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Measuring binaural room impulse responses (BRIRs) for different rooms and different persons is a costly and time-consuming task. In this paper, we propose a method that allows to compute BRIRs from a B-format room impulse response (B-format RIR) and a set of head-related transfer functions (HRTFs). This enables to measure the room-related properties and head-related properties of BRIRs separately, reducing the amount of measurements necessary for obtaining BRIRs for different rooms and different persons to one B-format RIR measurement per room and one HRTF set per person. The BRIRs are modeled by applying an HRTF to the direct sound part of the B-format RIR and using a linear combination of the reflections part of the B-format RIR. The linear combination is determined such that the spectral and frequency-dependent interaural coherence cues match those of corresponding directly measured BRIRs. A subjective test indicates that the computed BRIRs are perceptually very similar to corresponding directly measured BRIRs.