In one embodiment, a system comprises a band； a pressure actuator to apply external pressure through the band to a part of a human body； circuitry to control the pressure actuator to apply the external pressure changing only in a pressure range less than 80 mmHg in a measurement mode； a pressure sensor to sense, from the band, a waveform signal responsive to an application of the external pressure by the pressure actuator in the measurement mode, wherein the waveform signal is indicative of a pressure response of arterial pressure； a pulse waveform velocity (PWV) sensor to sense one or more signals associated with PWV； and a processor to calculate a blood pressure value based on the waveform signal from the pressure sensor and the signal(s) associated with PWV.
