In this article
LOGNORMDIST returns the cumulative lognormal probability. It is a compatibility function: Excel keeps it so workbooks from Excel 2007 and earlier still calculate, but Microsoft recommends LOGNORM.DIST for new work. Both give the same result.
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Syntax
=LOGNORMDIST(x, mean, standard_dev)| Argument | What it means |
|---|---|
x |
Value |
mean, standard_dev |
Of ln(x) |
Examples
Example 1
=ROUND(LOGNORMDIST(A2,B2,C2),4)Result: 0.637. See the worked example table below for more cases.
💡 For new workbooks use LOGNORM.DIST: it gives the same answer and is the name Microsoft keeps documenting.
LOGNORMDIST in practice
Where you will use it
- Opening and checking older workbooks that use LOGNORMDIST
- Understanding formulas shared by colleagues on older Excel versions
- Knowing when to swap in LOGNORM.DIST for clarity
Worked example
| x | Mean ln | SD ln | Formula | Result |
|---|---|---|---|---|
| 100 | 4.5 | 0.3 | =ROUND(LOGNORMDIST(A2,B2,C2),4) | 0.637 |
| 150 | 4.5 | 0.3 | =ROUND(LOGNORMDIST(A3,B3,C3),4) | 0.9556 |
| 50 | 4 | 0.5 | =ROUND(LOGNORMDIST(A4,B4,C4),4) | 0.4302 |
Results calculated in Excel. Same result as LOGNORM.DIST.
Mistakes people make
| Mistake | What to do instead |
|---|---|
| Using LOGNORMDIST in new files | Prefer LOGNORM.DIST: same result, clearer name, and the function Microsoft keeps improving |
| Mixing old and new names in one model | Pick one style per workbook so formulas are easy to audit |
Related functions
📚 Part of the free Excel course: Beginner → Expert · Try it in the Formula Lab or ask the AI Helper.
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