For an exact differential form on a Riemannian manifold to have a primitive bounded by a given function $f$, by Stokes it has to satisfy some weighted isoperimetric inequality. We show the converse up to some constants if $M$ has bounded geometry. For a volume form, it suffices to have the inequality ($\left|\Omega \right|\le {\int }_{\partial \Omega }f\mathrm{d}\sigma$ for every compact domain $\Omega \subset M$). This implies in particular the “well-known” result that if $M$ is the universal covering of a compact Riemannian manifold with non-amenable fundamental group, then the volume...