Approximate vs exact match in Google Sheets - Compared

Introduction

When you look up data in Google Sheets, you can choose to find an exact match or an approximate match. This helps you get the right result whether you want a perfect match or the closest one.

When you want to find a product price exactly matching a product code.

When you want to find the closest grade for a test score in a grading scale.

When you want to match a name exactly in a list of employees.

When you want to find a tax rate based on income ranges using approximate match.

When you want to check if a specific date exists in a list of holidays.

Steps

Step 1: Click

- cell where you want the lookup result

The cell is selected and ready for formula input

Step 2: Type

- the selected cell

Formula input starts

💡 Start with an equal sign (=) to enter a formula

Step 3: Enter

- the formula bar or cell

Formula is typed, for example: =VLOOKUP(A2, B2:C10, 2, FALSE)

💡 Use FALSE for exact match, TRUE or omit for approximate match

Step 4: Press

- Enter key

The formula runs and shows the lookup result in the cell

Step 5: Change

- the last argument in the formula (TRUE or FALSE)

The lookup switches between approximate and exact match

Before vs After

Before

Formula =VLOOKUP(1001, A2:B10, 2) returns price for closest product code less than or equal to 1001

After

Formula =VLOOKUP(1001, A2:B10, 2, FALSE) returns price only if product code 1001 exists exactly, otherwise #N/A

Settings Reference

Range_lookup argument

📍 Last argument in VLOOKUP or HLOOKUP formula

Determines if the lookup finds an approximate match (TRUE) or exact match (FALSE)

Default: TRUE

Common Mistakes

Using approximate match (TRUE) without sorting the lookup column

Approximate match requires the lookup column to be sorted ascending to work correctly

Sort the lookup column ascending before using approximate match or use exact match (FALSE) if sorting is not possible

Omitting the last argument in VLOOKUP and expecting exact match

Omitting the last argument defaults to approximate match, which may return wrong results if data is not sorted

Always specify FALSE for exact match to avoid unexpected results

Summary

Approximate match finds the closest value less than or equal to the lookup value and needs sorted data.

Exact match finds the value exactly equal to the lookup value and returns an error if not found.

Specify TRUE for approximate match or FALSE for exact match in the last argument of lookup formulas.

Practice

1. What does the FALSE parameter in the VLOOKUP function specify?

easy

A. It sorts the data before searching.

B. It tells VLOOKUP to find an approximate match.

C. It tells VLOOKUP to find an exact match.

D. It ignores errors in the lookup.

Solution

1. Step 1: Understand the role of the last parameter in VLOOKUP

   The last parameter in VLOOKUP is the range_lookup argument, which controls match type.

2. Step 2: Interpret FALSE in range_lookup

   FALSE means VLOOKUP looks for an exact match only, no close values.

3. Final Answer:

   It tells VLOOKUP to find an exact match. -> Option C

4. Quick Check:

   FALSE = exact match [OK]

Hint: FALSE means exact match; TRUE or omit means approximate [OK]

Common Mistakes:

• Confusing FALSE with approximate match
• Thinking FALSE sorts data
• Assuming FALSE ignores errors

2. Which of these is the correct syntax for an exact match VLOOKUP in Google Sheets?

easy

A. =VLOOKUP(A2, B2:D10, 2, TRUE)

B. =VLOOKUP(A2, B2:D10, 2, FALSE)

C. =VLOOKUP(A2, B2:D10, 2)

D. =VLOOKUP(A2, B2:D10, 2, 1)

Solution

1. Step 1: Recall the exact match parameter for VLOOKUP

   Exact match requires the fourth argument to be FALSE.

2. Step 2: Check each option

   =VLOOKUP(A2, B2:D10, 2) omits the fourth argument (defaults to TRUE, approximate). =VLOOKUP(A2, B2:D10, 2, TRUE) uses TRUE (approximate). =VLOOKUP(A2, B2:D10, 2, FALSE) uses FALSE (correct exact match). =VLOOKUP(A2, B2:D10, 2, 1) uses 1 which is approximate match.

3. Final Answer:

   =VLOOKUP(A2, B2:D10, 2, FALSE) -> Option B

4. Quick Check:

   FALSE means exact match [OK]

Hint: Use FALSE as 4th argument for exact match VLOOKUP [OK]

Common Mistakes:

• Omitting the 4th argument for exact match
• Using TRUE instead of FALSE for exact match
• Using 1 instead of FALSE in Google Sheets

3. Given this sorted data in column A: 10, 20, 30, 40, 50, what will =VLOOKUP(25, A1:A5, 1, TRUE) return?

medium

A. Error

B. 25

C. 30

D. 20

Solution

1. Step 1: Understand approximate match behavior

   With TRUE (approximate), VLOOKUP finds the largest value less than or equal to the lookup value.

2. Step 2: Find largest value ≤ 25 in the list

   Values are 10, 20, 30, 40, 50. The largest value ≤ 25 is 20.

3. Final Answer:

   20 -> Option D

4. Quick Check:

   Approximate match returns closest lower value [OK]

Hint: Approximate match returns closest smaller or equal value [OK]

Common Mistakes:

• Expecting exact 25 to be found
• Choosing next higher value 30
• Thinking TRUE means exact match

4. You used =VLOOKUP(15, A1:B5, 2, TRUE) but got wrong results. The data in column A is unsorted. What is the fix?

medium

A. Sort column A ascending or use FALSE for exact match.

B. Change TRUE to 1 in the formula.

C. Remove the 4th argument entirely.

D. Use HLOOKUP instead.

Solution

1. Step 1: Identify problem with approximate match on unsorted data

   Approximate match (TRUE) requires sorted data; unsorted data causes wrong results.

2. Step 2: Fix by sorting data or using exact match

   Either sort column A ascending or use FALSE for exact match to avoid errors.

3. Final Answer:

   Sort column A ascending or use FALSE for exact match. -> Option A

4. Quick Check:

   Approximate match needs sorted data [OK]

Hint: Approximate match needs sorted data or use FALSE for exact [OK]

Common Mistakes:

• Using 1 instead of FALSE (still approximate)
• Removing 4th argument causes approximate match on unsorted data
• Switching to HLOOKUP without reason

5. You have a price table sorted by quantity: 1= $10, 5= $8, 10= $6. Which formula finds the correct price for quantity in A2 using approximate match?

hard

A. =VLOOKUP(A2, A1:B3, 2, TRUE)

B. =VLOOKUP(A2, {1,10,5,8,10,6}, 2, TRUE)

C. =VLOOKUP(A2, A1:B3, 2, FALSE)

D. =VLOOKUP(A2, A1:B3, 2)

Solution

1. Step 1: Recognize approximate match use case

   Price depends on quantity ranges, so approximate match (TRUE) finds closest lower quantity price.

2. Step 2: Check data sorting and formula correctness

   Data in A1:B3 is sorted by quantity ascending. Using TRUE for approximate match is correct. =VLOOKUP(A2, A1:B3, 2, TRUE) matches this.

3. Final Answer:

   =VLOOKUP(A2, A1:B3, 2, TRUE) -> Option A

4. Quick Check:

   Approximate match with sorted data finds correct price [OK]

Hint: Use TRUE with sorted data for range pricing lookups [OK]

Common Mistakes:

• Using FALSE causes no approximate match
• Incorrect array syntax in option A
• Omitting 4th argument defaults to TRUE but less clear