Which station sets the line's rate?

The longest one. Every other station waits for it each cycle, so the bottleneck time is the line's cycle and the balance losses stack up behind it. Start any rebalance there.

How should I count a station with two operators?

Enter its cycle time as the station achieves it with the staffing you run. The page balances station times; splitting one station into two records changes the count and the idle row.

What does a negative takt gap mean?

The bottleneck is above target takt, so the line misses demand at the rate it runs now. Add capacity, move work off the bottleneck or extend available time to close the gap.

Why is efficiency below 100% on a balanced line?

Because balance is rarely perfect. Total work content almost never divides evenly across stations, so the fastest stations idle while the bottleneck repeats. The idle row prices that gap in seconds.

Production calculator

Line Balance Calculator

Measure how evenly work is spread across four stations and whether the slowest one fits inside takt. Enter each station's cycle time and the target takt.

What this calculator does

Balance efficiency and idle time across up to four stations, checked against the target takt.

Formula used

Bottleneck time = longest active station cycle
Balance efficiency = total station time ÷ (active stations × bottleneck time) × 100
Idle time per cycle = active stations × bottleneck − total station time
Takt gap = target takt − bottleneck time

Inputs explained

Station 1 Cycle: Measured cycle time at station 1, zero if unused.
Station 2 Cycle: Measured cycle time at station 2, zero if unused.
Station 3 Cycle: Measured cycle time at station 3, zero if unused.
Station 4 Cycle: Measured cycle time at station 4, zero if unused.
Target Takt: Takt the line must meet, from demand and time available.

How to use the result

Best suited to rebalancing after a kaizen, checking a line against takt, placing work from an overloaded station.
Four stations only; a longer line needs them grouped or run in two passes. It treats cycles as fixed, so variability and buffers are not modeled.

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

Which station sets the line's rate? The longest one. Every other station waits for it each cycle, so the bottleneck time is the line's cycle and the balance losses stack up behind it. Start any rebalance there.
How should I count a station with two operators? Enter its cycle time as the station achieves it with the staffing you run. The page balances station times; splitting one station into two records changes the count and the idle row.
What does a negative takt gap mean? The bottleneck is above target takt, so the line misses demand at the rate it runs now. Add capacity, move work off the bottleneck or extend available time to close the gap.
Why is efficiency below 100% on a balanced line? Because balance is rarely perfect. Total work content almost never divides evenly across stations, so the fastest stations idle while the bottleneck repeats. The idle row prices that gap in seconds.

Related guides

Line Balancing as a Weekly Operating Practice

Last reviewed 2026-10-01.