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Total Parenteral Nutrition (TPN) Calculator

This calculator helps determine the total nutritional needs of patients requiring parenteral (IV) nutrition. It estimates Basal Energy Expenditure (BEE), Ideal Body Weight (IBW), macronutrient distribution (lipids, dextrose, protein), nitrogen balance, and the non-protein calorie-to-nitrogen ratio.

TPN Requirements and Nutritional Breakdown Estimator

Input Fields
a
years
Patient age
h
cm
Patient height in centimeters
w
kg
Patient weight in kilograms
lv
mL
Volume of lipid solution in mL
If enabled, the result will update automatically when you change any value.

TPN Nutritional Calculation Formulas

Formula
$$\text{BEE (Men)} = 66.5 + (13.75 \cdot W) + (5.003 \cdot H) – (6.775 \cdot A) \\ \text{BEE (Women)} = 655.1 + (9.563 \cdot W) + (1.850 \cdot H) – (4.676 \cdot A) \\[10pt] \text{IBW (Men)} = 50 + 2.3 \cdot (\text{Height in inches} – 60) \\ \text{IBW (Women)} = 45.5 + 2.3 \cdot (\text{Height in inches} – 60) \\[10pt] \text{Calories from Lipid} = \text{Lipid Volume (mL)} \cdot 10 \\ \text{Calories from Dextrose} = \text{Dextrose g} \cdot 3.4 \\ \text{Nitrogen (g)} = \frac{\text{Protein (g)}}{6.25} \\[10pt] \text{Non-protein Calories to Nitrogen Ratio} = \frac{\text{Calories from Dextrose + Lipid}}{\text{Nitrogen (g)}}$$


Total Parenteral Nutrition (TPN) is a method of feeding that bypasses the gastrointestinal tract. This calculator helps clinicians determine precise nutritional support for patients by estimating energy needs (BEE), ideal weight, and appropriate macronutrient allocation. It also includes nitrogen balance analysis, which is critical in assessing protein adequacy and ensuring optimal metabolic support in critically ill or malnourished patients.

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