What is faster changeover worth?
Every minute of setup is production time you do not get back, multiplied by how often you change over. Enter today's changeover and a target, and see the hours, units and euros you recover. Numbers update as you type.
Your line
One machine or line. Time a few real changeovers if you can: most plants remember the good ones, not the average.
Operating schedule
Where you stand
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See every changeover, timed automatically.
You cannot shrink what you do not measure honestly. The free OEE Tracker logs each shift and separates changeover from the rest of your downtime, so the current number on this calculator is a real one, not the changeover everyone remembers.
Open the free OEE TrackerThe minutes hide in the steps you never see.
Changeover time is full of small waits, searches and adjustments that a stopwatch on the floor misses. Fabrico tracks downtime live from PLCs, IoT sensors or AI cameras and, where cameras are fitted, puts the video of a stop next to its machine data, so SMED work starts from what happened, and a technician opens the work order from the stop when a problem repeats.
Book a Fabrico demo See how Fabrico tracks machine downtimeWhy changeover time is worth so much
Changeover is planned downtime, and on a line that changes over several times a day it can be one of the biggest OEE losses. Because the machine, labour and overhead are already paid for, every minute you give back becomes production you can sell at close to full contribution margin. That is why quick-changeover (SMED) programs so often pay back faster than any capital project: no new line, no new shift, just less time stopped.
The math
Annual value recovered = (current changeover - target changeover) in minutes, times changeovers per day, times operating days per year, divided by 60 for hours, times your ideal rate for units, times your margin per piece. The result scales with how often you change over, which is why high-mix lines have the most to gain.
Changeovers are frequent on cutting and forming machines, where blades, dies and settings change with each job. The guides for the band saw, cold saw, panel saw, roll forming machine and tube bender list the faults that make a changeover run long. Industry context: the machinery and fabrication and metals and foundry OEE and downtime pages.
A worked example: the numbers in the calculator
- Time back per changeover: 45 minutes now, 15 minutes as the target, so 30 minutes.
- Per day: 4 changeovers × 30 minutes = 2 hours of production back every day.
- Per year: 5 days × 50 weeks = 250 days, so 500 hours, and at 1,200 pieces an hour 600,000 pieces.
- Money: at €0.40 margin a piece, €240,000 a year, without buying anything.
The same numbers show why high-mix lines gain the most: double the changeovers to 8 a day and the value doubles to €480,000, even with the same 30 minutes saved each time.
How to time a changeover properly
Changeover time runs from the last good part of the old run to the first good part of the new one at full speed. The mechanical swap is only the middle of it; the search for tools before, and the adjusting, test parts and slow running after, are usually where the minutes hide. Film one changeover, list every step with its time, mark which steps could happen while the line still runs, and move those first.
Common mistakes
- Timing only the swap. Stopping the clock when the new die is in misses the run-up, the first-part approval and the slow first minutes.
- Counting money you cannot sell. If the line is not the bottleneck or demand is met, the time back is worth less overtime or smaller batches, not extra margin.
- Spending the gain without deciding. Faster changeovers can buy output or smaller batches with less stock. Both are good; pick one on purpose.
- One average for every product. A colour change and a full format change are different jobs. Time them separately.
How do you calculate the cost of a changeover?
Multiply the changeover minutes by changeovers per day and operating days a year, convert to hours, then multiply by the ideal output rate and the margin per piece. Saving 30 minutes on 4 changeovers a day over 250 days at 1,200 pieces an hour and €0.40 margin is worth €240,000 a year.
How is changeover time measured?
From the last good part of the previous run to the first good part of the next run at full speed. That includes the setup, the adjustments and the test parts, not only the mechanical swap.
What is SMED?
SMED, or Single-Minute Exchange of Die, cuts changeover to under ten minutes by moving setup steps that can be done while the line runs (external) out of the stopped time (internal), then streamlining what is left. See the full SMED and changeover-reduction guide.
Isn't every minute recoverable?
No. There is a floor set by the physical setup, and a realistic target is what matters, not zero. Pick a target you can defend (SMED aims under 10 minutes) and read the value of closing that gap.
How do we find where the time actually goes?
Break the changeover into steps and time them, then attack the biggest internal steps first. Logging every changeover stop from the machine signal, with video where cameras are fitted, makes this far faster. Fabrico tracks downtime live from PLCs, IoT sensors or AI cameras and puts the video of a stop next to its machine data. See also the OEE improvement ROI calculator for the whole gap.
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