Would you like to know how high your daily calorie requirement is? With the calorie requirement calculator, you can calculate your individual calorie requirement.
The **calorie requirement calculator** determines your daily basal metabolic rate and active metabolic rate.

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To calculate the calorie requirement, the total metabolic rate is calculated using the sum of the basal metabolic rate and the active metabolic rate.
We explain what this is and how it is calculated below.

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The basal metabolic rate is the daily calorie consumption without any exercise. It is calculated here according to the **Harris-Benedict equation**, which was
developed in 1918 and is still considered to be a good guideline for calorie consumption today. The equation
takes into account the fact that body weight, height, age and gender influence the basal metabolic rate.

### Harris-Benedict equation for calculating the basal metabolic rate

The following applies for women: |

Metric |
655.1 + (9.56 × weightinkg) + (1.85 × heightincm) − (4.7 × ageinyears) |

Imperial |
655.1 + (4.34 × weightinpounds) + (4.7 × heightininches) − (4.7 × ageinyears) |

The following applies for men: |

Metric |
66.5 + (13.75 × weightinkg) + (5.0 × heightincm) − (6.76 × ageinyears) |

Imperial |
66.5 + (6.24 × weightinpounds) + (12.7 × heightininches) − (6.76 × ageinyears) |

The difference of the first summand is striking, namely 655 for women and 66.5 for men. This can be explained by the fact that the basal metabolic rate
in men is more strongly determined by body stature and the associated muscle mass. Men therefore
have a higher calorie requirement than women with regard to the basal metabolic rate according to the equation.

### Correction of basal metabolic rate with high BMI

If you have a BMI above 30 kg/m², i.e., you are severely overweight, a corrected body weight (Broca Index adjustment)
is automatically calculated in the calorie requirement calculation and included in the Harris-Benedict equation. This takes into account the fact that the basal metabolic rate per kilogram of body weight decreases as
the body fat percentage increases.
Click here for the BMI calculator.

## What other readers have also read

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In addition to the basal metabolic rate, the active metabolic rate is also used to calculate the calorie requirement. The active metabolic rate
is the amount of energy that is consumed in addition to the basal metabolic rate through work and leisure activities. A reliable calculation of the total
calorie consumption is made using the PAL factors ("physical activity level"). For this purpose, five typical lifestyles were defined for adults based
on their level of activity. Each of these lifestyles has a PAL factor that is derived from all the usual activities throughout the day. This is multiplied
by the basal metabolic rate to calculate the total calorie consumption. The smallest PAL factor indicates the lifestyle with the lowest level of activity.
The highest PAL factor of 2.0 to 2.4 is given to people with a high level of physical activity. On average, they consume more than twice their
basal metabolic rate in calories.

### The PAL factors used to calculate the active metabolic rate in detail

**Sitting or lying only (PAL 1.2)**

People with an exclusively sedentary or recumbent lifestyle
(e.g., old, infirm people)
**Sitting, hardly active (PAL 1.4-1.5)**

People with an almost exclusively sedentary way of working and few leisure activities
(e.g., people who work a great deal at a desk)
**Sitting, walking and standing (PAL 1.6-1.7)**

People with predominantly sedentary and occasionally standing or walking activities and no or only slightly strenuous leisure activities
(e.g., pupils, students, drivers, laboratory assistants)
**Predominantly standing/walking (PAL 1.8-1.9)**

People with predominantly walking or standing jobs
(e.g., housewives, waiters, craftsmen, shop assistants)
**Strenuous work/sport (PAL 2.0-2.4)**

People with physically demanding jobs (e.g., farmers, miners, competitive athletes)

### Increasing the PAL factor for intensive sport

If you participate in a significant amount of sport or strenuous leisure activities. (4 to 5 times per week for 30 to 60 minutes), the PAL value is increased by 0.3
units for the three activity levels "Sitting, hardly active", "Sitting, walking and standing" and "Predominantly standing/walking".

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The total metabolic rate is the sum of basal metabolic rate and active metabolic rate. It describes the amount of energy required per day to maintain weight.
It corresponds to the total calculated calorie requirement.

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Mr. Bold wants to calculate his daily calorie consumption and uses the calculator to determine the daily calorie requirement.

- Mr. Bold has a body weight of 120 kilograms.
- He has a height of 1.70 meters.
- He is 30 years old.
- Mr. Bold mainly performs office duties.

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Mr. Bold's basal metabolic rate is his daily calorie consumption without any exercise. It is calculated using the Harris-Benedict equation. This equation reads:

#### Harris-Benedict equation (metric)

66.5 + (13.75 × weightinkg) + (5.0 × heightincm) − (6.76 × ageinyears)

By inserting his inputs for weight, height and age into this equation, the following daily basal metabolic rate is determined to be:

#### Inserting Mr. Bold's values into the equation

66.5 + (13.75 × 120kg) + (5.0 × 170cm) − (6.76 × 30years) ≈ 2 364kcal/day

#### Preliminary basal metabolic rate for Mr. Bold

Mr. Bold's basal metabolic rate is 2 364kcal per day, subject to adjustment for his heavy weight according to the Harris-Benedict equation.

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Dependent on Mr. Bolds's body mass index (BMI) (evaluation of weight in comparison to height), the calculation of the basal
metabolic rate using the Harris-Benedict equation may be subject to adjustment. This is because if the BMI is greater than 30, a reducing correction factor for weight
is calculated before the equation is applied (Broca Index adjustment). This is because the basal metabolic rate per kilogram decreases with increasing body fat.

#### BMI of Mr. Bold

Mr. Bold's body mass index (BMI) is 120/1.70² ≈ 41.5

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As Mr. Bold's BMI is above 30, a correction factor for his weight, the Broca Index adjustment, is first determined. The weight thus corrected is then used
instead of his normal weight in the Harris-Benedict equation:

#### Broca Index adjustment for Mr. Bold

Mr. Bold's Broca Index adjustment is 0.75 × 170cm-100cm + 0.25 × 120kg=82.5kg

Accordingly, the corrected weight for Mr. Bold is now to be inserted into the Harris-Benedict equation.

#### Inserting Mr. Bold's Broca-corrected weight into the equation

66.5 + (13.75 × 82.5kg) + (5.0 × 170cm) − (6.76 × 30years) ≈ 1 849kcal/day

#### Corrected basal metabolic rate for Mr. Bold

Ultimately, Mr. Bold's basal metabolic rate after the Broca Index adjustment of his weight according to the Harris-Benedict equation is **1 849kcal** per day.

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As described above, the active metabolic rate is the amount of energy consumed in addition to the basal metabolic rate from work and leisure activities.
For this purpose, a certain PAL factor ("physical activity level") is assigned to the predominant activities of a person. This PAL factor then determines
the calculation of the active metabolic rate.

Mr. Bold mainly performs office duties. According to this, he receives a PAL factor of 1.45, whereby the following applies:
basal metabolic rate × PAL factor=total metabolic rate.

#### Active metabolic rate for Mr. Bold

Mr. Bold's daily active metabolic rate according to his PAL factor is 1 849kcal × 0.45=**832kcal.**

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Mr. Bold's daily total metabolic rate in kcal corresponds to the sum of his basal and active metabolic rate.

#### Total metabolic rate for Mr. Bold

Mr. Bold's daily total metabolic rate amounts to 1 849kcal + 832kcal=**2 681kcal.**

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The equation for converting kcal to kJ is 1kcal=4.18684 kJ

#### Mr Bold's daily total metabolic rate in kJoule

Mr Bold's total metabolic rate in kJ amounts to 2 681kcal × 4.18684=**11,225kJ**

With the Calorie-Joule Converter you can also conveniently convert between the two common units
calories and joules with a slider.

## Source information

As source for the information in the 'Calorie requirement' category, we have used in particular:

## Last update

This page of the 'Calorie requirement' category was last edited or reviewed by Stefan Banse on February 19, 2023. It corresponds to the current status.

### Changes in this category "Calorie requirement"

- Publication of the calorie calculator.
- Editorial revision of this page