LOOKUP Function (LibreOffice Calc)
Learn the LOOKUP function in LibreOffice Calc: Determines a value in a vector by comparison to values in another vector.
The LOOKUP function in LibreOffice Calc is used for this task: Determines a value in a vector by comparison to values in another vector. Find a matching ordered value and return the corresponding amount.
This guide explains how to read the formula, reproduce a concrete example, interpret its result and recognize common input mistakes.
Syntax and arguments
LOOKUP(search_criterion; search_vector; [result_vector])
| Argument | Required? | Meaning |
|---|---|---|
Search criterion |
Yes | The value to be used for comparison. |
Search vector |
Yes | The vector (row or column) in which to search. |
Result vector |
Optional | The vector (row or range) from which the value is to be determined. |
Calc formulas normally use semicolons (;) between arguments in common configurations; the displayed separator may depend on settings or locale.
Worked example
Use this small practice sheet for the ranges referenced in the formula:
| Row | A (Quantity) | B (Amount) | C (Category) |
|---|---|---|---|
| 1 | 1 | 10 | apple |
| 2 | 2 | 20 | pear |
| 3 | 3 | 30 | apple |
| 4 | 4 | 40 | pear |
| 5 | 5 | 50 | apple |
=LOOKUP(3;A1:A5;B1:B5)
Expected result: 30.
Why it works: Find a matching ordered value and return the corresponding amount. The specified sample table supplies the referenced cells.
How to use it in your own spreadsheet
- Identify the cells or inputs that correspond to the sample values above.
- Enter the formula in an empty cell, changing the references or literal values to match your sheet.
- Compare the output with a manual check on a small known example.
- Extend the formula to a larger dataset only after you understand the result.
Common problems and practical checks
- Use the correct lookup column or return range, and use exact-match options where appropriate.
- Check for duplicate keys, leading spaces and numbers stored as text in lookup data.
- A pasted formula may produce an error when it uses the other program’s argument separator or unsupported options.
Lookup tip: Use exact matching for product codes or identifiers unless you have deliberately sorted your data for approximate matching. Check the behavior when no match exists.
Related functions
Documentation and verification
- LibreOffice Calc Help
- The standalone example was calculated using LibreOffice Calc 25.2.3.2 on October 9, 2026 and its computed result matched the expected value. This does not certify every option, version, or other example.