IFERROR and IFNA in Google Sheets - Dashboard Guide

Dashboard Mode - IFERROR and IFNA

Goal

Find total sales per product and handle errors gracefully when data is missing or incorrect.

Sample Data

Product	Sales Q1	Sales Q2	Sales Q3
Apples	100	150	200
Bananas	80	#N/A	120
Cherries	50	70	#ERROR!
Dates	#N/A	60	90
Elderberries	40	50	60

Dashboard Components

• Total Sales with IFERROR: Calculates total sales per product ignoring errors or missing data.
  Formula example for Apples (row 2): =IFERROR(B2+C2+D2, 0)
• Total Sales with IFNA: Calculates total sales per product but only handles #N/A errors.
  Formula example for Bananas (row 3): =IFNA(B3+C3+D3, 0)
• Summary Table: Shows product names and total sales calculated with IFERROR.
  Formula in E2: =IFERROR(B2+C2+D2, 0) and drag down.
• Error Check Column: Identifies if there is an error in sales data.
  Formula in F2: =IF(ISERROR(B2+C2+D2), "Error Found", "No Error")

Dashboard Layout

+----------------------+----------------------+----------------------+
|      Sample Data     |  Total Sales (IFERROR) | Total Sales (IFNA)   |
|  (Table with products)|  (KPI cards/table)   |  (KPI cards/table)   |
+----------------------+----------------------+----------------------+
| Error Check Column   |                      |                      |
+----------------------+----------------------+----------------------+ 

Interactivity

Add a filter to select a product name. When you pick a product, the total sales with IFERROR and IFNA update to show only that product's data. The error check column also updates to show if that product has errors.

Self Check

If you filter to show only "Bananas", which have a missing value (#N/A) in Q2, what will the total sales show using IFERROR and IFNA formulas? Which error check message appears?

Key Result

Dashboard shows total sales per product handling errors with IFERROR and IFNA formulas.

Practice

1. What does the IFERROR function do in Google Sheets?

easy

A. It highlights cells that contain errors.

B. It only replaces #N/A errors with a custom value.

C. It counts the number of errors in a range.

D. It replaces any error in a formula with a custom value you choose.

Solution

1. Step 1: Understand the purpose of IFERROR

   The IFERROR function checks if a formula results in any error, such as #DIV/0!, #VALUE!, or #N/A.

2. Step 2: Know what IFERROR does with errors

   When an error is found, IFERROR replaces it with a value you specify, keeping your sheet clean and readable.

3. Final Answer:

   It replaces any error in a formula with a custom value you choose. -> Option D

4. Quick Check:

   IFERROR replaces all errors, not just #N/A [OK]

Hint: IFERROR handles all errors, IFNA only #N/A errors [OK]

Common Mistakes:

• Confusing IFERROR with IFNA
• Thinking IFERROR counts errors
• Assuming IFERROR highlights errors

2. Which of the following is the correct syntax for using IFNA in Google Sheets?

easy

A. =IFNA(value, value_if_na)

B. =IFNA(value, value_if_false)

C. =IFNA(value, value_if_blank)

D. =IFNA(value, value_if_error)

Solution

1. Step 1: Recall IFNA syntax

   The IFNA function syntax is =IFNA(value, value_if_na), where it returns value unless it is #N/A, then it returns value_if_na.

2. Step 2: Match the correct parameter name

   The second parameter must be the value to return if the error is specifically #N/A, so value_if_na is correct.

3. Final Answer:

   =IFNA(value, value_if_na) -> Option A

4. Quick Check:

   IFNA syntax uses value_if_na for #N/A errors [OK]

Hint: IFNA replaces only #N/A errors, syntax uses value_if_na [OK]

Common Mistakes:

• Using value_if_error instead of value_if_na
• Confusing IFNA with IFERROR syntax
• Using wrong parameter names

3. Given the formula =IFERROR(A1/B1, "Error") where A1=10 and B1=0, what will be the result?

medium

A. 0

B. #DIV/0!

C. "Error"

D. 10

Solution

1. Step 1: Calculate the division A1/B1

   Since B1 is 0, dividing 10 by 0 causes a #DIV/0! error.

2. Step 2: Apply IFERROR to handle the error

   IFERROR detects the error and returns the custom text "Error" instead of the error message.

3. Final Answer:

   "Error" -> Option C

4. Quick Check:

   Division by zero triggers IFERROR to return "Error" [OK]

Hint: IFERROR returns custom value on any error like division by zero [OK]

Common Mistakes:

• Expecting #DIV/0! to show instead of custom text
• Confusing IFERROR with IFNA behavior
• Thinking result is 0 or 10

4. You have the formula =IFNA(VLOOKUP("Apple", A2:B5, 2, FALSE), "Not found") but it always returns "Not found" even when "Apple" is in the list. What is the likely problem?

medium

A. IFNA syntax is wrong; it should be IFERROR.

B. The VLOOKUP range is incorrect or missing the lookup value.

C. The formula should use TRUE for approximate match instead of FALSE.

D. The lookup value "Apple" is misspelled in the formula.

Solution

1. Step 1: Check the VLOOKUP range and lookup value

   If "Apple" is in the list but still returns "Not found", the range A2:B5 might not include the cell containing "Apple" or the lookup value is not exactly matching.

2. Step 2: Understand IFNA behavior

   IFNA only replaces #N/A errors, so if VLOOKUP can't find "Apple" in the specified range, it returns #N/A, triggering IFNA to show "Not found".

3. Final Answer:

   The VLOOKUP range is incorrect or missing the lookup value. -> Option B

4. Quick Check:

   Incorrect range causes #N/A triggering IFNA [OK]

Hint: Check VLOOKUP range includes lookup value to avoid #N/A [OK]

Common Mistakes:

• Using IFERROR instead of IFNA incorrectly
• Using approximate match (TRUE) when exact needed
• Misspelling lookup value in formula

5. You want to create a formula that divides A1 by B1, but if B1 is zero or empty, it should show "Invalid". Also, if the division results in #N/A, it should show "Missing data". Which formula correctly does this?

hard

A. =IF(B1=0, "Invalid", IFNA(A1/B1, "Missing data"))

B. =IFNA(IF(B1=0, "Invalid", A1/B1), "Missing data")

C. =IFERROR(IF(B1=0, "Invalid", A1/B1), "Missing data")

D. =IF(B1=0, "Invalid", IFERROR(A1/B1, "Missing data"))

Solution

1. Step 1: Handle zero or empty divisor first

   Use IF(B1=0, "Invalid", ...) to check if B1 is zero or empty and return "Invalid" immediately.

2. Step 2: Use IFNA to catch #N/A errors in division

   Wrap the division A1/B1 inside IFNA(..., "Missing data") to replace only #N/A errors with "Missing data".

3. Step 3: Combine both checks correctly

   The formula =IF(B1=0, "Invalid", IFNA(A1/B1, "Missing data")) first checks divisor, then handles #N/A errors properly.

4. Final Answer:

   =IF(B1=0, "Invalid", IFNA(A1/B1, "Missing data")) -> Option A

5. Quick Check:

   Check zero first, then IFNA for #N/A errors [OK]

Hint: Check zero divisor first, then use IFNA for #N/A errors [OK]

Common Mistakes:

• Using IFERROR instead of IFNA for #N/A errors
• Not checking zero divisor before division
• Swapping IFNA and IFERROR order incorrectly