Hi, @Vnk
You can go through this regarding DAX calculation on KB and GB:
Total Used Space =
VAR total =
    SUM ( Table1[Used Space] ) + 0
RETURN
    IF (
        total < 1024,
        FORMAT ( total, "#0.0# B" ),
        IF (
            total < POWER ( 2, 20 ),
            FORMAT ( total / POWER ( 2, 10 ), "#0.0# KB" ),
            IF (
                total < POWER ( 2, 30 ),
                FORMAT ( total / POWER ( 2, 20 ), "#0.0# MB" ),
                FORMAT ( total / POWER ( 2, 30 ), "#0.0# GB" )
            )
        )
    )
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