How do you calculate Yamazumi station time?

Add the value-adding, incidental, and waste time observed at the station. With 30 seconds value-adding, 12 seconds incidental, and 8 seconds waste, the total station time is 30 + 12 + 8 = 50 seconds.

What is the difference between incidental work and waste?

Incidental work is necessary but non-value-adding, like fixturing or reaching for a tool; waste is pure non-value, like searching, waiting, or rework. Both are reduction targets, but waste is eliminated first.

What is a good Yamazumi balance?

A good chart shows every station's total close to but under takt, with a high value-adding share. If takt is 60 seconds and your station totals 50, you have 10 seconds of margin and room to absorb work from an overloaded neighbor.

What does a Yamazumi chart show that a number cannot?

It shows the per-station stacks side by side against a takt line, so imbalance and waste pockets jump out visually. The 50-second total is one bar; the chart is the whole line, which is where rebalancing decisions get made.

Yamazumi chart vs line balancing efficiency?

The Yamazumi chart is the visual; balancing efficiency is the metric derived from it, typically the sum of value-add divided by (number of stations times takt). The chart shows where to move work to raise that efficiency.

How do you use Yamazumi for kaizen?

Eliminate the waste segment first, then shift value-adding and incidental work between stations until every stack sits just under takt. The goal is fewer, fuller stations rather than many half-loaded ones.

Lean Manufacturing & Operations calculator

Yamazumi Chart Balance Calculator

Yamazumi balance is the total cycle time at a workstation, broken into value-adding, incidental (necessary but non-value-adding), and outright waste time. Named for the Japanese 'to stack up,' a Yamazumi chart stacks these segments per station so a balancing team can see at a glance where work is uneven and where waste hides. Lean facilitators and line leaders use it during kaizen events to redistribute work toward takt and to make the value-to-waste ratio visible. It turns a vague feeling that 'station 3 is slow' into a stacked bar everyone can act on.

What this calculator does

Sum value-adding work, incidental work, and waste time for one station to build a yamazumi (stacked bar) analysis showing how operator time is spent.
Use this calculator when constructing yamazumi charts to visualize value-adding vs. non-value-adding time at each workstation and identify waste reduction targets.
It sums the three work categories at a station, value-adding, incidental, and waste, into one total station cycle time.

Formula used

Total Station Time = Value-Adding + Incidental + Waste

Inputs explained

Value-adding work time:
Incidental work time:
Waste time:

How to use the result

Use it when building a Yamazumi chart for line balancing, running a kaizen to rebalance stations, or quantifying how much of a cycle is genuine value-add.
The total alone does not tell you whether the station fits takt or how to redistribute; you must compare each station's stack against takt and against neighboring stations.

Current U.S. benchmarks

U.S. manufacturing runs at 75.6% of capacity (Federal Reserve, May 2026). New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate Yamazumi station time? Add the value-adding, incidental, and waste time observed at the station. With 30 seconds value-adding, 12 seconds incidental, and 8 seconds waste, the total station time is 30 + 12 + 8 = 50 seconds.
What is the difference between incidental work and waste? Incidental work is necessary but non-value-adding, like fixturing or reaching for a tool; waste is pure non-value, like searching, waiting, or rework. Both are reduction targets, but waste is eliminated first.
What is a good Yamazumi balance? A good chart shows every station's total close to but under takt, with a high value-adding share. If takt is 60 seconds and your station totals 50, you have 10 seconds of margin and room to absorb work from an overloaded neighbor.
What does a Yamazumi chart show that a number cannot? It shows the per-station stacks side by side against a takt line, so imbalance and waste pockets jump out visually. The 50-second total is one bar; the chart is the whole line, which is where rebalancing decisions get made.
Yamazumi chart vs line balancing efficiency? The Yamazumi chart is the visual; balancing efficiency is the metric derived from it, typically the sum of value-add divided by (number of stations times takt). The chart shows where to move work to raise that efficiency.

Last reviewed 2026-05-12.