NutritionFeb 5, 2026 8 min read
Protein and Longevity: Building a Body That Lasts
New research links lifelong protein adequacy to muscle preservation, immune function and graceful aging.
By Elements84 Medical Editorial Team
Read Nutrition · Macronutrients
Macro Calculator
Balance protein, carbs and fats for your goals.
Your details
Preset
Your daily target
2000kcal/day
Protein
g
kcal
Carbs
g
kcal
Fat
g
kcal
What are macros?
Protein, carbohydrates and fat supply your calories. Each does a different job: protein builds, carbs fuel, fat regulates.
How to use this calculator
Take your daily calorie target, pick a preset that matches your goal, and we'll convert percentages into grams.
Energy per gram
Protein 4 kcal/g · Carbs 4 kcal/g · Fat 9 kcal/g
Category reference
| Category | Range |
|---|---|
| Balanced | P 30 / C 40 / F 30 |
| Low-carb | P 35 / C 25 / F 40 |
| Ketogenic | P 25 / C 5 / F 70 |
| High-protein | P 40 / C 35 / F 25 |
| Endurance | P 20 / C 55 / F 25 |
Limitations & caveats
- Match real intake within ±10% on most days.
- Quality matters: whole foods, fibre, minimally processed.
- Athletes may need higher protein than presets show.
- Keto requires electrolyte management.
- Children/pregnancy need bespoke guidance.
FAQ
Frequently asked questions
Related tools
Keep exploring
Read more
Read up on the science
Nutrition
NutritionFeb 2, 2026 7 min read
Carbs, Protein, Fat: Finding the Macro Ratio That Fits Your Life
The optimal macro split is not the one in the magazine. It is the one you can stick to for a year.
By Elements84 Medical Editorial Team
Read 
NutritionJan 28, 2026 5 min read
Fibre: The Forgotten Macro With Outsized Returns
Fibre does not get marketed. It is barely on food labels. Yet 30 g/day is one of the single best-evidenced nutrition targets of the last 30 years.
By Elements84 Medical Editorial Team
Read 
Kidney Function & ElectrolytesJul 20, 2026 9 min read
Creatinine and eGFR: What These Kidney Function Results Mean Together
Understand what creatinine and estimated GFR (eGFR) measure, why eGFR is a calculated estimate rather than a direct measurement, and why one result cannot diagnose chronic kidney disease on its own.
By Elements84 Editorial Team
Read Medical Evidence
How we ground the Macro
Grade B · Observational studiesLast reviewed Nov 1, 2025
Named clinical guidelines
- Acceptable Macronutrient Distribution Ranges (US NAM)
- ISSN protein position stand