How to use the takt time and line balance calculator
- Enter the available production time per shift in minutes and the units that must be made in it.
- List each task and its time in seconds for one unit, separated by a comma.
- Read the takt time, the total task time, the theoretical minimum number of stations and the layout the page found.
- Check any task flagged as longer than the takt time, then copy the table or download the CSV.
Formula
takt time = available time in seconds / units needed
theoretical minimum stations = ceil(total task time / takt time)
line efficiency = total task time / (stations x takt time)
layout: tasks longest first, each into the first station with room
The minimum is a lower bound: no layout can use fewer stations. Packing tasks into stations is a hard puzzle in general, so the layout found may use more stations than the best possible.
Eight tasks, 300 units in 450 minutes
The available time is 450 x 60 = 27,000 seconds, and 300 units are needed, so the takt time is 90 seconds. The eight tasks take 18 + 52 + 35 + 41 + 28 + 24 + 12 + 30 = 240 seconds per unit. At least ceil(240 / 90) = 3 stations are needed, and the best possible efficiency is 240 / 270 = 88.9%.
The first fit layout starts with the 52 second task and adds the 35 second one to reach 87 seconds, puts 41, 30 and 18 together for 89 seconds, and leaves 28, 24 and 12 for 64 seconds. Three stations are enough, matching the lower bound, with an efficiency of 88.9%.
What takt time tells you
Takt time is the pace at which a unit must be completed to meet demand. If the work content per unit is longer than the takt time, one person cannot do it all and the work has to be split across stations or run in parallel. A task that takes longer than the takt time on its own cannot fit in any station, and the page flags it.
Takt time is not the same as cycle time. Cycle time is how long a station actually takes, and the line can only keep pace when every station’s cycle time is at or below the takt time.
Limits of the layout
The layout treats tasks as independent, so it ignores the order in which work has to happen, tool changes and walking time. Real line balancing has to respect precedence, which usually raises the number of stations above the lower bound.
Treat the theoretical minimum as a floor and the layout as a starting example. Measure real output with the OEE Calculator, and estimate an uncertain task time with the Three Point Estimate Calculator.
Assumptions and limits
- Available time is the production time per shift after breaks and planned stops, up to 1,440 minutes.
- Tasks can be assigned to any station in any order. Precedence is not modeled.
- Up to 100 tasks are read, each with a time above zero.
- Times are the same for every unit and every operator.
- Nothing typed here leaves your browser.
Frequently asked questions
Why can the layout use more stations than the minimum?
Tasks cannot be split, so gaps are left in stations that no remaining task fits into. The minimum assumes work could be divided perfectly, which real tasks usually cannot.
What does efficiency mean here?
It is the share of the stations’ available time that is filled with work. The rest is idle time. A line with 88.9% efficiency has about 11 percent idle time across its stations.
What if demand changes?
Change the units needed and the takt time changes in proportion. Higher demand shortens the takt time and raises the number of stations needed.
Should I round the takt time?
The page keeps its exact value for the arithmetic and shows two decimals. Round down in practice if you want a small buffer so that the line runs slightly faster than demand.