Dark matter particles, if sufficiently light, may be produced in decays of the Higgs boson. This document presents a statistical combination of searches for the resulting $H\to\text{invisible (inv)}$ decays where $H$ is produced according to the Standard Model via vector boson fusion, $Z(\ell\ell)H(\text{inv})$, and W\!/\!Z(\text{had})H(\text{inv}), all performed with the ATLAS detector using 36.1 fb$^{-1}$ of $pp$ collisions at a center-of-mass energy of $\sqrt s = 13$ TeV at the LHC. In combination with the results at $\sqrt s = 7$ and 8 TeV, an exclusion limit on the $H\to\text{inv}$ branching ratio of \mathcal B_{H\to\text{inv}} < 0.26~(0.17^{+0.07}_{-0.05}) at 95% confidence level is observed (expected).

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