[#wallet-CalculateMaximumSignedInputSize-0c]
= xref:wallet.adoc[wallet]::CalculateMaximumSignedInputSize
:relfileprefix: ../
:mrdocs:

Get the marginal bytes if spending the specified output from this transaction. Use CoinControl to determine whether to expect signature grinding when calculating the size of the input spend.

== Synopsis

Declared in `<wallet/spend.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CalculateMaximumSignedInputSize(
    xref:CTxOut.adoc[CTxOut] const& txout,
    xref:wallet/CWallet.adoc[CWallet] const* pwallet,
    xref:wallet/CCoinControl.adoc[CCoinControl] const* coin_control);
----

== Return Value

The marginal size in bytes of the signed input, or ‐1 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *txout*
| The output that would be spent.
| *pwallet*
| The wallet that owns the output and provides signing information.
| *coin_control*
| Coin control settings used to decide whether to expect signature grinding.
|===


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