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How do I convert dBm to dBmV since power meter display unit is in dBm?

You may convert dBm to dBmV by using the following equations:
If the load, Z = 50 ohm
dBmV = 20 log (V/1m)
dBmV =20 log (sqrt(P*Z)/1m)
dBmV = 20 log (sqrt(P*Z) - 20 log (1m)
dBmV = 10 log P + 10 log Z - 10 log ((1m)^2)
dBmV = (10 log (P/1m) + 10 log (1m) )+ 10 log Z - 10 log ((1m)^2)
dBmV = dBm + 10 log (Z* 1000)
Thus,
dBmV = dBm + 47

Example:
What is the dBmV value if power meter read 0dBm and the load is 50 ohm?
Solution:
dBmV = 0 + 47
Yield,
dBmV = 47dBmV