LISA’s capability to measure SN Ia merger rates (ℛ_SNIa) from double-degenerate SN Ia progenitors at frequencies between 2 and 10 mHz for different SN Ia rates. Solid lines represent the results of the Monte Carlo simulation where we combined uncertainties in the number count of SN Ia progenitors (assumed to be Poisson-distributed) with LISA’s ability to measure the chirp mass. Dashed lines show the number count error only.