Work out your target heart rate training zones, and check which category your blood pressure reading falls into.
| Zone | Intensity | Target range |
|---|---|---|
| Zone 1 | Very light (50–60%) | — |
| Zone 2 | Light / warm-up (60–70%) | — |
| Zone 3 | Moderate / fat burn (70–80%) | — |
| Zone 4 | Hard / cardio (80–90%) | — |
| Zone 5 | Maximum effort (90–100%) | — |
| Category | Systolic (mmHg) | Diastolic (mmHg) |
|---|---|---|
| Low | Below 90 | or below 60 |
| Normal | Below 120 | and below 80 |
| Elevated | 120 – 129 | and below 80 |
| Hypertension Stage 1 | 130 – 139 | or 80 – 89 |
| Hypertension Stage 2 | 140 or higher | or 90 or higher |
| Hypertensive crisis | Above 180 | and/or above 120 |
Heart rate zones are estimated using the standard 220-minus-age formula for maximum heart rate, with an optional Karvonen calculation that factors in your resting heart rate for a more personalized range.
Enter your age to calculate your estimated maximum heart rate and training zones, and optionally enter your resting heart rate for a more personalized Karvonen-based calculation. Separately, enter your systolic (top number) and diastolic (bottom number) blood pressure readings to see which category they fall into based on standard guidelines. Both calculations run independently, so you can use either one on its own or both together for a fuller picture of your cardiovascular numbers.
Training zones divide your heart rate range into percentage bands of your maximum heart rate, each associated with different training effects. Lower zones (roughly 50-60% of max) are used for easy recovery and warm-up activity. Moderate zones (60-70%) build general aerobic fitness and fat metabolism efficiency. Higher zones (70-85%) improve cardiovascular capacity and are typical of sustained, challenging cardio work. The highest zones (85%+) are reserved for short, intense efforts like sprint intervals, since they can't be sustained for long periods. Training across a mix of zones over time, rather than staying in just one, is generally recommended for balanced fitness development.
The simplest way to estimate maximum heart rate is subtracting your age from 220 — a formula that's been used for decades because it's easy to calculate, even though research has shown it's a rough approximation with meaningful individual variation. Actual maximum heart rate can vary significantly between two people of the same age due to genetics, fitness level, and other factors. The Karvonen method improves on this somewhat by incorporating resting heart rate into the calculation, producing training zones that better reflect an individual's actual cardiovascular reserve rather than relying purely on age.
A blood pressure reading has two numbers: systolic (the higher, first number) measures the pressure in your arteries when your heart beats and pumps blood out, while diastolic (the lower, second number) measures the pressure when your heart rests between beats. Both numbers matter for assessing cardiovascular health, and elevated readings in either one — even if the other stays in a normal range — can indicate a category shift, as shown in the table above where categories are defined by whichever number falls into the higher-risk range.
Blood pressure isn't a fixed number — it naturally fluctuates based on activity, stress, hydration, caffeine intake, time of day, and even the specific moment of measurement. A single elevated reading, especially right after exercise, caffeine, or a stressful moment, doesn't necessarily indicate a chronic condition. This is why healthcare providers typically look at multiple readings over time, often taken at rest and at consistent times of day, rather than diagnosing based on any single measurement — a pattern this calculator can't capture from one reading alone.
A single reading in the "hypertensive crisis" range, especially if accompanied by symptoms like severe headache, chest pain, shortness of breath, or vision changes, warrants immediate medical attention rather than waiting to retest. Consistently elevated readings across multiple checks, even without symptoms, should be discussed with a healthcare provider, since sustained high blood pressure is a significant risk factor for heart disease and stroke even when it doesn't cause noticeable symptoms day to day.
Should I measure blood pressure sitting or standing? Standard guidance recommends sitting with your back supported and feet flat on the floor for a few minutes before measuring, since posture and recent activity can meaningfully affect the reading.
Is a lower heart rate always better? Generally, a lower resting heart rate reflects better cardiovascular fitness within a normal range, but an unusually low heart rate combined with symptoms like dizziness or fatigue should be discussed with a doctor rather than assumed to be simply "very fit."
Do heart rate zones apply the same way to everyone? Individual fitness level, medications (particularly beta-blockers), and health conditions can shift what zones feel like or mean for a given person, so these are general estimates rather than individually calibrated targets.
Can this calculator diagnose hypertension? No — this tool categorizes a single reading against standard guidelines for informational purposes only. A hypertension diagnosis requires multiple readings over time and should be made by a healthcare provider.
Resting heart rate is influenced by a mix of factors beyond just fitness level. Genetics play a meaningful role, as does age — resting heart rate tends to be relatively higher in infants and children, settling into the typical adult range by adolescence. Stress, dehydration, caffeine, certain medications, and illness can all temporarily raise resting heart rate. Regular cardiovascular exercise over weeks and months tends to lower resting heart rate as the heart becomes more efficient at pumping blood, which is part of why a lower resting heart rate is often used as a general fitness indicator among otherwise healthy individuals.
Beyond genetics, several modifiable lifestyle factors influence blood pressure over time. Sodium intake is one of the most well-studied, with high-sodium diets linked to elevated blood pressure in many individuals. Regular physical activity, maintaining a healthy body weight, limiting alcohol intake, and managing stress all contribute to healthier blood pressure readings over the long term. Sleep quality also plays a role — chronic poor sleep has been associated with higher blood pressure readings. None of these factors act in isolation, which is why healthcare providers typically look at overall lifestyle patterns rather than any single variable when discussing blood pressure management.
Last reviewed by Mehmed on July 11, 2026.