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BEE Calculator

Health

Calculate your Basal Energy Expenditure (BEE) using the original 1919 Harris-Benedict equation to find the calories your body burns at complete rest.

Reviewed by the thecalcu.com team · Last updated July 21, 2026

1580
30200
100250

BEE (kcal/day)

1,499
BEE (kJ/day)
6,271
Calories per Hour
62.4

This calculator computes your BEE (kcal/day), BEE (kJ/day), Calories per Hour from the values you enter.

Inputs
GenderAgeWeightHeight
Outputs
BEE (kcal/day)BEE (kJ/day)Calories per Hour

What is a BEE?

The BEE Calculator estimates your Basal Energy Expenditure, the number of calories your body burns in a full day while at complete rest, covering only the energy needed to keep your organs, brain, and cells functioning. This tool uses the original 1919 Harris-Benedict equation, one of the earliest and most historically significant predictive formulas in nutrition science, derived from Harris and Benedict's landmark study measuring resting metabolism across hundreds of subjects.

Unlike calculators that estimate your total daily calorie needs including activity, BEE is a resting-only figure, it's the calorie "floor" your body needs regardless of how active you are. For a total daily estimate that includes movement and exercise, see the TDEE Calculator or the activity-adjusted Harris-Benedict Calculator, which uses the more commonly cited revised 1984 version of this same equation family.

Why Use a BEE Calculator?

Some clinical references, historical nutrition literature, and legacy diet software specifically cite the original 1919 Harris-Benedict coefficients rather than the revised 1984 version or newer equations like Mifflin-St Jeor. This calculator lets you reproduce that exact historical formula when you need to match a specific reference point or compare it against more modern methods.

It's also useful as an educational tool for understanding how resting metabolic rate prediction has evolved, comparing your BEE here against your result on the BMR Calculator (Mifflin-St Jeor) shows how much predictive equations have shifted over a century of research.

Who Should Use This Calculator?

  • Nutrition students and researchers studying the history and evolution of metabolic rate prediction equations.
  • Clinicians using legacy protocols that specifically reference the original 1919 Harris-Benedict formula rather than its 1984 revision.
  • Anyone comparing calculator methodologies who wants to see how the original Harris-Benedict figures differ from the Harris-Benedict Calculator's revised equation or the BMR Calculator's Mifflin-St Jeor method.
  • People replicating older diet plans or software output that was built on the 1919 coefficients.
  • Anyone curious about the historical baseline their body needs before factoring in any activity, best paired with the TDEE Calculator for a full picture.

What Insights Does the BEE Calculator Give You?

  • BEE (kcal/day), the primary result, your estimated resting energy expenditure over 24 hours using the original 1919 Harris-Benedict formula.
  • BEE (kJ/day), the same value converted to kilojoules, useful for regions and contexts that use kilojoule-based nutrition labeling.
  • Calories per Hour, your BEE divided evenly across 24 hours, giving a sense of your baseline hourly energy burn at complete rest.

Remember this figure represents rest only, it does not include digestion (thermic effect of food), daily movement, or exercise, all of which add meaningfully to your true total daily calorie need.

How to use this BEE calculator

  1. Select your Gender, Male or Female, since the original equation uses different coefficients for each.
  2. Enter your Age in years using the slider or number field.
  3. Enter your Weight in kilograms.
  4. Enter your Height in centimeters.
  5. Review your BEE (kcal/day) result, along with the kilojoule conversion and hourly rate.
  6. To estimate your full daily calorie need including activity, take this BEE figure to the TDEE Calculator or use the activity-adjusted Harris-Benedict Calculator directly.
Show formula & methodology ↓Show less ↑

Formula & Methodology

The original 1919 Harris-Benedict equation uses separate formulas for men and women:

Men:   BEE = 66.5 + (13.75 × weight in kg) + (5.003 × height in cm) − (6.755 × age in years) Women: BEE = 655.1 + (9.563 × weight in kg) + (1.850 × height in cm) − (4.676 × age in years)

Worked example: A 30-year-old man weighing 70 kg and standing 170 cm tall has a BEE of 66.5 + (13.75 × 70) + (5.003 × 170) − (6.755 × 30) = 66.5 + 962.5 + 850.5 − 202.65 ≈ 1,677 kcal/day. Converted to kilojoules, that's approximately 7,016 kJ/day, or about 70 kcal per hour at complete rest.

This figure represents basal energy needs only, no activity multiplier is applied. For everyday calorie planning, most modern nutrition guidance favors the Mifflin-St Jeor equation (used in the BMR Calculator) or the revised 1984 Harris-Benedict equation (used in the Harris-Benedict Calculator), both considered more accurate for contemporary populations.

Frequently Asked Questions

What does BEE stand for?
BEE stands for Basal Energy Expenditure, the number of calories your body burns in 24 hours while completely at rest, no digestion, no movement, no activity of any kind. It represents the baseline energy your organs, brain, and cells need simply to keep you alive.
What formula does this BEE calculator use?
This calculator uses the original 1919 Harris-Benedict equation, published by James Arthur Harris and Francis Gano Benedict, which estimates basal energy expenditure from weight, height, age, and sex. It predates the commonly cited 1984 revision and uses its own original coefficients.
Is BEE the same as BMR?
BEE and BMR (Basal Metabolic Rate) both describe resting energy needs and are often used interchangeably in casual conversation, but strictly, BMR is measured under stricter laboratory conditions (post-fasting, post-sleep) while BEE is typically estimated from a predictive equation like this one. This calculator presents the original 1919 Harris-Benedict formula specifically as basal energy expenditure.
How is the BEE calculator different from the Harris-Benedict calculator on this site?
This BEE Calculator uses the original 1919 Harris-Benedict equation and reports a resting-only value with no activity adjustment. The separate [Harris-Benedict Calculator](/harris-benedict-calculator/) uses the commonly cited revised 1984 equation and multiplies it by an activity level to estimate your Total Daily Energy Expenditure (TDEE), a different, activity-inclusive result.
Why would I use the 1919 formula instead of the revised 1984 version?
Some clinicians, historical references, and legacy nutrition software still cite the original 1919 coefficients, so this calculator is useful for cross-checking or replicating those specific figures. For everyday calorie planning most people should prefer the [Harris-Benedict Calculator](/harris-benedict-calculator/)'s revised 1984 equation or the [BMR Calculator](/bmr-calculator/)'s Mifflin-St Jeor formula, both considered more accurate by modern research.
Does this calculator account for activity level?
No, BEE as calculated here is a resting-only figure with no activity multiplier applied. To estimate your total daily calorie burn including exercise and daily movement, use the [TDEE Calculator](/tdee-calculator/) or the activity-adjusted [Harris-Benedict Calculator](/harris-benedict-calculator/).
What inputs does the BEE calculator need?
You need your sex, age in years, weight in kilograms, and height in centimeters. These are the same four variables the original Harris-Benedict researchers used in 1919 to derive their prediction equations.
How accurate is the 1919 Harris-Benedict equation?
The original 1919 equation tends to slightly overestimate resting energy needs compared to more modern equations like Mifflin-St Jeor, largely because it was derived from a smaller, less diverse study population. It remains useful for historical comparison and some legacy clinical contexts, but the [BMR Calculator](/bmr-calculator/) using Mifflin-St Jeor is generally considered more accurate for typical adults today.
Can I use BEE to plan weight loss or gain?
BEE alone only tells you your resting energy burn, not your total daily need, so it's not a direct calorie target on its own. Combine it with an activity multiplier, as the [Harris-Benedict Calculator](/harris-benedict-calculator/) or [TDEE Calculator](/tdee-calculator/) does, before subtracting or adding calories for weight change goals.
What is the difference between kcal and kJ in my results?
Kilocalories (kcal) are the standard US and nutrition-label unit, while kilojoules (kJ) are commonly used in some countries' nutrition labeling and scientific contexts. This calculator converts your BEE to kJ automatically using the standard factor of 1 kcal = 4.184 kJ.
Should men and women expect different BEE results?
Yes, the original Harris-Benedict equation uses separate coefficients for men and women, reflecting average differences in lean body mass and metabolic rate between sexes at the same weight, height, and age. This is why the calculator asks for sex as a required input.
Also known as
basal energy expenditureBEE calculatororiginal Harris-Benedict equation1919 Harris-Benedict formularesting energy expenditure