.jar and .dex method count helpers for Windows. dx from build-tools in the Android SDK has to be in your PATH. Just call methodcount.bat "filename"

methodcount.bat

@ECHO OFF
IF "%1"=="" GOTO MissingFileNameError
IF EXIST "%1" (GOTO ContinueProcessing) ELSE (GOTO FileDoesntExist)

:ContinueProcessing
set FileNameToProcess=%1
set FileNameForDx=%~n1.dex
IF "%~x1"==".dex" GOTO ProcessWithPowerShell

REM preprocess Jar with dx
IF "%~x1"==".jar" (
	ECHO Processing Jar %FileNameToProcess% with DX!
	CALL dx --dex --output=%FileNameForDx% %FileNameToProcess%
	set FileNameToProcess=%FileNameForDx%
	IF ERRORLEVEL 1 GOTO DxProcessingError
)

:ProcessWithPowerShell
ECHO Counting methods in DEX file %FileNameToProcess%
CALL powershell -noexit -executionpolicy bypass "& ".\printhex.ps1" %FileNameToProcess%
GOTO End

:MissingFileNameError
@ECHO Missing filename for processing
GOTO End

:DxProcessingError
@ECHO Error processing file %1% with dx!
GOTO End

:FileDoesntExist
@ECHO File %1% doesn't exist!
GOTO End

:End

printhex.ps1

<#
.SYNOPSIS
Outputs the number of methods in a dex file.

.PARAMETER Path
Specifies the path to a file. Wildcards are not permitted.

#>
param(
  [parameter(Position=0,Mandatory=$TRUE)]
    [String] $Path
)

if ( -not (test-path -literalpath $Path) ) {
  write-error "Path '$Path' not found." -category ObjectNotFound
  exit
}

$item = get-item -literalpath $Path -force
if ( -not ($? -and ($item -is [System.IO.FileInfo])) ) {
  write-error "'$Path' is not a file in the file system." -category InvalidType
  exit
}

if ( $item.Length -gt [UInt32]::MaxValue ) {
  write-error "'$Path' is too large." -category OpenError
  exit
}

$stream = [System.IO.File]::OpenRead($item.FullName)
$buffer = new-object Byte[] 2
$stream.Position = 88
$bytesread = $stream.Read($buffer, 0, 2)
$output = $buffer[0..1] 
#("{1:X2} {0:X2}") -f $output
$outputdec = $buffer[1]*256 + $buffer[0]
"Number of methods is " + $outputdec
$stream.Close() 

I have set dx.bat file path on PATH variable but still i am getting "dx' is not recognize as internal or external command".

use the suggested batch-name methodcount.bat