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Heart Rate Calculator to Calculate MHR, THR, and Training Zones

Calculator Preferences
Heart Rate Calculator Sign
Heart Rate Calculator

This calculator is actually five heart rate calculators all rolled into one. Calculate your maximum (MHR), target (THR), and reserve (RHR) heart rates, plus calculate your resting heart rate health category and create a personal, printable heart rate training zone chart. The Notes tab includes:

  • How the calculator came to be.
  • Heart rate formulas.
  • How to check your heart rate, and a shortcut method.
Learn More

Selected Data Record:

A Data Record is a set of calculator entries that are stored in your web browser's Local Storage. If a Data Record is currently selected in the "Data" tab, this line will list the name you gave to that data record. If no data record is selected, or you have no entries stored for this calculator, the line will display "None".

DataData recordData recordSelected data record: None
Age:Your age:Your current age:Your current age:

Your current age:

Enter your current age.



Select male or female.

Avg RHR:Average RHR:Average resting heart rate (RHR):Average resting heart rate (RHR):

Average resting heart rate (RHR # beats per minute):

Before you get out of bed in the morning, and prior to any physical exertion, count the number of times your heart beats during a 1-minute time period. Repeat for several mornings and enter the average here. Note that you can feel your heart beat by placing your index and middle fingers on your neck, just to either side of your adams apple.

Intensity:Intensity level:Intensity level:Intensity level:

Intensity level:

Select your desired level of intensity. The percentages represent a target percentage of your maximum heart rate. Most resources I studied recommended target rates between 50% and 85% of your maximum -- hence the 65% default setting.

Include chart:Include chart:Include Training Zone Chart:Include Heart Rate Training Zone Chart:

Include Heart Rate Training Zone Chart:

Move the slider to "Yes" position if you would like the results to include a custom training zone heart rate chart with the results. Note that the chart will be created using the Zoladz method of creating exercise zones.

Max rate:Maximum rate:Maximum heart rate (MHR):Maximum heart rate (MHR):

Maximum heart rate (MHR):

Based on your age and gender, and the MHR formulas listed under the Notes tab, this is your estimated maximum heart rate (MHR) in beats per minute (BPM). Note that another of many methods for calculating MHR is simply MHR = 220 - age. With so many MHR formulas available be sure to consult with a qualified medical physician to assist you with calculating your maximum heart rate.

Rate reserve:Rate reserve:Heart rate reserve (HRR):Heart rate reserve (HRR):

Heart rate reserve (HRR):

This is the difference between your calculated maximum heart rate and your resting heart rate.

Target (c):Target (classic):Target heart rate, classic method:Target heart rate, classic method:

Target heart rate, classic method:

Based on your entries, this is your target heart rate without factoring in your specific resting heart rate. The formula used by the heart rate calculator is THR = ((MHR - 70) * % intensity) + 70.

Target (K):Target (Karvonen):Target heart rate, Karvonen method:Target heart rate, Karvonen method:

Target heart rate, Karvonen method:

Based on your entries, this is your target heart rate after factoring in your resting heart rate. The Karvonen formula this result is based on is THR = ((MHR - RHR) * % intensity) + RHR;

Resting rtg:Resting rating:Resting heart rate rating:Resting heart rate rating:

Resting heart rate rating:

Based on your age, resting heart rate, and the charts located at, this is the category your average resting heart rate falls within. Note that if your age and/or resting heart rate fall outside of the chart, this field will display N/A.

If you would like to save the current entries to the secure database, tap or click on the Data tab, select "New Data Record", give the data record a name, then tap or click the Save button. To save changes to previously saved entries, simply tap the Save button. Please select and "Clear" any data records you no longer need.

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Help and Tools

Help and Tools:

This section, which you can Unstick or Hide in the Calculator Preferences (just above the top of the calculator), contains the following tabs (content too long to fit within bordered frame can be scrolled up and down):

About: Click this tab for an introduction to the calculator.

Instructions: Click this tab for step-by-step instructions for using the calculator.

Terms: Click this tab for a list of the descriptions that are located within each popup help button (info icons).

PCalc: Click this tab for a handy "pocket" calculator you can use when you need to calculate an entry needed for the calculator.

Data: Click this tab to save a set of entries or a note in between visits. Entries and notes will be stored to your web browser's local storage (if supported by your browser of choice), meaning they can only be recalled with the same device and web browser you were using when you saved them. If you'd like to save entries and notes between devices you can do so by subscribing to the Ad-Free Member Version.



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Adjust Calculator Width:

Move the slider to left and right to adjust the calculator width. Note that the Help and Tools panel will be hidden when the calculator is too wide to fit both on the screen. Moving the slider to the left will bring the instructions and tools panel back into view.

Also note that some calculators will reformat to accommodate the screen size as you make the calculator wider or narrower. If the calculator is narrow, columns of entry rows will be converted to a vertical entry form, whereas a wider calculator will display columns of entry rows, and the entry fields will be smaller in size ... since they will not need to be "thumb friendly".

Show/Hide Popup Keypads:

Select Show or Hide to show or hide the popup keypad icons located next to numeric entry fields. These are generally only needed for mobile devices that don't have decimal points in their numeric keypads. So if you are on a desktop, you may find the calculator to be more user-friendly and less cluttered without them.

Stick/Unstick Tools:

Select Stick or Unstick to stick or unstick the help and tools panel. Selecting "Stick" will keep the panel in view while scrolling the calculator vertically. If you find that annoying, select "Unstick" to keep the panel in a stationary position.

If the tools panel becomes "Unstuck" on its own, try clicking "Unstick" and then "Stick" to re-stick the panel.