Do changeovers go in scheduled breaks or in uptime?

In uptime. OEE counts a changeover as a planned stop inside planned production time, so your uptime record already carries it. Scheduled breaks holds only time the line is not meant to run, such as breaks, meals and meetings.

What cycle time do I enter for a two-up fixture?

Enter seconds per unit: the fixture cycle divided by the units it completes. A 36-second cycle that makes two parts is 18 seconds per unit.

Does a reworked unit count toward first-pass yield?

No. First-pass yield counts only units that pass the first time. A unit repaired later still used a line cycle this shift, so it counts as a reject here.

Should I book overtime or chase uptime?

Check uptime needed first. If your better shifts already reach it, fixing the top downtime cause can close the gap without paid hours. If it is above your best shifts or above 100%, book the overtime.

Conveyors calculator

Shift Capacity Calculator

Find the good units a shift will make before you commit it to the schedule, and the overtime or uptime a short target needs. You need shift length, breaks, bottleneck cycle, measured uptime and yield.

What this calculator does

Good units one shift makes from cycle time, breaks, uptime and first-pass yield, checked against the shift target.

Formula used

Planned production time = shift length − scheduled breaks
Gross shift capacity = planned production time × 60 ÷ bottleneck cycle time
Good shift capacity = gross × uptime % ÷ 100 × first-pass yield % ÷ 100
Uptime needed = shift target ÷ (gross × yield % ÷ 100) × 100
Overtime = MAX(0, target − good) ÷ (60 ÷ cycle time × uptime % ÷ 100 × yield % ÷ 100)

Inputs explained

Shift Length: Minutes from shift start to shift end, breaks included.
Scheduled Breaks: Breaks, meals and meetings when the line is not meant to run.
Bottleneck Cycle Time: Seconds per unit while running: run time ÷ total count.
Uptime: Run time ÷ planned production time from downtime logs, changeovers included.
First-Pass Yield: Units good the first time ÷ total count, from inspection records.
Shift Target: Good units the schedule asks this shift to make.

How to use the result

Best suited to committing a shift quantity at the start-up meeting, deciding how much overtime a short shift needs.
Uses average uptime and yield; a long breakdown or a quality hold on one shift is not predicted. Assumes the bottleneck is never starved or blocked beyond what the uptime record already shows.

Current U.S. benchmarks

The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

Do changeovers go in scheduled breaks or in uptime? In uptime. OEE counts a changeover as a planned stop inside planned production time, so your uptime record already carries it. Scheduled breaks holds only time the line is not meant to run, such as breaks, meals and meetings.
What cycle time do I enter for a two-up fixture? Enter seconds per unit: the fixture cycle divided by the units it completes. A 36-second cycle that makes two parts is 18 seconds per unit.
Does a reworked unit count toward first-pass yield? No. First-pass yield counts only units that pass the first time. A unit repaired later still used a line cycle this shift, so it counts as a reject here.
Should I book overtime or chase uptime? Check uptime needed first. If your better shifts already reach it, fixing the top downtime cause can close the gap without paid hours. If it is above your best shifts or above 100%, book the overtime.

Last reviewed 2026-10-01.