What is a spaghetti diagram?

A spaghetti diagram is a simple map of the physical path a person or product travels through a workspace, drawn as one continuous line on a floor plan. The tangled, noodle-like result makes wasted motion and transport visible at a glance, so you can redesign the layout to shorten the path.

What waste does it reveal?

Chiefly motion (people walking) and transport (moving materials) — two of the seven wastes. Long or crossing lines mean the layout is forcing travel that adds no value. The work at each station is unchanged; only the distance between them is the target.

How do you measure the distance?

Trace the path to scale on a floor plan and total the segment lengths, or walk it with a pedometer. Then multiply by the daily volume — a modest per-cycle distance becomes kilometres per shift, which is what makes the case for change.

How do you fix a bad one?

Rearrange the stations so steps that happen in sequence sit next to each other — often a U-shaped cell where material enters and finished parts leave at the same end. Re-draw the diagram after each change to confirm the path actually shrank.

● Interactive Guide

The Spaghetti Diagram

Trace the path a worker actually walks, and the waste jumps off the page. Below is one shift in a fabrication cell — walk it, then drag the machines to untangle it.

By Matt Savas · Kaizumi · interactive

Every step between stations is motion — necessary movement, but not value. A spaghetti diagram makes it impossible to ignore.

The move · interactive

Walk it, then untangle it

A spaghetti diagram traces the path someone actually walks. Pick a setting, press “Walk it,” then drag the stations into a sensible flow and watch the distance fall — same work, far less walking. The waste isn’t only on factory floors.

drag any machine to move it

Walking distance / part

0 m

≈ 0 km per shift

vs the starting layout

—

redesign the layout to cut it

The line through the machines is the operator’s path for one part. Press Walk the shift to trace it.

The work at each machine doesn’t change — only the walking between them. That walking is pure motion waste, and layout is the only thing that fixes it.

On your own floor

How to run one for real

Pick one subject

One operator, or one part. Don’t mix — a diagram that tracks everything tracks nothing.

Stand and follow

Watch a full cycle at the gemba and draw every move as one continuous line on a floor plan.

Measure it

Total the distance (a pedometer or map scale works). Multiply by the day’s volume — the number shocks people.

Redesign the flow

Move the stations so consecutive steps are adjacent — usually a U-shaped cell. Re-draw, re-measure, repeat.

The classic version is a pen line on a floor-plan sketch — one continuous, tangled trace.

Good to know

Frequently asked

What is a spaghetti diagram?: A spaghetti diagram is a simple map of the physical path a person or product travels through a workspace, drawn as one continuous line on a floor plan. The tangled, noodle-like result makes wasted motion and transport visible at a glance, so you can redesign the layout to shorten the path.
What waste does it reveal?: Chiefly motion (people walking) and transport (moving materials) — two of the seven wastes. Long or crossing lines mean the layout is forcing travel that adds no value. The work at each station is unchanged; only the distance between them is the target.
How do you measure the distance?: Trace the path to scale on a floor plan and total the segment lengths, or walk it with a pedometer. Then multiply by the daily volume — a modest per-cycle distance becomes kilometres per shift, which is what makes the case for change.
How do you fix a bad one?: Rearrange the stations so steps that happen in sequence sit next to each other — often a U-shaped cell where material enters and finished parts leave at the same end. Re-draw the diagram after each change to confirm the path actually shrank.

5S →Value stream mapping →Work-element analysis →Gemba walk →Muda: the seven wastes

Matthew Savas

Founder of Kaizumi, an AI-powered Lean training platform. More about Matthew →

Updated July 2026 · The floor layouts, figures, and distances are illustrative, created for teaching.