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Numerical models that calculate the fluid dynamics of explosive volcanic eruptions have been used with increasing frequency to understand volcanic processes and evaluate volcanic hazards. Yet those who develop such models rarely make them publicly available so that they can be verified, used, and possibly improved by other scientists. In this paper I present a visual, interactive, open‐source numerical model that calculates steady state flow of magma and gas in vertical eruptive conduits and contains user‐friendly utilities for quickly determining physical, thermodynamic, and transport properties of silicate melts, H₂O gases, and melt‐gas‐crystal mixtures. The model represents an advance over previously published conduit models by incorporating a non‐Arrhenian viscosity relation for hydrous silicate melts, a relation between viscosity and volume fraction of gas that depends on Capillary number, and adiabatic …