Harris-Benedict Calculator
Calculate BMR using the revised Harris-Benedict equation with clinical stress factors for hospitalized patients. Includes protein recommendations.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Basal Metabolic Rate (kcal/day)
1,672
How to Use This Calculator
- Enter the patient's weight in kg and height in cm.
- Enter age in years and select sex.
- Select an activity or stress factor appropriate for the patient's condition.
- The calculator returns the Basal Metabolic Rate (BMR) and Total Energy Expenditure (TEE).
- Use TEE as a starting point for caloric prescription, then adjust based on clinical response.
How the result changes with Weight (kg)
| Weight (kg) | Basal Metabolic Rate (kcal/day) |
|---|---|
| 53 | 1,444 |
| 136 | 2,556 |
| 235 | 3,882 |
| 317 | 4,981 |
What each input means
- Weight (kg)
- Body weight in kilograms.
- Height (cm)
- Height in centimeters.
- Age (years)
- Age in years.
- Sex (0 = Female, 1 = Male)
- Biological sex: 0 for female, 1 for male.
- Activity level (1-5)
- 1 = Sedentary, 2 = Lightly active, 3 = Moderately active, 4 = Active, 5 = Very active.
- Clinical stress factor
- 1.0 = none, 1.2 = minor surgery, 1.35 = trauma, 1.5 = sepsis, 1.75 = major burns.
What each result means
- Basal Metabolic Rate (kcal/day)
- BMR from the revised Harris-Benedict equation.
- Total Daily Energy Expenditure (kcal/day)
- BMR × activity factor for healthy individuals.
- Clinical energy needs (kcal/day)
- BMR × stress factor for hospitalized patients.
- Stress multiplier
- Clinical stress/injury factor used.
- Protein — low range (g/day)
- Lower end of protein recommendation.
- Protein — high range (g/day)
- Upper end of protein recommendation.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersWeight (kg) = 70, Height (cm) = 170, Age (years) = 30, Sex (0 = Female, 1 = Male) = 1 = 6 input(s) provided
- Calculate Basal Metabolic RateBasal Metabolic Rate1672 = 1672
- Calculate Total Daily Energy ExpenditureTotal Daily Energy Expenditure = bmr * af2006 = 2006
- Calculate Clinical energy needsClinical energy needs = bmr * stressFactor1672 = 1672
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