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ACOSH function in Excel

Returns the inverse hyperbolic cosine of a number

=ACOSH(number)

ACOSH syntax and parameters

One argument, one required.

  • numbernumberRequired

    Any real number equal to or greater than 1.

ACOSH examples

Formulas you'll actually reuse.

  1. Inverse hyperbolic cosine — the input must be at least 1:

    =ACOSH(B2)

    Result1.3170

  2. ACOSH(1) is 0 — the start of the curve:

    =ACOSH(1)

    Result0

ACOSH in Google Sheets

Same name — your formula ports as-is.

Try ACOSH in the playground

Edit the example — nothing to install.

Preloaded with the ACOSH formula from Example 1 — change anything and watch it respond.

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ACOSH errors

What they mean — and the fixes.

  • #NUM!

    The number is less than 1 — ACOSH is only defined from 1 upward.

Related functions

More ways Excel gets this done.