Electric generators are common in everyday life, from AC generators to DC generators. Each type of generator has a different character, this affects the use of the generator. One type of DC generator is a synchronous DC generator. This research was conducted to determine the performance of the generator by calculating and simulating the parameters in the form of resistance and inductance produced by the generator under no-load and loaded conditions. In the experiment, voltage variations were carried out starting from 2 V -12 V under no-load and loaded conditions. Load resistors are used with variations of 50Ω, 100Ω and 200Ω. The measurement results of the synchronous DC generator parameters are as follows 𝐿 𝑎 0.926 H, 𝑅 𝑎 1.559Ω, 𝐿 𝑓 2.566 H and 𝑅 𝑓 15.630Ω. As a result, the DC generator has a calculated efficiency value of 67.94% for a generator without a load, 67.97% for a generator with a 50 load, 68.12% for a generator with a 100 load and 68.17% for a 200-loaded generator. While the simulation efficiency value is 79.80% for generator without load, 81.39% for generator with 50Ω load, 81.71% for generator with 100Ω load and 81.05% for generator with 200Ω load. These results indicate that the generator condition is inefficient because the parameter values have been distorted both on the stator and rotor sides, so that the generated flux cannot induce a voltage according to the initial conditions of the generator.