A powerful new scheme is presented for analyzing capillary flow measurements on non‐Newtonian liquids. The basic disability of the capillary method, namely its inability to assign to a flow measurement any particular shear rate, or even a known range of shear rates, is overcome. This is accomplished by developing simple relations connecting the directly measured quantities, pressure and flow rate, with viscosity and shear rate. Application to Bingham bodies is easy and an illustration is given. Application to measurement at high rates of shear is immediate in principle, but there are certain allied measuring difficulties. These are discussed briefly. Finally, a simple approximate formula applicable to cases of moderate deviation from Newtonian behavior is given.