The invention relates to a method for determining an actual volume Vr of an injection-mouldable compound during an injection-moulding process, wherein the injection-mouldable compound is introduced into at least one cavity of the mould, comprising the steps of: a) determining a theoretical volume Vt from process variables at least during a filling phase of the injection-moulding process, b) determining and/or measuring at least one value for at least one compound pressure pM, characterized by the steps of c) selecting a material-specific compression k (p), corresponding to the value of pM, of the injection-mouldable compound, d) calculating an actual volume Vr by taking into account the compression k (p).