# Blood Pressure Calculator Classify your blood pressure reading using the ACC/AHA 2017 guidelines. Get your blood pressure category, risk level, and recommendations based. ## What this calculates Enter your blood pressure reading to see how it is classified according to the latest American College of Cardiology and American Heart Association (ACC/AHA) 2017 guidelines. Understand your cardiovascular risk level and get general recommendations. ## Inputs - **Systolic Pressure (top number)** (mmHg) — min 60, max 250 — The pressure when your heart beats - **Diastolic Pressure (bottom number)** (mmHg) — min 30, max 150 — The pressure between heartbeats ## Outputs - **Blood Pressure Reading** — formatted as text — Your systolic/diastolic blood pressure - **AHA Classification** — formatted as text — Blood pressure category per ACC/AHA 2017 guidelines - **Health Risk Level** — formatted as text — Associated cardiovascular risk - **Recommendation** — formatted as text — General guidance based on your reading ## Details Blood pressure is the force of blood pushing against the walls of your arteries. It is recorded as two numbers: systolic (the pressure when the heart beats) over diastolic (the pressure when the heart rests between beats). The ACC/AHA 2017 guidelines lowered the threshold for hypertension from 140/90 to 130/80 mmHg, which means more adults are now classified as having high blood pressure. The five categories are: Normal (below 120/80), Elevated (120-129/below 80), High Blood Pressure Stage 1 (130-139/80-89), High Blood Pressure Stage 2 (140+/90+), and Hypertensive Crisis (180+/120+). When systolic and diastolic fall into different categories, the higher category is used for classification. High blood pressure usually has no symptoms, which is why it is often called the "silent killer." Regular monitoring is essential. Lifestyle modifications including the DASH diet, regular exercise, maintaining a healthy weight, limiting sodium and alcohol, and managing stress can significantly reduce blood pressure. This tool is for educational purposes only and is not a substitute for professional medical advice. ## Frequently Asked Questions **Q: What is considered normal blood pressure?** A: According to the ACC/AHA 2017 guidelines, normal blood pressure is a systolic reading below 120 mmHg AND a diastolic reading below 80 mmHg. If either number is higher, the reading falls into a higher category. Blood pressure naturally fluctuates throughout the day, so a single reading may not represent your true average. Multiple readings taken at different times provide a more accurate picture. **Q: What changed in the 2017 blood pressure guidelines?** A: The ACC/AHA 2017 guidelines lowered the definition of hypertension from 140/90 mmHg to 130/80 mmHg. This change was based on evidence showing that cardiovascular risk increases significantly above 130/80. The update added a new "Elevated" category (120-129/below 80) and split hypertension into Stage 1 (130-139/80-89) and Stage 2 (140+/90+). As a result, approximately 46% of U.S. adults now qualify as having high blood pressure. **Q: How should I measure my blood pressure at home?** A: For accurate home readings, sit quietly for 5 minutes before measuring. Use a validated upper-arm cuff monitor, not a wrist monitor. Sit with your back supported, feet flat on the floor, and arm supported at heart level. Do not smoke, exercise, or consume caffeine for 30 minutes before measuring. Take 2-3 readings one minute apart and record the average. Measure at the same times each day. **Q: When should I seek emergency care for blood pressure?** A: A hypertensive crisis is a systolic reading above 180 mmHg and/or diastolic above 120 mmHg. If you get this reading, wait 5 minutes and measure again. If it remains this high, seek immediate medical attention, especially if you have symptoms like severe headache, chest pain, shortness of breath, vision changes, numbness, or confusion. Hypertensive emergencies can cause stroke, heart attack, and organ damage. --- Source: https://vastcalc.com/calculators/health/blood-pressure Category: Health & Fitness Last updated: 2026-04-21