36 Hour Fast Calculator

36 Hour Fast Calculator calculator can be used to determine the time needed to reach a target heart rate zone based on your age and resting heart rate.

Input Parameters

Calculation Results

Calculation Formula

Target Heart Rate (bpm) = Resting Heart Rate × Zone Percentage

Where:
Target Heart Rate (bpm) is the heart rate you should aim for in your workout
Resting Heart Rate is your heart rate when at rest
Zone Percentage is the desired intensity level as a decimal

36 Hour Fast Calculator Calculator Usage Guide

Learn how to use the 36 Hour Fast Calculator calculator and its working principles

How to Use This Calculator

  1. Enter your age in years.
  2. Enter your resting heart rate in beats per minute (bpm). You can find this by taking your pulse for 30 seconds and multiplying by 2.
  3. Select your desired target heart rate zone from the dropdown menu.
  4. Click the "Calculate" button to see your target heart rate and an estimated time to reach that rate.

Understanding Heart Rate Zones

The calculator uses the following heart rate zones, which are based on percentages of your maximum heart rate (MHR):

  • Zone 1 (50-70%): Light intensity. Good for warm-ups and recovery.
  • Zone 2 (70-85%): Moderate intensity. Suitable for most cardiovascular workouts.
  • Zone 3 (85-100%): High intensity. Good for improving cardiovascular fitness.
  • Zone 4 (100-120%): Very high intensity. Intense interval training.
  • Zone 5 (120-150%): Extreme intensity. Very intense interval training, often unsustainable for long periods.

Important Notes

This calculator provides an estimate based on simple formulas and should not replace professional medical advice. Always consult with a healthcare provider before starting a new exercise program, especially if you have any health concerns.