Calculating Calories Provided by Nutrition
Enteral formula feeds
- Calculate total intake (e.g. ml’s per hour x 24). This gives you total mLs.
- Divide total intake by 30 mL’s per ounce. This gives you total ounces in.
- Multiply total ounces in by number of calories per ounce. Infant formulas are usually 20 kcal/oz, but these are often fortified to 22, 24, or 30 kcal/oz. This gives you total calories per day.
- Divide by weight in kg. This gives you kcal/kg/day.
4.5 kg infant receiving 28 ml/hr of 24 kcal/oz Similac by ND tube.
28 ml/hr x 24 hrs / 30 ml/oz x 24 kcal/oz / 4.5 kg = 120 kcal/kg/day
TPN and Lipids
|% w/v (g/100 mL)||Kcal/mL|
|Glucose (3.4 kcal/g)||5.0||0.17|
- Glucose (3.4 kcal/g)
- Using the table above, determine the kcal/mL in the TPN solution you are using.
- Multiply kcal/mL of TPN by the volume infused in 24 hours to calculate total glucose kcals.
- Divide total kcal per day by the patient’s weight in kg to get glucose kcal/kg/day.
- Protein (4 kcal/g)
- Multiply the g/kg/day of protein by 3.4 kcal/g to get protein kcal/kg/day.
- Lipids (10 kcal/g in 20% lipids)
- Multiply the volume of lipids in 24 hours by 2.0 Kcal/mL to get total lipid kcals.
- Divide total lipid kcals by the patient’s weight to get total lipid kcal/kg/day.
- Add kcal/kg/day provided by glucose, protein, and lipids to get total kcal/kg/day.