Collabora Office LET: Local Names and Sequential Calculations
Use local formula bindings for readable calculations, reuse intermediate results and distinguish sequential scope from workbook names. Scoped to the new Linux desktop source build.
Verification status: See the evidence and test scope described in this guide. How formula examples are checked
LET gives intermediate values names inside a formula. It can make a calculation easier to read by separating inputs, intermediate arithmetic and the final expression. Those names are local to the LET expression; they are not a request to create persistent workbook named ranges.
Syntax and naming
=LET(Name1; Name_value1; [Name2; Name_value2; ...]; Calculation)
The recommended form contains one or more name/value pairs followed by a final calculation. Names start with a letter and must satisfy Calc’s name rules without conflicting with range syntax. Use descriptive names such as unitPrice or taxAmount, rather than cell-like identifiers. The names are formula identifiers, not quoted text labels.
The evaluator processes bindings sequentially. The first value expression has no earlier LET bindings; each later value expression can use the bindings already established. Finally it evaluates the result expression with the bindings in place. This supports a chain of dependent intermediates, not a promise that a later name can be referenced before it is bound.
Step by step: quantity, price and fee
Enter A2 12, B2 5 and C2 3, representing a fictional unit price, quantity and fixed fee. The complete formula is:
=LET(baseAmount;A2*B2;feeAmount;C2;baseAmount+feeAmount)
First baseAmount becomes 12*5 = 60. Next feeAmount becomes 3. The last expression returns 63. The source-derived expectation uses those exact cell values; no spreadsheet session was run.
A literal introductory version is =LET(unitPrice;12;quantity;5;unitPrice*quantity), with expected result 60. The final argument matters: naming the two inputs does not itself specify whether to multiply, add or compare them.
Dependent bindings
=LET(subtotal;12*5;taxAmount;subtotal*0.2;subtotal+taxAmount)
The second value expression uses the earlier subtotal. Independently, subtotal is 60, tax is 12 and the final value is 72. This ordering corresponds directly to the evaluator’s passing previously bound values into each subsequent expression.
For =LET(baseAmount;100;discounted;baseAmount*0.9;discounted+5), the intermediate discounted amount is 90 and the result is 95. Keeping the final fee outside the discount makes the order of operations apparent.
Reuse and result type
=LET(sideLength;7;sideLength*sideLength) returns 49 in the independent control. The formula reuses the binding rather than spelling the original expression twice. The source evaluates each binding expression and passes its result to the following expressions; this is not a measured performance guarantee for a particular workbook.
The final result need not combine every named value. =LET(netAmount;80;taxAmount;netAmount*0.25;taxAmount) returns 20, because its final expression is the tax binding alone.
Text values are possible too:
=LET(label;"Batch";label&" "&"A")
The expected text is Batch A. Here label is an identifier while "Batch" is a text literal. Quotation marks and semicolon positions perform different jobs.
Advanced: make a calculation auditable
A useful pattern is to bind raw inputs first, then compute named stages, and finish with one clear result. For the quantity example, retaining baseAmount and feeAmount separately exposes whether a fee is per item or per order. A per-item fee of 3 would require different arithmetic from the fixed fee used here.
When revising a complex formula, compare a few independently calculated controls before and after introducing LET. Naming an incorrect expression does not correct it. Local bindings can also make it easier to return one intermediate value temporarily while checking a model, then restore the intended final expression.
Errors and limits
For the usual binding form, keep complete name/value pairs plus the final expression. The evaluator has an internal ParameterExpected path for malformed argument structures. Although it also contains a one-argument no-binding path, that is not needed for the documented naming workflow and is not recommended as a portability technique.
Invalid names, unresolved references and errors inside value expressions remain separate concerns. This guide does not promise lazy skipping of unused bindings, duplicate-name behavior, case-folding details or measured recalculation speed. LET is neither a workbook-name editor nor a guarantee of compatibility with older spreadsheet engines.
Product scope, version and evidence
This guide concerns the new Collabora Office desktop for Linux, mapped by its Flathub manifest to source build coda-26.04.4.3-1, commit 81339d176148d0d5c81ff05d82540f58f8aaa117. It uses Collabora Office 26.04 LET help and the exact evaluator source, checked October 18, 2026. The vendor’s desktop release announcement and the Linux package manifest provide product context; the latter is a mutable publication, not an installed-binary attestation.
Examples are independent calculations and source traces. No Collabora runtime or calculation engine was executed, and no native screenshot or array-entry workflow is claimed. This narrow evidence does not certify Classic, Online, CODE, mobile, Windows or macOS behavior. The original Collabora introduction release is unknown; upstream release history is not substituted for it.
The help identifies COM.MICROSOFT.LET and states that the function is outside OpenFormula 1.3. This is a format-compatibility caution, not a deprecation or retirement notice. File export, import and recalculation in another product were not tested.