- Enter the patient's age, sex, weight (kg), and height (cm or inches).
- Select the patient's activity level to calculate total daily energy expenditure (TDEE).
- The Mifflin-St Jeor BMR, Harris-Benedict BEE (original and revised), TDEE, and CKD/dialysis energy targets update automatically.
- For obese patients, consider using adjusted body weight = IBW + 0.25 × (actual – IBW).
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When to Use
Use this calculator for nutritional assessment of adult patients needing caloric targets — particularly those with CKD, ESRD on hemodialysis (HD) or peritoneal dialysis (PD), renal transplant recipients, and patients being considered for enteral or parenteral nutrition support.
Three Validated BEE/BMR Equations
Harris-Benedict (original, 1919):
Male: BEE = 66.5 + (13.75 × W) + (5.003 × H) – (6.755 × A)
Female: BEE = 655.1 + (9.563 × W) + (1.850 × H) – (4.676 × A)
Harris-Benedict (revised, Roza & Shizgal 1984):
Male: BEE = 88.362 + (13.397 × W) + (4.799 × H) – (5.677 × A)
Female: BEE = 447.593 + (9.247 × W) + (3.098 × H) – (4.330 × A)
Mifflin-St Jeor (1990, considered most accurate for most adults):
Male: BMR = (10 × W) + (6.25 × H) – (5 × A) + 5
Female: BMR = (10 × W) + (6.25 × H) – (5 × A) – 161
Where W = weight (kg), H = height (cm), A = age (years)
Activity Multipliers (Harris-Benedict)
| Activity Level | Multiplier |
|---|---|
| Sedentary (little/no exercise) | × 1.2 |
| Lightly active (1–3 days/week) | × 1.375 |
| Moderately active (3–5 days/week) | × 1.55 |
| Very active (6–7 days/week) | × 1.725 |
| Extra active (very hard exercise, physical job) | × 1.9 |
CKD/Dialysis Energy Targets (KDOQI 2020)
| Population | Target |
|---|---|
| Non-dialysis CKD | 30–35 kcal/kg IBW/day |
| Hemodialysis | 30–35 kcal/kg IBW/day (up to 35–40 for malnourished patients) |
| Peritoneal dialysis | 30–35 kcal/kg/day minus glucose absorbed from dialysate (~60–80% of dialysate glucose) |
| CKD + obesity | Use adjusted BW = IBW + 0.25 × (actual BW – IBW) |
Appropriate population
Adults ≥18 years undergoing nutritional assessment. Particularly useful for pre-dialysis CKD, HD, PD, and transplant patients. Also applicable for estimating caloric targets for enteral or parenteral nutrition, and weight management in CKD.
Pearls & Pitfalls
Choosing the right equation
Mifflin-St Jeor is preferred in most clinical settings for accuracy in healthy and overweight adults. All equations use actual body weight — in obesity, consider adjusted body weight = IBW + 0.25 × (actual – IBW) to avoid overestimating needs. BEE ≠ total caloric needs; always multiply by the appropriate activity factor for daily energy needs.
Dialysis-specific considerations
Dialysis patients have higher protein requirements (1.2–1.4 g/kg/day for HD; 1.2–1.5 g/kg/day for PD) but similar energy targets. For PD patients, remember to account for glucose absorbed from the dialysate — subtract approximately 60–80% of the glucose content of each dialysate exchange from the daily caloric target.
Limitations
(1) BEE equations are estimates based on population averages — actual metabolic rate may vary significantly with acute illness, systemic inflammation, or dialysis. (2) Indirect calorimetry remains the gold standard when available. (3) These equations were derived in predominantly non-CKD populations; local validation in Filipino CKD cohorts is limited. Always integrate with clinical judgment and dietitian input.
Why Use It
Malnutrition is highly prevalent in CKD and ESRD and independently predicts mortality, hospitalization, and cardiovascular events. Protein-energy wasting (PEW) affects up to 40% of maintenance dialysis patients. Accurate energy estimation is the first step in nutritional rehabilitation — knowing the target allows clinicians and dietitians to assess intake adequacy, design supplementation plans, and monitor response.
While indirect calorimetry is the gold standard, it is not routinely available in most Philippine nephrology settings. Validated predictive equations (Mifflin-St Jeor, Harris-Benedict) provide a practical bedside alternative that, when paired with KDOQI 2020 weight-based targets, gives a clinically actionable caloric prescription.
Basal Energy Expenditure — Harris-Benedict & Mifflin-St Jeor
Enter the patient's age, sex, weight, height, and activity level. Results update automatically.
⚕ BEE equations are estimates based on population averages. Actual metabolic rate may vary with illness, inflammation, or dialysis. For obese patients, consider adjusted body weight. Indirect calorimetry is the gold standard. CKD energy targets follow KDOQI 2020 guidelines. For educational reference only.
Next Steps
Use the calculated BEE/BMR and TDEE to guide nutritional counseling and monitoring.
- Compare calculated BEE to actual dietary intake via 24-hour dietary recall or food frequency questionnaire.
- For HD patients: refer to renal dietitian for comprehensive Protein Nitrogen Appearance (PNA) and Subjective Global Assessment (SGA).
- Consider supplemental oral nutrition if intake consistently <80% of BEE × activity factor.
- For PD patients: subtract estimated dialysate glucose absorption (~60–80% of glucose in each exchange) from the daily caloric target.
- Reassess energy needs every 3–6 months or with significant weight change, change in dialysis modality, or acute illness.
- In CKD + obesity: calculate adjusted body weight = IBW + 0.25 × (actual BW – IBW) and use that for KDOQI-based targets.
Evidence & References
Equation Comparison
| Equation | Year | Notes |
|---|---|---|
| Harris-Benedict (original) | 1919 | Derived from healthy young adults; tends to overestimate in obese patients |
| Harris-Benedict (revised, Roza & Shizgal) | 1984 | Slightly better accuracy; corrects systematic bias of original |
| Mifflin-St Jeor | 1990 | Preferred by AND/ASPEN for most adults; best validated in overweight/obese populations |
References
- Harris JA, Benedict FG. A biometric study of human basal metabolism. Proc Natl Acad Sci. 1918;4(12):370–373.
- Roza AM, Shizgal HM. The Harris Benedict equation reevaluated: resting energy requirements and the body cell mass. Am J Clin Nutr. 1984;40(1):168–182.
- Mifflin MD, St Jeor ST, Hill LA, et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990;51(2):241–247.
- Ikizler TA, Burrowes JD, Byham-Gray LD, et al. KDOQI Clinical Practice Guideline for Nutrition in CKD: 2020 Update. Am J Kidney Dis. 2020;76(3)(Suppl 1):S1–S107.
