The confinement of the plasma in fusion devices is guaranteed by means of suitable magnetic fields that are generated, in the tokamak configuration, by three different set of coils. In the case of the toroidal field (TF) superconducting magnets during operation a steady current is imposed within the coil, generating a mainly toroidal stationary magnetic field. The evaluation of the static magnetic field has been performed here by means of the finite element (FE) open-source code FreeFem++. For the evaluation of static field in relevant cases for fusion applications, a fully 3D tool has been developed; it has been benchmarked both against simple analytical cases (e.g.