Blood Pressure Log
Log and track your blood pressure readings over time. View average readings, trends, and category classifications. All data stays private in your browser.
Understanding Blood Pressure Readings
Blood pressure is measured in millimeters of mercury (mmHg) with two numbers: systolic (pressure when heart beats) over diastolic (pressure between beats). Normal blood pressure is below 120/80 mmHg. Elevated blood pressure is 120-129 systolic with diastolic below 80. Stage 1 hypertension is 130-139 systolic or 80-89 diastolic. Stage 2 hypertension is 140+ systolic or 90+ diastolic. A hypertensive crisis occurs at 180+ systolic or 120+ diastolic — this requires immediate medical attention. Regular monitoring helps detect hypertension early, as it often has no symptoms but significantly increases the risk of heart attack and stroke.
Why Track Blood Pressure Over Time
A single blood pressure reading only captures one moment. Blood pressure naturally fluctuates throughout the day based on activity, stress, caffeine intake, and time of day. Morning readings tend to be higher than afternoon readings. White coat hypertension causes elevated readings in a doctor's office but normal readings at home. Masked hypertension shows normal readings at the doctor but high readings elsewhere. Tracking multiple readings over weeks reveals your true average blood pressure, giving you and your doctor a much more accurate picture of cardiovascular health. Home monitoring has been shown to be a better predictor of cardiovascular events than office readings alone.
Tips for Accurate Blood Pressure Measurement
For accurate readings, sit quietly for 5 minutes before measuring. Use the same arm each time, supported at heart level. Do not talk during measurement. Avoid caffeine, exercise, and smoking for 30 minutes beforehand. Empty your bladder first. Take two readings 1-2 minutes apart and record both. Measure at the same times each day for consistency. Use a validated, properly fitting cuff — too small a cuff gives falsely high readings. Keep a regular log and share it with your healthcare provider at each visit. This tool stores all readings locally in your browser for complete privacy.