Interactions derived from effective field theories of quantum chromodynamics have thus far failed to bind calcium nuclei beyond neutron number $N=40$, while nuclear density functionals typically place the neutron drip line near ${}^{70}\mathrm{Ca}$, at $N=50$. We present the chiral interaction ${\mathrm{N}}^3{\mathrm{LO}}_{\mathrm{Texas}}$, a combination of two- and three-nucleon potentials at fourth and third chiral order, respectively, with low-energy constants optimized using emulator-accelerated fits to few- and many-body data. This interaction accurately reproduces binding energies and charge radii of key nuclei with mass number $A=3$ to 208, important excited states, and nuclear matter near saturation. Using ab initio methods, coupled cluster and valence-space in-medium similarity renormalization group, we find that the calcium two-neutron drip line extends to ${}^{71}\mathrm{Ca}$.

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• Binding energy & masses
• Nuclear forces
• Nuclear matter
• Nuclear radii
• Nucleon-nucleon interactions
• Ab initio calculations
• Nuclear many-body theory