How to Check Blood Pressure at Home Correctly (and What Is Normal)
A step-by-step guide to measuring blood pressure at home accurately, what readings are normal, and when high readings need a doctor.
By Dr Sujith ChadalaMBBS, MD (General Medicine)
Why home readings matter
A single reading in a busy clinic can be misleading — higher because of nerves, or lower on a calm day. A week of home readings gives a far better picture of your real blood pressure, helps confirm or rule out hypertension, and shows whether treatment is working.
Choose the right machine
- An automatic upper-arm monitor, ideally one listed as clinically validated.
- The correct cuff size: a cuff that is too small gives falsely high readings. Measure around the middle of your upper arm and check the range printed on the cuff.
- Bring the machine to your next appointment so it can be checked against the clinic reading.
Step-by-step: measuring correctly
- Avoid tea, coffee, smoking and exercise for 30 minutes before.
- Empty your bladder.
- Sit on a chair with back support, feet flat on the floor, legs uncrossed.
- Rest your arm on a table so the cuff is at heart level. Use bare skin, not over a sleeve.
- Sit quietly for five minutes. No talking, no phone.
- Take two readings, one minute apart, and write both down.
- Repeat morning (before medicines) and evening for seven days before a doctor visit.
What is normal?
| Reading (mmHg) | What it means |
|---|---|
| Below 120/80 | Normal |
| 120–134 / 80–84 at home | Above normal — lifestyle steps help |
| 135/85 or higher at home (average) | Suggests high blood pressure |
| 180/120 or higher | Very high — recheck after 5 minutes and seek care |
Ignore the first day's readings when calculating your average, and look at the overall pattern rather than one high number.
When to get help
Seek emergency care (call 108) if a reading is 180/120 mmHg or higher with chest pain, breathlessness, severe headache, blurred vision, weakness on one side or confusion. If readings are very high but you feel well, rest and recheck, then contact your doctor the same day.
Book a consultation if your home average is 135/85 mmHg or above, or if you are already on treatment and readings stay above target. Read more about blood pressure care or book an appointment.
Frequently asked questions
Are wrist BP machines accurate?
Upper-arm machines are more reliable. Wrist machines are very sensitive to wrist position and often give misleading readings. Use one only if an arm cuff does not fit.
Why is my BP higher at the clinic than at home?
Many people have a higher reading in the clinic because of anxiety, called white-coat hypertension. Home readings help your doctor see your true everyday blood pressure.
Which arm should I use?
Check both arms once. If one is consistently higher, use that arm for future readings and tell your doctor about the difference.
This article is for general education only and is not a substitute for professional medical advice, diagnosis or treatment. Please consult Dr Sujith Chadala or another qualified doctor about your specific situation. Created with AI assistance.