Free Fishbone Diagram Template (Excel)
What a fishbone (Ishikawa) diagram is and when to use it
A fishbone (Ishikawa) diagram is a root-cause tool: you write one problem statement, then branch out possible causes under a handful of standard categories, so a team can brainstorm broadly before narrowing down to what's actually driving the issue.
It's the go-to tool for the why-is-this-happening stage of a quality investigation - before you commit to a fix, use the diagram to make sure you've considered causes across method, equipment, materials, people, measurement, and environment rather than jumping straight to the first idea in the room.
This template builds that diagram directly in native Excel cells - no drawing tools needed - so it opens, edits, and prints the same way any spreadsheet does.
How to fill in the 6M categories in this Excel template
The 6M categories - Method, Machine, Material, Manpower, Measurement, and Environment - are laid out as the six bones of the diagram, with your problem statement in the head box at the right.
Type causes directly into the cells under each bone; because it's a real spreadsheet and not an image, you can resize, reword, or add rows without redrawing anything.
The six categories - Method, Machine, Material, Manpower, Measurement, and Environment - are shared between the diagram and the Root Cause Register dropdown, so every cause you log tallies automatically under the right bone. Keeping the standard 6M set means the per-category counts in the register always match what you see on the diagram.
Using the linked root-cause register tab
Every cause you write on the diagram should also get a row in the Root Cause Register, a 60-row table where you record its category, whether it's a likely root cause, an owner, and a status (Open, Testing, Confirmed, Ruled out).
The register turns the visual brainstorm into a working list: mark a cause Likely root cause = Yes and its row highlights, and the summary tallies how many causes fall under each of the six categories plus how many are marked likely.
Working from the register instead of just the diagram makes it easy to assign follow-up and status without losing track of which of the causes on the diagram still need testing.
Printing a one-page handout for your team meeting
The diagram sheet is laid out and scaled for a single printed page, so you can hand a filled-in fishbone straight to a team meeting or attach it to a quality report without reformatting anything.
Because the register is a separate tab, you can print just the diagram for a visual discussion, or print the register alongside it as a detailed backup of every cause considered.
Keeping the diagram to one page also forces useful discipline: if you're running out of room under a bone, it's often a sign that category needs its own deeper investigation rather than more crammed text.
Fishbone vs FMEA: which root-cause tool to use
Fishbone and FMEA solve different problems: a fishbone diagram brainstorms possible causes of a problem you're already experiencing, while an FMEA scores potential failure modes before they happen, ranking them by Severity x Occurrence x Detection.
A common workflow is to run a fishbone session first to identify candidate causes, then move the confirmed root causes into an FMEA (or a corrective action tracker) to formally assess risk and assign closure.
If you're not sure which to start with, use the fishbone when you're asking why did this happen, and the FMEA when you're asking what could go wrong and how bad would it be.
How to use it
- Write the problem statement in the box at the right of the diagram.
- Add causes under each of the 6M categories directly in the diagram cells - one cause per yellow cell.
- Log every cause in the Root Cause Register, mark the likely root causes, and assign an owner and status to each.
Download the free Free Fishbone Diagram Template (Excel)
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Frequently asked questions
Can I use this fishbone template in Google Sheets?
Yes. Upload the file to Google Drive and open it with File > Save as Google Sheets. The diagram cells and register formulas keep working.
Is this a real drawing tool, or just cells?
It's built entirely from native Excel cells - merged and formatted to look like a fishbone diagram - not a drawing or diagramming add-in. That means no special software is needed, and it edits and prints like any spreadsheet.
Is it free?
Yes, in exchange for your email address. It's yours to use afterward with no further cost.
How many causes can I log in the register?
The Root Cause Register has 60 rows, which comfortably covers a typical fishbone session across all six categories.
What's the difference between a fishbone diagram and an FMEA?
A fishbone brainstorms possible causes of a problem you already have; an FMEA scores potential failure modes before they happen using Severity, Occurrence, and Detection. Many teams run a fishbone first, then feed confirmed causes into an FMEA.
What's the usage license?
Personal use or use within one business. It's not meant to be resold or redistributed as a template product.