If your goal is fat loss while preserving muscle, the Ketogains approach can be more useful than a generic keto macro split. Use the calculator below to estimate calories, protein, net carbs, and fat based on lean body mass and activity level.
Ketogains Macro Calculator
What Is a Ketogains Calculator?
A Ketogains calculator estimates your daily macros using a keto-first, muscle-preserving framework. Unlike many keto calculators that set protein too low, Ketogains-style planning gives protein priority, keeps carbs low, and adjusts fat according to your calorie target.
In practical terms, you get a macro setup that can help you lose fat without sacrificing performance in the gym. This is especially useful if you lift weights, do resistance training, or simply want to maintain lean mass during a cut.
How This Calculator Estimates Your Macros
1) Lean Body Mass (LBM)
We estimate lean body mass from your total weight and body-fat percentage:
- LBM = Body Weight × (1 − Body Fat %)
LBM is central because protein needs scale better with lean tissue than with total body weight.
2) Basal Metabolic Rate (BMR)
This page uses the Katch-McArdle equation, which works well when body fat is known:
- BMR = 370 + (21.6 × LBM in kg)
3) Total Daily Energy Expenditure (TDEE)
We multiply BMR by your selected activity factor to estimate your maintenance calories:
- TDEE = BMR × Activity Multiplier
4) Goal Adjustment
Your calorie target is adjusted according to your goal:
- Cut: ~20% below TDEE
- Maintenance: near TDEE
- Lean gain: ~10% above TDEE
5) Macro Distribution
Protein is set from LBM, carbs come from your selected net-carb target, and fat fills the remaining calories. This gives the core Ketogains logic:
- Protein first for muscle retention
- Carbs controlled for ketosis and blood-glucose stability
- Fat adjusted to match total calories
How to Use Your Numbers in Real Life
- Track your food for at least 2 weeks before making major changes.
- Hit protein daily even if calories vary a bit.
- Keep net carbs near your target and prioritize whole foods.
- Adjust fat intake up or down to match your calorie goal.
- Recalculate after noticeable weight or body-fat changes.
Example: Ketogains-Style Daily Setup
Imagine someone at 80 kg body weight and 25% body fat, moderately active, cutting. Their output might show:
- Calories around 1,900–2,100 kcal
- Protein around 125–145 g
- Net carbs around 20–30 g
- Fat adjusted to fill remaining calories
The exact numbers vary by activity and body-fat estimate, but the structure stays consistent.
Common Mistakes to Avoid
Eating “keto” but under-eating protein
Many people treat keto as high-fat only. If your goal includes body composition, protein should not be neglected.
Ignoring electrolytes
Low-carb diets increase water and electrolyte loss. Consider sodium, potassium, and magnesium intake, especially during adaptation.
Changing macros too often
Daily scale fluctuations are normal. Use weekly averages and trend data before adjusting calories.
Forgetting training quality
A good macro plan works best when paired with progressive strength training, sleep, and stress management.
When to Recalculate
Re-run the calculator when one of the following changes:
- Your body weight changes by ~3–5 kg (or 7–10 lb)
- Your body-fat estimate changes materially
- Your activity level shifts (new job, training block, sports season)
- Your goal changes from cut to maintenance or lean gain
Final Notes
This calculator is an estimate, not a medical diagnosis. Use it as a starting framework, then refine based on energy, gym performance, body measurements, and progress photos over time. Consistency beats perfection.