Line Balancing Calculator
The minimum number of workstations an assembly line needs to hit a takt time, the balance efficiency of a given station count, and where the idle time sits.
Total task time divided by takt time gives the theoretical minimum stations, rounded up.
How the line balancing calculator works
Total task time divided by takt time gives the theoretical minimum stations, rounded up. Real lines need more, because tasks do not divide evenly, and the efficiency — task time over stations times cycle time — says how much of the line is idle.
Eighty-five per cent balance is good; below seventy, a station is waiting most of the time and the line is over-staffed for its output.
Formula: min stations = ceil(Σ task time / takt); efficiency = Σ task time / (stations × cycle time)
Worked examples
| Inputs | Minimum workstations | Note |
|---|---|---|
| Eight tasks, 400 a shift | 5 | five stations minimum |
| Higher demand | 7 | a shorter takt, more stations |
| A task too long | 10 | the 60 s task exceeds the takt |
FAQFrequently asked questions
What is line balancing?
Distributing tasks across workstations so each takes about the same time and none exceeds the takt. It sets how many people a line needs.
What is takt time?
Available time divided by demand — the rhythm the line must produce at. It is set by the customer, not the process.
What balance efficiency is good?
Above 85% is well balanced. Below 70% there is a station idle most of the cycle, which usually means one fewer station would do.
What if a task is longer than the takt?
The line cannot meet demand at that station. Split the task, add a parallel station, or reduce the task time.
Why does the minimum station count round up?
Because tasks are indivisible and do not pack perfectly. The real count is usually one or two above the theoretical minimum.
Where these figures come from
- Nakajima (1988) — Introduction to TPM — the origin of Overall Equipment Effectiveness and its six big losses
- Health and Safety Executive — the UK workplace safety regulator
Last checked: September 2026. Definitions follow standard operations-management practice; where plants commonly differ, the page says so.