Should I use minutes or hours for the annual saving?

Minutes for one shift, hours for a year: at 250 production days, one minute saved at four changeovers per shift returns 16.7 hours a year. Annual hours compare directly with overtime or added capacity.

What counts as the improved changeover time?

The time after the improvement is proven on production runs. Measure it from the last good part of the old run to the first good part of the new one, with adjustments and trial pieces inside that window.

Where do saved changeover minutes go?

Either into more production if the work center is the constraint, or into smaller batches and shorter lead times if it is not. Decide which before you price the saving.

Does a low current time mean there is nothing left to save?

Not necessarily. The reduction percentage matters too: 5 minutes off a 15-minute changeover is a third of the setup, and high-frequency lines still bank large annual hours.

Lean Manufacturing & Operations calculator

SMED Time Savings Calculator

Size the capacity a shorter changeover returns to the shift and to the year. You need the current and improved changeover times, changeovers per shift and production days.

What this calculator does

Time recovered per shift and per year from a changeover reduction, with the percentage cut.

Formula used

Reduction per changeover = current changeover time − improved changeover time
Time saved per shift = reduction per changeover × changeovers per shift
Current total = current time × changeovers; improved total = improved time × changeovers
Time saved per year (hr) = time saved per shift × production days ÷ 60
Changeover reduction = reduction ÷ current changeover time × 100

Inputs explained

Current Changeover Time: Today's setup time, from the last piece to the first good piece.
Improved Changeover Time: The setup time the SMED work has demonstrated on runs.
Changeovers per Shift: Setups the shift actually performs, from the production record.
Production Days per Year: Plant calendar for this line, counted the same way each year.

How to use the result

Best suited to sizing a SMED event's gain, comparing changeover projects, building a capacity case for setup work.
Excludes the one-time cost of the SMED work: fixtures, training and trial runs. Saved minutes add output only when the work center has demand waiting for it.

Current U.S. benchmarks

U.S. manufacturing runs at 75.7% of capacity (Federal Reserve, Aug 2026). New factory orders are up 8.5% year over year (Census).

Common questions

Should I use minutes or hours for the annual saving? Minutes for one shift, hours for a year: at 250 production days, one minute saved at four changeovers per shift returns 16.7 hours a year. Annual hours compare directly with overtime or added capacity.
What counts as the improved changeover time? The time after the improvement is proven on production runs. Measure it from the last good part of the old run to the first good part of the new one, with adjustments and trial pieces inside that window.
Where do saved changeover minutes go? Either into more production if the work center is the constraint, or into smaller batches and shorter lead times if it is not. Decide which before you price the saving.
Does a low current time mean there is nothing left to save? Not necessarily. The reduction percentage matters too: 5 minutes off a 15-minute changeover is a third of the setup, and high-frequency lines still bank large annual hours.

Last reviewed 2026-10-01.