We present the calibration of a 1D ejector model on experimental data from a large-scale ejector facility at the von Karman Institute. The facility allows for adjusting the inlet pressures (with pressure ratios up to 5) and temperatures (with temperature ratios up to 1.6) and producing mass flow rates up to 0.7 kg/s. The experimental data are used to calibrate an ejector model consisting of two interacting 1D domains based on the compound choking theory. The model closure is carried out in terms of friction factor for the primary flow and a variable loss coefficient for the secondary flow. These were successfully linked to the ratios of inlet and outlet pressures, allowing the calibrated model to predict both mass flow rates with 10 % accuracy.