A dietitian’s cheat sheet for calculating estimated needs

It can be tough to remember all the calculations for estimated needs across different patient populations. Acute and chronic disease states impact the body differently and often require variation in calorie, protein, and fluid needs. Various assessment methods exist, such as indirect calorimetry, predictive equations for calorie needs, or nitrogen balance studies for protein needs.  

Additionally, registered dietitians can estimate needs with the use of simple kilocalorie (kcal), gram (g), or milliliter (mL) per kilogram (kg) calculations. At Dietitians On Demand, we have you covered with this updated cheat sheet for calculating needs for adults with various conditions. 

Note: These are general recommendations and guidance. Use clinical judgment to adjust recommendations for individual patients, especially considering chronic comorbidities, multiple acute conditions, and nutrition status. Use standard fluid calculations unless otherwise noted.

Acronyms: REE (resting energy expenditure); EER (estimated energy requirement); BEE (basal energy expenditure); TEE (total energy expenditure); RDA (recommended dietary allowance); AI (adequate intake) 

Acute kidney injury (AKI)

Calories: 20 to 30 kcal/kg (100% to 130% REE)

Protein: 

• 0.8 to 1 g/kg if not receiving dialysis and non-catabolic 
• 1 to 1.5 g/kg if receiving dialysis and/or catabolic 
• 1.7-2 g/kg or up to 2.5 g/kg if critically ill and receiving continuous renal replacement therapy (CRRT) 
• Avoid protein restriction with AKI to prevent/delay dialysis 

Fluid: 

• Individualized 
• Consider fluid restriction with anuria or oliguria; no fluid restriction with CRRT 

Acute Pancreatitis

• Calories: Indirect calorimetry if available, or 25 to 35 kcal/kg 
• Protein: 1.2 to 1.5 g/kg, or up to 2 g/kg for severe cases (critical illness) 

Breastfeeding

Calories:

• 0-6 months exclusively breastfeeding  
  • TEE (based on age and activity level) + 540 (for energy for milk production) – 140 (for energy mobilization) 
• 7-12 months partial breastfeeding 
  • TEE (based on age and activity level) + 380 (for energy for milk production) 

Protein: Consider RDA of 71 g/day

Fluid: Consider AI of 3.8 liters/day (16 cups/day)

Burns

Calories: Indirect calorimetry, if available, repeated weekly

Protein:

• 1.5 to 2 g/kg for >20% total body surface area burns 
• May require up to 3 to 4 g/kg for larger total body surface area burns 

Fluid: Often requires close intake/output monitoring

Cancer

Calories:

• Indirect calorimetry, if available 
• Inactive/non-stressed: 25 to 30 kcal/kg 
• Weight gain/repletion: 30 to 35 kcal/kg 
• Hypermetabolic/stressed: 35 kcal/kg 

Protein:

• 1-1.5 g/kg 
• For cancer cachexia, consider 1.5 to 2 g/kg 

Chronic kidney disease

Calories:

• Stage 3 to 5D, hemodialysis or peritoneal dialysis: 25 to 35 kcal/kg 
• Kidney transplant, acute: 30 to 35 kcal/kg or BEE x 1.3 to 1.5 
• Kidney transplant, chronic: 25 to 30 kcal/kg 

Protein:

• Stage 3 to 5: 
  • Very low protein diet: 0.28 to 0.43 g/kg + keto acid analogs 
  • Low protein diet: 0.55 to 0.6 g/kg 
  • If comorbidity of diabetes, then low protein diet: 0.6 to 0.8 g/kg 
• Stage 5D on hemodialysis or peritoneal dialysis: 1 to 1.2 g/kg 
  • Adjust protein provision based on metabolic stability  
• Kidney transplant, acute: 1.2 to 2 g/kg 
• Kidney transplant, chronic: 0.6 to 0.8 g/kg (without diabetes); 0.8 to 0.9 g/kg (with diabetes) 

Fluid:

• Stage 1 to 4: Individualized based on comorbidities, physical findings, and alterations in urine output 
• Stage 5D, hemodialysis: Consider urine output 
  • ≥ 1 L fluid output: 2,000 mL/day 
  • < 1 L fluid output: 1,000 to 1,500 mL/day 
  • Oliguria: 24-hour urine volume + 750 mL/day 
• Stage 5D, peritoneal dialysis: Individualized to maintain fluid balance 
  • 1,000 to 3,000 mL/day 
• Kidney transplant (acute or chronic): Generally unrestricted unless graft dysfunction 

Chronic Obstructive Pulmonary Disease 

Calories: Individualized for optimal weight; consider 30 kcal/kg for patients without obesity

Protein: Increase from baseline if needed for malnutrition and/or catabolic state; consider 1-1.5 g/kg

Cirrhosis

Calories: 30-35 kcal/kg, monitor need for an estimated dry weight 

• Liver transplant, acute: 30-35 kcal/kg 
• Liver transplant, chronic: BEE x1-1.3 dependent on weight maintenance or loss 

Protein: 1 to 1.5 g/kg; up to 2 g/kg with critical illness 

• Liver transplant, acute: 1.5 to 2 g/kg  
• Liver transplant, chronic: 0.8 to 1 g/kg 

Fluid: Restriction may be necessary if patient with hypervolemic hyponatremia 

• Liver transplant, acute and chronic: 30 to 35 mL/kg  

Critical Illness

Calories: Indirect calorimetry if available/appropriate

• BMI <30 kg/m2: 12-25 kcal/kg for first 7-10 days in ICU, or consider Penn State equation if appropriate 
• BMI 30 to 50 kg/m2: 11 to 14 kcal/kg of actual weight 
• BMI >50 kg/m2: 22 to 25 kcal/kg of ideal weight 

Protein:

• BMI <30 kg/m2: 1.2 to 2 g/kg 
• BMI 30 to 39.9 kg/m2:  2 g/kg of ideal weight 
• BMI >40 kg/m2: 2.5 g/kg of ideal weight 

Pregnancy

Calories:

• First trimester: Nonpregnant EER  
• Second and third trimesters: TEE (based on activity level) + energy deposition/mobilization (based on pre-pregnancy BMI) 
  • Underweight BMI = +300 kcal/day 
  • Normal weight BMI = +200 kcal/day 
  • Overweight BMI = +150 kcal/day 
  • Obese BMI = -50 kcal/day 

Protein: Consider RDA of 71 g/day, adjust as needed for appropriate percentage of calories from protein (if patient with increased kcal needs)

Pressure injuries

Calories: 30 to 35 kcal/kg

Protein: 1.2 to 1.5 g/kg; up to 2 g/kg for stage 3-4 or for increased wound size(s)

Fluid: Individualize; Consider 30 mL/kg or 1 to 1.5 mL/kcal for chronic wounds

Trauma

Calories: 20 to 35 kcal/kg, depending on stage of trauma

Protein: 1.2 to 2g/kg, possibly higher in multitrauma patients

Updated August 2025.

---

Dietitians On Demand is the nationwide leader in staffing registered dietitians, specializing in short-term, temporary, and permanent-hire positions in acute care, long-term care, and food service. Our dietitians cover a vacancy, maternity leave, vacations, FMLA, or increases in census. Check out our job openings, or request your coverage today!

---

References:

Gonyea J, Phillips S (eds). Clinical Guide to Nutrition Care in Kidney Disease. 3rd ed. Academy of Nutrition and Dietetics; 2023. 

Academy of Nutrition and Dietetics. Nutrition Care Manual. https://www.nutritioncaremanual.org/. Accessed March 20, 2025. 

National Academies of Sciences, Engineering, and Medicine. 2023. Dietary Reference Intakes for Energy. Washington, DC: The National Academies Press. https://doi.org/10.17226/26818.  

Dietary Guidelines for Americans 2020 – 2025. Make Every Bite Count with Dietary Guidelines. https://www.dietaryguidelines.gov/sites/default/files/2021-03/Dietary_Guidelines_for_Americans-2020-2025.pdf. Accessed May 29, 2025. 

Mueller C (ed). The ASPEN Adult Nutrition Support Core Curriculum. 3rd ed. American Society of Parenteral and Enteral Nutrition; 2017. 

Voss A, Williams V (eds). Oncology Nutrition for Clinical Practice. 2nd ed. Academy of Nutrition and Dietetics; 2021. 

Collins P, Yang I, Chang YC, Vaughan A. Nutritional support in chronic obstructive pulmonary disease. (COPD): an evidence update. J Thorac Dis. 2019;11(Suppl 17):S2230-S2237. doi: 10.21037/jtd.2019.10.41 

Hanson C, Bowser E, Frankenfield D, Piemonte T. Chronic obstructive pulmonary disease: a 2019 evidence analysis center evidence-based practice guideline. J Acad Nutr Diet. 2021;121(1):139-165.e15. doi: 10.1016/j.jand.2019.12.001  

Matarese L, Mullin G, Tappenden K (eds). Health Professional’s Guide to Gastrointestinal Nutrition. 2nd ed. Academy of Nutrition and Dietetics; 2023. 

McClave SA, Taylor BE, Martindale, RG, et al. Guidelines for the Provision and Assessment of Nutrition Support Therapy in the Adult Critically Ill Patient: Society of Critical Care Medicine (SCCM) and American Society for Parenteral and Enteral Nutrition (A.S.P.E.N.) J Parenter Enteral Nutr. 2016;40(2):159-211.   

Compher C, Bingham AL, McCall M, et al. Guidelines for the provision of nutrition support therapy in the adult critically ill patient: The American Society for Parenteral and Enteral Nutrition. J Parenter Enteral Nutr. 2022;46:12–41.