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The form keeps a single-page layout, while inputs automatically shift to three columns on large screens, two on medium screens, and one on mobile.
Example Data Table
| Profile | Basis Method | Protein Target | Net Carbs | Estimated Fat | Calorie Target |
|---|---|---|---|---|---|
| Fat loss, moderate activity | Lean Body Mass | 118 g/day | 25 g/day | 129 g/day | 1,720 kcal |
| Maintenance, light activity | Current Weight | 124 g/day | 30 g/day | 138 g/day | 1,920 kcal |
| Muscle gain, high activity | Target Weight | 156 g/day | 35 g/day | 167 g/day | 2,360 kcal |
| Therapeutic keto, sedentary | Lean Body Mass | 78 g/day | 20 g/day | 122 g/day | 1,400 kcal |
Formula Used
1. Lean body mass: Lean Body Mass = Current Weight × (1 − Body Fat % / 100).
2. Protein target: Daily Protein = Basis Weight × Protein Multiplier. The basis can be lean mass, current weight, or target weight.
3. Protein range: Suggested Range = Basis Weight × (Multiplier − 0.20) to Basis Weight × (Multiplier + 0.20).
4. Energy estimate: BMR uses Katch-McArdle when body fat is supplied. Otherwise, it uses Mifflin-St Jeor.
5. Fat allowance: Fat Grams = (Calorie Target − Protein Calories − Carb Calories) ÷ 9.
6. Macro percentages: Protein and carbs use 4 kcal per gram, while fat uses 9 kcal per gram.
How to Use This Calculator
Choose your preferred unit system first, then enter age, sex, body size, and body fat percentage. Body fat helps the calculator estimate lean mass more accurately.
Select your keto goal and activity level. Then choose whether protein should be based on lean mass, current weight, or target weight.
Set a daily net carb limit and the number of meals you usually eat. Add a custom calorie target only if you already follow a specific intake plan.
Press Calculate Protein. The result appears above the form under the header, showing protein grams, suggested range, per-meal amount, calories, and fat grams.
Use the CSV and PDF buttons to save either your calculated results or the example table for later review, coaching notes, or meal planning records.
FAQs
1. Why does keto still require enough protein?
Protein supports muscle retention, recovery, enzymes, hormones, and satiety. Keto lowers carbohydrates, but it does not remove the body’s ongoing need for amino acids every day.
2. Which protein basis method is usually best?
Lean body mass is often the most precise choice when body fat is known. Current weight is simpler, while target weight can be helpful during structured fat-loss or muscle-gain phases.
3. Will higher protein stop ketosis?
For many people, a sensible protein intake does not automatically stop ketosis. Total energy, carb intake, training load, and individual response matter more than isolated fear of protein.
4. What net carb limit should I enter?
Many ketogenic plans start near 20 to 30 grams of net carbs daily. Your best number may vary with activity, medication use, and tolerance, so personal monitoring matters.
5. Why does the calculator estimate fat grams too?
Protein targets work best inside a full macro plan. Once calories, protein, and carbs are set, remaining calories usually come from dietary fat on keto.
6. Should athletes use more protein on keto?
Often yes. Hard training raises repair and recovery demands, so active people commonly need the upper end of keto protein ranges, especially during intense blocks.
7. Can I use this during fat loss?
Yes. The calculator increases protein emphasis for fat-loss goals to help protect lean tissue, improve fullness, and keep the diet more sustainable during a calorie deficit.
8. Is this calculator medical advice?
No. It is an educational planning tool. People with kidney disease, diabetes, pregnancy, therapeutic keto prescriptions, or special medical needs should seek qualified professional guidance.