Resting Energy Requirement Calculator

Estimate your daily energy needs at rest using standard equations. This calculator can be used for nutritional planning, weight management, and patient care.

Input Parameters

Calculation Results

Calculation Formula

The Resting Energy Requirement (RER) is calculated using the Harris-Benedict equation:

For Men:
RER = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years)

For Women:
RER = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years)

Where:
RER = Resting Energy Requirement (kcal/day)
Weight = Body weight in kilograms
Height = Height in centimeters
Age = Age in years

Your Result

Your Resting Energy Requirement (RER):

0 kcal/day

This is the amount of energy your body needs to maintain basic physiological functions at rest.

Resting Energy Requirement Calculator Usage Guide

Learn how to use the calculator and understand your energy needs at rest

How to Use This Calculator

  1. Enter your gender, age, weight in kilograms, and height in centimeters.
  2. Click the "Calculate" button to determine your Resting Energy Requirement.
  3. Your result will be displayed in kilocalories per day (kcal/day).

Understanding Your Results

The Resting Energy Requirement (RER) represents the amount of energy needed to maintain basic physiological functions at rest. This includes maintaining your basal metabolic rate (BMR) plus the energy needed for minimal digestion and absorption of food.

Your RER is different from your Total Daily Energy Expenditure (TDEE), which includes the energy cost of all physical activities. For example, if you have a sedentary lifestyle, your TDEE would be approximately 1.2 × RER. If you are very active, your TDEE might be 1.9 × RER.

Practical Applications

  • Nutritional Planning: Helps determine appropriate calorie intake for weight maintenance, loss, or gain.
  • Patient Care: Useful for hospitalized patients, especially those with metabolic stress.
  • Recovery: Assists in planning post-surgical or post-injury nutrition.
  • General Health: Provides a baseline for understanding your daily energy needs.

Note: This calculator provides an estimate based on standard equations. Individual needs may vary based on factors such as muscle mass, metabolic rate, and specific health conditions. For personalized nutrition advice, consult with a healthcare professional or registered dietitian.