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#	docs/function-parity.md
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Brandon Thomas
2026-10-30 23:06:47 -04:00
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# Function parity: worksheet functions and formulas
> **Last reviewed:** 2026-10-31 · **Last updated:** 2026-10-31 · **Change:** minor (WEIBULL.DIST density is zero at x=0, including shape below one, as in Excel; earlier: GAMMA.DIST density at x=0 and shape 1 returns `#NUM!` as in Excel; earlier: ECMA.CEILING listed with USDOLLAR as not on Microsoft's list; earlier: IMSQRT reproduces the stray real part Excel gives for negative reals, and the other IM* differences from Excel are listed; earlier: the LAMBDA row lists the recursion limit and its `#NUM!`, and the error a defined name holding an error gives when called; earlier: number text with accounting parentheses coerces like Excel 365; INDEX with one index on a 2-D reference is #REF! as in Excel; earlier: SUBTOTAL and AGGREGATE cap the cells they visit, #2175) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
> **Last reviewed:** 2026-10-31 · **Last updated:** 2026-10-31 · **Change:** minor (BINOM.DIST and BINOM.DIST.RANGE refuse trial counts above 2,147,483,646 after truncation; earlier: WEIBULL.DIST density is zero at x=0, including shape below one, as in Excel; earlier: ECMA.CEILING listed with USDOLLAR as not on Microsoft's list; earlier: IMSQRT reproduces the stray real part Excel gives for negative reals, and the other IM* differences from Excel are listed) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
Excel's worksheet functions, category by category, against GridCraft's function library. Part of
[target-app-parity.md](target-app-parity.md); gaps feed [gaps.md](gaps.md).
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## Depth (estimated)
| Function | Excel parity note |
|---|---|
| BINOM.DIST / BINOM.DIST.RANGE | Trial count is truncated, then must be at most 2,147,483,646; larger trials return `#NUM!`. |
**~82% ready.** The library is broad and has 96 test functions in `crates/functions` with many
assertions each, but there is no conformance suite against Excel-computed results, and user
reports keep finding edge cases: MIN() with no arguments (#138), COUNTBLANK past the used range
@@ -138,6 +142,7 @@ workbooks; results checked in as data, not Excel files) and fixing what it finds
| 2026-10-31 | minor | T.INV probability zero returns `#DIV/0!`, while other out-of-range probabilities and invalid degrees remain `#NUM!`; T.INV.2T keeps its separate boundary behavior |
| 2026-10-31 | minor | GAMMA.DIST density at x=0 and shape 1 returns `#NUM!` for all positive scales; the cumulative branch and other shape boundaries are unchanged |
| 2026-10-31 | minor | WEIBULL.DIST returns zero at x=0 in both density and cumulative modes, including shape below one; negative x remains `#NUM!` |
| 2026-10-31 | minor | BINOM.DIST and BINOM.DIST.RANGE reject trial counts above 2,147,483,646 after truncation |
| 2026-10-27 | minor | ECMA.CEILING added to the functions that are in our library but not on Microsoft's list (with USDOLLAR), so the counts don't change |
| 2026-10-26 | minor | IMSQRT uses Excel's polar route with its cosine reduction, so `IMSQRT("-4")` is `1.22514845490862E-16+2i` as in Excel (exact `2i` before); the rows list the IM* differences still open |
| 2026-10-25 | minor | LAMBDA row: a LAMBDA that calls itself more than 140 times, and a formula nested past the depth limit, give `#NUM!` (#1809; nesting gave `#CALC!` before). `=Foo(1)` where the defined name Foo holds `#N/A` gives `#N/A`, not `#NAME?` |