Blood pressure is measured by two numbers, the systolic pressure (the higher number) and diastolic pressure (lower).
High blood pressure is considered to be 140/90 millimetres of mercury (mmHg) or higher.
Or if you’re over the age of 80, 150/90mmHg or higher is considered too high.
Ideal blood pressure is usually considered to be between 90/60mmHg and 120/80mmHg.