Understanding Your Blood Pressure Numbers

Author: Dr. Vrolijk   |   Updated: August 23, 2025   |   Disclaimer   |   Review Process   |   References

Author: Dr. Vrolijk   

Updated: August 23, 2025   

Disclaimer   |   Review Process   |   References

If you aren’t sure what your readings mean, this guide will help you make sense of them. It includes how to use multiple readings to find your overall blood pressure, and what each blood pressure zone might mean for you.

A lot of things can change your blood pressure reading. That’s why we include tips for getting readings you can trust. This way you can work with your doctor and feel more confident about what your numbers mean.

Find Your Blood Pressure Zone

Find Your Overall Blood Pressure

Your blood pressure changes during the day. Use 2 or more readings from different days to see what your blood pressure is most of the time.

This tool finds the average of your readings. Your average shows what your blood pressure is overall.

This tool is being tested. Double-check your result if needed.
Top # Bottom #

Enter at least 2 readings to see your result.

This tool is for learning only. Always talk to your doctor about your blood pressure.

What Each Blood Pressure Zone Means

This chart is for learning only. Always talk to your doctor about your blood pressure.

✷ Everyone older than 13 has the same blood pressure ranges → Learn more about age & blood pressure

Getting Accurate Readings

Small things can make your blood pressure reading too high.

Top ways to get the right reading:
  1. Wait 30 minutes or more after caffeine, exercise or smoking
  2. Empty your bladder (go pee)
  3. Sit quietly before starting
  4. Get in the right position (feet on the ground, back supported, arm at heart level)

✷ You’re not alone if you feel anxious when you take your blood pressure. We have simple steps that can help  → Learn more about managing anxiety about readings

How to Take Your Blood Pressure

Getting the Right Equipment

Upper arm blood pressure monitors are better for most people. Wrist monitors can be a good choice if upper arm cuffs don’t fit you.

Important things to look for:
  1. The right fit
  2. A calibrated monitor (means it will take the right reading)
Buying the Best Monitor for You

Tracking Your Results

Keeping track of your readings is almost as important as taking your blood pressure. One measurement is like a photograph. It’s just your blood pressure at that moment. Writing down your numbers allows you to understand your blood pressure over time.

What to include:
  1. The date and time
  2. Your readings
  3. How you feel
Download: Tracking Form

What Your Numbers Mean by Age

13 and Younger

  • Your doctor uses charts based on how old and tall your child is 
  • Ask your doctor if you’re worried about your child’s blood pressure

13 - 65 Years Old

  • High blood pressure can hurt your heart and body over time
  • This is why it’s important to catch high blood pressure early
  • Lower blood pressure helps prevent health problems like heart attacks and strokes

65 and Older

  • Doctors used to think older adults should have higher blood pressure numbers
  • New studies showed that lower blood pressure helps older adults too
  • The results were so good that several large studies were stopped early so everyone could get treatment
  • This is why the goals are now the same for everyone

Quick Answers

Both numbers are important. This is why doctors treat blood pressure if either are high.

 

For example, your risk of heart problems or stroke doubles if:

  • Top number increases by 20 (e.g. goes from 120 -> 140)
  • Or the bottom number increases by 10 (e.g. goes from 90 -> 100)

Your blood pressure changes to make sure your brain, heart, and muscles have the blood they need.

Your blood pressure goes up when:

  • You wake up in the morning
  • You exercise
  • You get excited
  • You feel stressed (for some people this is why their blood pressure is higher at the doctor’s office)

Your blood pressure goes down when:

  • You’re relaxing
  • You’re sleeping
  • You’re feeling calm

These changes are normal and happen to everyone. This is why it’s important to take blood pressure 1-2 times a day. 

Go to the emergency room if:

  • You have symptoms like chest or back pain, severe headache, trouble moving or talking, or difficulty breathing

Call your doctor right away if:

  • Your blood pressure is 180/110 or higher
  • You’re pregnant and your blood pressure is 140/90 or higher

Schedule an appointment if:

  • Your blood pressure is 120/80 or higher on multiple readings taken on different days

→ Learn more about when blood pressure is an emergency

Related Articles

What Is Blood Pressure?

A plain-language explanation on what makes blood pressure change and how it works.

How to Take Your Blood Pressure

Learn what to do before, during, and after taking your blood pressure to make sure you get a number you can trust.

3 Most Imporatnt Changes for Better Blood Pressure

Find out which three changes matter most for lowering blood pressure, with simple ways to start each one.

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2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA Guideline for the Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines | JACC. Accessed July 11, 2025. 

A Randomized Trial of Intensive versus Standard Blood-Pressure Control. New England Journal of Medicine. 2015;373(22):2103-2116. 

Basile J, Bloch M. Overview of hypertension in adults. UpToDate. Published online October 18, 2024. Accessed July 11, 2025. 

Elliot W, Varon J. Evaluation and Treatment of Hypertensive Emergencies in Adults. UpToDate. Published online June 25, 2025. Accessed July 11, 2025. 

Fagius J, Karhuvaara S. Sympathetic activity and blood pressure increases with bladder distension in humans. Hypertension. 1989;14(5):511-517. 
 
 
Wright JT, Whelton PK, Johnson KC, et al. SPRINT Revisited: Updated Results and Implications. Hypertension. 2021;78(6):1701-1710. 

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