overstates reality: a line that looks like it makes 1,920 units rarely ships that many once downtime and scrap are honest. Grounding the make-buy decision in good-unit capacity prevents the painful surprise of insourcing a part you cannot actually supply on time.

What this calculator does

Estimate make-buy breakeven volume for make-buy, outsourcing and network design using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.
Use it when make-buy breakeven volume in make-buy, outsourcing and network design is being asked to take on more work and you need to know if there is room.
It multiplies cycle output by available cycles for gross capacity, then derates that by uptime and first-pass yield to give realistic good-unit output.

Formula used

Gross make-buy breakeven volume capacity = make-buy breakeven volume output per cycle × available make-buy breakeven volume cycles
Good make-buy breakeven volume capacity = gross capacity × expected make-buy breakeven volume uptime × expected make-buy breakeven volume first-pass yield

Inputs explained

Make-buy breakeven volume output per cycle: Use the good units, parts, cavities, assemblies, tests, or batches completed each cycle.
Available make-buy breakeven volume cycles: Enter the planned cycles from the shift schedule, takt plan, asset plan, or run calendar.
Expected make-buy breakeven volume uptime: Use recent uptime or availability from production reports, maintenance logs, or OEE data.
Expected make-buy breakeven volume first-pass yield: Use first-pass yield from inspection, test, quality, or production records for the same scope.

How to use the result

Use it when deciding whether internal capacity can cover demand for a make-buy choice, or when sizing a line against an order quantity.
It uses single average values for uptime and yield and treats them as independent multipliers; it does not capture demand variability, rework recovery, or capacity shared with other parts.

Current U.S. benchmarks

Sourcing currencies as of 2026-07-02 (Federal Reserve H.10): 6.7886 CNY and 17.4524 MXN per USD. Landed-cost comparisons move with these daily rates.
U.S. iron and steel imports ran $2.1B in May 2026 (Census International Trade). The U.S. ran a trade deficit of $0.4B in the category that month. Import volumes are the pressure gauge behind tariff and reshoring decisions.

Common questions

How do you calculate make-buy breakeven volume capacity? Multiply output per cycle by available cycles for gross capacity, then multiply by uptime and first-pass yield. With 4 units per cycle, 480 cycles, 90% uptime, and 97% yield, gross is 1,920 and good capacity is about 1,676 units.
Why is good capacity lower than gross capacity? Gross capacity assumes the line never stops and never scraps a part. Applying 90% uptime removes 192 units to downtime, and 97% yield removes about 52 more to scrap, leaving roughly 1,676 good units from a 1,920-unit theoretical run.
What is a good first-pass yield to assume? It varies by process, but mature, well-controlled lines often run 95-99% first-pass yield. New or complex processes can sit far lower. Use your measured yield, not an aspiration, since the example's 97% already strips out 52 units.
Should I use this for the make-or-buy decision? Use it as the capacity gate. If good capacity comfortably exceeds demand, insourcing is feasible on volume; if it falls short, you either buy, add cycles, or improve uptime and yield. Cost is a separate test handled by a break-even cost calculator.
How do uptime and yield interact in the formula? They are multiplied in sequence, so losses compound. 90% uptime times 97% yield equals about 87.3% overall, meaning gross 1,920 yields roughly 1,676 good units. Improving either lever lifts good capacity, and improving the worse one usually helps most.

Last reviewed 2026-05-12.