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Excel Workbook Health Check

Audit a list of formulas in one pass. See which ones are broken, which are risky, and what to fix first — before you submit the workbook or send it to a client.

Runs in your browserUpdated October 31, 2026Up to 200 formulas per audit · CSV export · Nothing uploaded

The short answer

An Excel workbook health check audits a list of formulas for syntax errors, wrong argument counts, approximate-match lookups, whole-column references, volatile functions, deep nesting and hard-coded errors. Paste one formula per line, read the prioritised report, then export the findings as a CSV — all without uploading the workbook.

Formulas to audit

One formula per line · optional labels · up to 200 formulas8 formulas on this run

Audit summary

Workbook health

This checks structure and risk patterns, not calculated values. Fix the red items first, then review the amber warnings before you submit.

Health score

94/100

Strong

Formulas

Audited in this run

With errors

Will break or be rejected

With warnings

Risky but may calculate

Clean

No structural warnings

What to fix first

Ranked by severity, then by how many formulas are affected.

Open the Error Fixer →

Syntax error

1×

The formula ends unexpectedly.

Fix: Check parentheses, commas and quotes around the location described above.

VLOOKUP is using approximate match

1×

With only three arguments, VLOOKUP defaults to approximate match (TRUE), which returns wrong values on unsorted data.

Fix: Add FALSE or 0 as the fourth argument: =VLOOKUP(A2, $D$2:$F$100, 3, FALSE).

Whole-column reference

1×

A:A forces Excel to scan more than a million rows, which can make a large workbook slow.

Fix: Use a bounded range such as A2:A5000 instead of A:A.

Volatile function: OFFSET

1×

Volatile functions recalculate whenever anything in the workbook changes, which can make large files sluggish.

Fix: If the file is slow, replace them with static values or bounded alternatives where possible.

Functions in this audit

VLOOKUP() · 1IF() · 1SUMIFS() · 1XLOOKUP() · 1IFERROR() · 1SUM() · 1OFFSET() · 1

Formula-by-formula report

Open a row to see the exact issue, the suggested fix and the references involved.

4/8 clean

1B2=VLOOKUP(A2,$D$2:$F$500,3)1 warning92/100

VLOOKUP is using approximate match

With only three arguments, VLOOKUP defaults to approximate match (TRUE), which returns wrong values on unsorted data.

Fix: Add FALSE or 0 as the fourth argument: =VLOOKUP(A2, $D$2:$F$100, 3, FALSE).

Functions: VLOOKUPReferences: A2, $D$2:$F$500

2C2=IF(B2>100,B2*0.1,0)Clean100/100

No structural problems found in this formula.

Functions: IFReferences: B2

3D2=SUMIFS($D$2:$D$500,$B$2:$B$500,H2,$C$2:$C$500,">="&I2)Clean100/100

No structural problems found in this formula.

Functions: SUMIFSReferences: $D$2:$D$500, $B$2:$B$500, H2, $C$2:$C$500, I2

4E2=XLOOKUP(A2,Employees!$A$2:$A$200,Employees!$C$2:$C$200,"Not found",0)Clean100/100

No structural problems found in this formula.

Functions: XLOOKUPReferences: A2, Employees!$A$2:$A$200, Employees!$C$2:$C$200

5F2=IFERROR(A2/B2,"")Clean100/100

No structural problems found in this formula.

Functions: IFERRORReferences: A2, B2

6G2=SUM(A:A)1 warning92/100

Whole-column reference

A:A forces Excel to scan more than a million rows, which can make a large workbook slow.

Fix: Use a bounded range such as A2:A5000 instead of A:A.

Functions: SUMReferences: A:A

7H2=OFFSET(A2,0,0,10,1)1 warning92/100

Volatile function: OFFSET

Volatile functions recalculate whenever anything in the workbook changes, which can make large files sluggish.

Fix: If the file is slow, replace them with static values or bounded alternatives where possible.

Functions: OFFSETReferences: A2

8I2=IF(A2>10,"High"1 error75/100

Syntax error

The formula ends unexpectedly.

Fix: Check parentheses, commas and quotes around the location described above.

Everything above is parsed in your browser. The formulas, labels and CSV never leave your device. The audit checks structure and risk patterns, not the calculated values in the workbook.

Read the workbook audit checklist Check assignment readiness See the 2026 Excel Error Index Deep-check one formula Explain a formula Get the workbook fixed

How to use it

1Paste one formula per line, including the leading = if you have it.
2Add optional labels such as B2: or Tax rate: before the formula so the report is easier to follow.
3Read the workbook health score and the top fixes first, then open each formula for the detailed issues.
4Export the CSV or copy the summary to keep an audit trail before you submit or share the file.

Questions about the workbook health check

What does the workbook health check test?

It runs every pasted formula through the same parser as the Formula Checker, then aggregates the results: syntax errors, wrong argument counts, approximate VLOOKUP/MATCH, whole-column ranges, volatile functions, deep nesting, hard-coded errors and constants. It also shows the functions and references used by each formula.

Is my workbook or formula data uploaded?

No. The audit runs entirely in your browser. Formulas are parsed locally and the CSV is generated on your device. Nothing is transmitted, logged or stored.

How many formulas can I audit at once?

The tool analyses up to 200 formulas per run. Paste one formula per line; optional labels such as “B2:” or “Tax rate:” are supported and appear in the exported report.

Does a clean audit mean the workbook is correct?

No. The audit checks formula structure and known risk patterns, not the values in your cells. A formula can be syntactically clean and still reference the wrong range or the wrong data type. Use it as a first pass, then test the calculated results.

Can I export the audit for an assignment or client?

Yes. Download a CSV with one row per issue, including the formula, health score, severity, explanation and suggested fix. It contains only the formulas you pasted, and it is created locally.

Need it done for you?

Audit found more than you can fix tonight?

Send the workbook, rubric and deadline. A human Excel expert repairs the formulas, tests the calculated values and returns a documented file — from $15/hr with a fixed quote.

Get a fixed quote Ask on WhatsApp See pricing →

From $15/hr
Fixed quote before work starts
Free minor revisions
Human experts, not AI files

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Keep reading

How to use it

1Paste one formula per line, including the leading = if you have it.

2Add optional labels such as B2: or Tax rate: before the formula so the report is easier to follow.

3Read the workbook health score and the top fixes first, then open each formula for the detailed issues.

4Export the CSV or copy the summary to keep an audit trail before you submit or share the file.

Questions about the workbook health check

What does the workbook health check test?

Is my workbook or formula data uploaded?

No. The audit runs entirely in your browser. Formulas are parsed locally and the CSV is generated on your device. Nothing is transmitted, logged or stored.

How many formulas can I audit at once?

The tool analyses up to 200 formulas per run. Paste one formula per line; optional labels such as “B2:” or “Tax rate:” are supported and appear in the exported report.

Does a clean audit mean the workbook is correct?

Can I export the audit for an assignment or client?

Yes. Download a CSV with one row per issue, including the formula, health score, severity, explanation and suggested fix. It contains only the formulas you pasted, and it is created locally.

Audit found more than you can fix tonight?

Send the workbook, rubric and deadline. A human Excel expert repairs the formulas, tests the calculated values and returns a documented file — from $15/hr with a fixed quote.

From $15/hr

Fixed quote before work starts

Free minor revisions

Human experts, not AI files