Skip to main content

Heart Rate Calculator

Calculate your target heart rate zones for exercise with our free heart rate calculator. Uses the Tanaka formula and Karvonen method to determine your max heart rate and five personalized training zones based on age and resting heart rate.

Loading calculator

Preparing Heart Rate Calculator...

Reviewed & Methodology

Every calculator is built using industry-standard formulas, validated against authoritative sources, and reviewed by a credentialed financial professional. All calculations run privately in your browser - no data is stored or shared.

Last reviewed:

Reviewed by:

Written by:

Read Methodology Report an Issue

How to Use the Heart Rate Calculator

  1. 1. Enter your age - your age is used to calculate your estimated maximum heart rate using the Tanaka formula (208 - 0.7 x age).
  2. 2. Enter your resting heart rate - measure your pulse first thing in the morning before getting out of bed for the most accurate value (typically 60-100 bpm for adults).
  3. 3. View your max heart rate - see your estimated maximum heart rate, which represents the upper limit of what your cardiovascular system can handle during exercise.
  4. 4. Review your five training zones - examine personalized zones from warm-up (50-60%) through peak (90-100%), each calculated using the Karvonen method based on your heart rate reserve.
  5. 5. Apply zones to your training - use the fat burn zone (60-70%) for endurance sessions and the cardio/hard zones (70-90%) for interval training and performance gains.

Heart Rate Calculator

Training in the right heart rate zone is essential for achieving your fitness goals, whether that is burning fat, building endurance, or improving cardiovascular performance. This calculator uses your age and resting heart rate to determine your maximum heart rate and five distinct training zones, helping you exercise at the right intensity every session.

How Target Heart Rate Zones Are Calculated

The calculator uses the Tanaka formula for maximum heart rate: Max HR = 208 - (0.7 x age), which research has shown to be more accurate than the older 220-minus-age formula. Training zones are then calculated with the Karvonen method: Target HR = (Heart Rate Reserve x intensity%) + Resting HR, where Heart Rate Reserve = Max HR - Resting HR. This approach personalizes zones based on your actual fitness level.

Example

InputValue
Age30 years
Resting Heart Rate70 bpm
ZoneHeart Rate Range
Max Heart Rate187 bpm
Warm Up (50-60%)129 - 140 bpm
Fat Burn (60-70%)140 - 152 bpm
Cardio (70-80%)152 - 164 bpm
Hard (80-90%)164 - 175 bpm
Peak (90-100%)175 - 187 bpm

Key Factors That Affect Your Heart Rate Zones

  • Age — maximum heart rate naturally declines with age, shifting all zones downward
  • Resting heart rate — fitter individuals have lower resting rates (40-60 bpm), which changes zone calculations
  • Fitness level — trained athletes may have higher actual max HR than formulas predict
  • Medications — beta-blockers and some other drugs can lower heart rate and alter training zones
  • Hydration and temperature — heat and dehydration can elevate heart rate by 10-20 bpm at the same effort level

Tips

  1. Measure your resting heart rate first thing in the morning before getting out of bed for the most accurate baseline
  2. Spend 70-80% of your training time in Zones 1-3 (below 80% intensity) for sustainable cardiovascular improvement
  3. Use the Fat Burn zone (60-70%) for longer sessions aimed at weight management
  4. If your resting heart rate exceeds 100 bpm consistently, consult a healthcare provider before beginning an exercise program

Frequently Asked Questions

What are the five heart rate training zones and what are they used for?
The five zones are: Zone 1 / Warm-Up (50-60% of max) for recovery and warm-up; Zone 2 / Fat Burn (60-70%) for endurance building and maximum fat oxidation; Zone 3 / Cardio (70-80%) for improving aerobic capacity; Zone 4 / Hard (80-90%) for threshold training and speed work; and Zone 5 / Peak (90-100%) for short bursts of maximum effort. Most recreational exercisers benefit most from spending 80% of training time in Zones 2-3 and 20% in Zones 4-5.
How accurate is the 220-minus-age formula for max heart rate?
The traditional 220-minus-age formula is simple but has a standard deviation of 10-12 bpm, meaning it can be off by that much in either direction. The Tanaka formula (208 - 0.7 x age), used in this calculator, has been shown in research to be more accurate, particularly for older adults. However, the only way to know your true max heart rate is through a supervised maximal exercise test. Individual variation is significant -- two 40-year-olds might have max heart rates of 165 and 195.
What is a normal resting heart rate and what does it indicate?
A normal resting heart rate for adults ranges from 60 to 100 bpm. Well-trained endurance athletes often have resting rates of 40-60 bpm due to a stronger, more efficient heart that pumps more blood per beat. A consistently elevated resting heart rate (above 100 bpm, called tachycardia) can signal dehydration, stress, illness, or cardiovascular issues and should be discussed with a healthcare provider. Tracking your resting heart rate over time is one of the simplest ways to monitor cardiovascular fitness improvements.
Why does the Karvonen method use heart rate reserve instead of just max heart rate?
The Karvonen method factors in your resting heart rate to calculate Heart Rate Reserve (HRR = Max HR - Resting HR), which personalizes your zones based on your current fitness level. A fit person with a resting HR of 50 and an unfit person with a resting HR of 85 would have identical zones if only max HR were used, but their actual training intensities would be very different. The Karvonen method ensures that someone who is already fit has appropriately higher zone thresholds.
Should I use a heart rate monitor during exercise?
A heart rate monitor provides real-time feedback that helps you train at the right intensity for your goals. Chest strap monitors are the most accurate (within 1-2 bpm of medical EKG), while wrist-based optical sensors on smartwatches can vary by 5-10 bpm, especially during high-intensity intervals. For steady-state cardio like running or cycling, either type works well. Heart rate monitoring is especially valuable during interval training to ensure you are reaching target zones during work intervals and recovering sufficiently during rest periods.

Explore More Health & Fitness Tools

BMI Calculator: Try our free bmi calculator for instant results.

Body Fat Calculator: Try our free body fat calculator for instant results.

Calorie Calculator: Try our free calorie calculator for instant results.

Health Insurance Calculator: Try our free health insurance calculator for instant results.

Disability Insurance Calculator: Try our free disability insurance calculator for instant results.

Life Insurance Calculator: Try our free life insurance calculator for instant results.

Related Health & Fitness Calculators

Health & Fitness

Blood Alcohol Calculator

Estimate your blood alcohol concentration (BAC) with our free calculator. Enter your weight, gender, number of drinks, and time elapsed to see your estimated BAC level, impairment effects, and approximate time until sober. For educational purposes only.

Health & Fitness

BMI Calculator

Calculate your Body Mass Index (BMI) instantly with our free online BMI calculator. Enter your height and weight to see your BMI category, healthy weight range, and what your results mean for your health.

Health & Fitness

Body Fat Calculator

Estimate your body fat percentage using the U.S. Navy method with our free calculator. Enter your measurements to get body fat %, fat mass, lean mass, and your body composition category.

Health & Fitness

Body Surface Area Calculator

Calculate your body surface area (BSA) using multiple formulas with our free calculator. Enter your height and weight to see BSA results from the Du Bois, Mosteller, Haycock, and Gehan-George methods, used in drug dosing, burn assessment, and clinical medicine.

Calculators