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TPN Calculator 2026
Dextrose, amino acid and lipid grams per day — and total parenteral calories.
A TPN (total parenteral nutrition) calculator is a clinical estimation tool that converts intravenous infusion rates and concentrations into grams delivered per day and total calories. Standard energy factors are dextrose 3.4 kcal per gram, amino acids 4 kcal per gram, and a 20% lipid emulsion at about 2 kcal per mL (about 10 kcal per gram of lipid). IMPORTANT: This tool is for education and quick estimation only and is not a substitute for clinical judgement, pharmacy verification or institutional protocol — every TPN prescription must be checked by the responsible clinical team.
Start Calculating ↓TPN calories per day
About the TPN Calculator
Enter the patient's weight and each component's concentration and rate. Daily volume is rate × 24 hours, grams are volume × concentration ÷ 100, and calories use the factors above (lipid calories = mL per day of 20% emulsion × 2). The result includes total kcal and kcal per kg for comparison with the prescribed target.
TPN Calculator: Key Facts to Know
- ✓ Dextrose monohydrate provides 3.4 kcal per gram in parenteral nutrition.
- ✓ Amino acids provide 4 kcal per gram and also define the daily protein dose in g/kg.
- ✓ A 20% lipid emulsion provides about 2 kcal per mL (roughly 10 kcal per gram of lipid).
- ✓ Formula used: total kcal = dextrose g × 3.4 + amino acid g × 4 + lipid mL (20%) × 2.
- ✓ Educational only — verify all calculations with pharmacy and local protocol before any clinical use.
Results from the TPN Calculator are estimates for general educational use on Smoothie Nutrition Calculator. They are not medical or dietetic advice — for personal medical nutrition questions, including pregnancy, diabetes and clinical nutrition such as TPN, always work with your doctor or a registered dietitian.
Frequently Asked Questions
Multiply dextrose grams per day by 3.4, amino acid grams per day by 4, and millilitres per day of 20% lipid emulsion by 2, then add the three together.
TPN Calculator Guides & Articles
All 4 of our guides for this calculator — every one built on the same data as the tool above.
TPN Calculator 2026
A TPN (total parenteral nutrition) calculator is a clinical estimation tool that converts intravenous infusion rates and concentrations into grams delivered per day and total calories. Standard energy factors are dextrose 3.4 kcal per gram, amino acids 4 kcal per gram, and a 20% lipid emulsion at about 2 kcal per mL (about 10 kcal per gram of lipid). IMPORTANT: This tool is for education and quick estimation only and is not a substitute for clinical judgement, pharmacy verification or institutional protocol — every TPN prescription must be checked by the responsible clinical team.
Read guide →
💉TPN Calculator 2026 | Tips Mistakes
Most wrong results from the TPN Calculator come from input mistakes, not the maths. Here are the five that matter most — and the fix for each.
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💉TPN Calculator 2026 | Deep Dive
Beyond the basics: the reference values, assumptions and limits behind the TPN Calculator, and how dietitians sanity-check its results.
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💉TPN Calculator 2026 | Worked Examples
Numbers land differently in context. Three everyday scenarios run through the TPN Calculator, with the input that mattered most in each.
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