The normal systolic pressure in human beings is :

Blood pressure is the force exerted by blood against the walls of blood vessels, which is significantly higher in arteries than in veins [1]. It is recorded using two measurements: systolic and diastolic pressure. Systolic pressure represents the force in the arteries during ventricular contraction (systole), while diastolic pressure represents the force when the heart relaxes (diastole) [1]. According to medical standards, the normal systolic pressure in a healthy human adult is approximately 120 mm of Hg, and the normal diastolic pressure is 80 mm of Hg [2]. Readings between 120-129 mm Hg are often classified as elevated, while 130 mm Hg or higher is considered hypertension. Blood pressure is typically measured using a sphygmomanometer [1]. Therefore, 120 mm of Hg is the standard normal systolic value.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Blood pressure > p. 93
2. [2] https://www.fda.gov/drugs/special-features/high-blood-pressure-understanding-silent-killer