A technique for predicting the shape of Z‐pinch implosions based on gas jet nozzle geometry has been developed and tested against data from argon gas experiments on BLACKJACK 5. The prediction technique involves use of a code which calculates the gas distribution, as a function of nozzle geometry and initial gas input pressure, at the start of the implosion. The calculated gas distribution is then snowplowed to about 0.1 of its initial radius using the measured current waveform. When the snowplow calculation is stopped, the shape of the implosion is compared to experimental data from the associated pinch.The code 2‐DRZDELTA calculates the 2‐D axisymmetric time dependent solution for the viscous compressible Navier‐Stokes equations on a triangular gridded mesh. At the time corresponding to the arrival of pulsed power at the gas jet, the density profile of the expanding argon gas is frozen. This 2‐D density profile is then used as the starting point for the 2‐D snowplow code which computes the pinch dynamics driven by J x B forces in the snowplow approximation.This technique could be used to predict implosion shapes from nozzle geometry for any driver.