Takt Time
Takt time is the interval at which a finished unit must leave the line to meet customer demand, found by dividing net available production time by the number of units customers require in that time. It is set by demand, never by how fast a machine can run.
Takt comes from the German word for a beat or a measure, and it means exactly that: the beat the process has to keep. Divide the net time available for production in a period by the number of units the customer wants in that period, and the answer is how often a finished unit has to come off the line. Net means time genuinely available for work, so scheduled breaks, planned maintenance and shift meetings come out, while unplanned breakdowns and rework stay in, because those are losses to be eliminated rather than capacity to be conceded.
The number is set entirely by demand. A machine capable of a part every twenty seconds does not make takt twenty seconds. If customers need one unit every ninety seconds, takt is ninety seconds, and running faster only builds inventory nobody ordered. This inversion is what people find hardest. Takt is a requirement handed to the process from outside, and the process is then balanced to meet it, which usually means moving work content between stations rather than asking anyone to work faster.
Cycle time is what the process actually achieves: the interval between completed units as it currently runs. Takt is what it must achieve. If cycle time sits below takt there is slack, and if it sits above takt the line cannot meet demand however well it is managed, so the gap between the two is the improvement list. Lead time is different again, the elapsed time from a customer's order to delivery, which includes queue, batching and shipping and is usually far longer than either. A line can hold takt perfectly and still quote a six-week lead time.
In practice takt becomes the yardstick for line balancing. Work content is divided among stations so that no station's cycle time exceeds takt, and the station that does becomes the bottleneck setting real output. Shops post takt at the line and track actual output against it hour by hour, which turns a miss into something visible within the hour instead of at the end of the shift.
Two mistakes recur. The first is computing takt from gross shift time, which produces a beat the line can never hold once breaks are taken. The second is recalculating takt every time a week of orders moves, which destabilizes the balance; most shops set takt from a demand rate over a month or a quarter and revisit it on a planned cadence. Takt also fits poorly where volume is low and every job differs, because a shop with no repeating unit has no meaningful beat to keep.
Takt Time = Net Available Production Time / Customer Demand for that period, where net available time excludes scheduled breaks, planned maintenance and meetings but not unplanned downtime.
An assembly line runs two 8-hour shifts, five days a week. Each shift loses 30 minutes of breaks and 10 minutes of startup checks, leaving 440 working minutes, so a day provides 880 minutes. Demand is 4,400 units a month across 20 working days, or 220 units a day. Takt time is 880 divided by 220, or 4 minutes per unit. The line currently completes a unit every 4 minutes 30 seconds, so its cycle time runs 12.5 percent above takt and the longest station has to be rebalanced.
What is the difference between takt time and cycle time?
Takt time is the rate the process must hit to satisfy demand, and cycle time is the rate it currently hits. Takt is calculated from customer orders and available time; cycle time is measured on the floor. Cycle time below takt means spare capacity, and cycle time above takt means the line cannot meet demand as it stands.
How do I calculate takt time for my line?
Take the production time genuinely available in a period, subtracting breaks, planned maintenance and meetings, then divide by the units the customer needs in that same period. Use the same period for both figures. Do not subtract unplanned downtime or scrap losses, because building those into takt bakes today's problems into tomorrow's target.
What happens if cycle time is longer than takt time?
The line cannot meet demand and the shortfall compounds every shift. Options are to rebalance work away from the slowest station, shorten that station's work content through better tooling or fixturing, add a parallel station, or add available time with overtime or another shift. Running the existing stations faster is rarely the answer.
What is the difference between takt time and lead time?
Takt time is a production rate measured in minutes or seconds per unit. Lead time is an elapsed duration from order to delivery, measured in days or weeks, and it includes order processing, material procurement, queue, batching and shipping. Holding takt tells you the line keeps up with demand; it says nothing about how long a customer waits.
How often should takt time be recalculated?
On a planned cadence rather than continuously, typically monthly or quarterly, using a demand rate rather than a single week's orders. Recalculating on every demand wobble forces constant rebalancing and destabilizes the line. Recalculate immediately when demand shifts structurally, such as a new program starting or a major customer changing volume.