The measured (minimum) mass of a planet will the true mass of the planet times the sine of the inclination.
MRV = Mtrue sin i (or simply "m sin i" for short)
And conversely,
Mtrue = MRV / sin i.
The amplitude of the RV variations, K, is used to determine the mass of the planet using the following formula.
K = (2πastar sin i) / P*√(1 - e2)
Where astar is the semi-major axis of the star around the system barycentre, P is the orbital period, and e is the eccentricity. The K value can be used to find the masses of the two components with the "mass function":
[(mstar sin i)3) / (mstar + mplanet)2)] = P / 2πG * K3(1 - e2)3/2
Where G is the gravitational constant. In a planetary system, since the mass of the star will be much greater than that of the planet, you can simplify the mass function down to
mp sin i ~= (P/2πG)1/3 Kmstar2/3 (1 - e2)1/2
_________________
Caps Lock: Cruise control for 'Cool'!