Macro Calculator for Weight Loss
Estimate a calorie target and grams of protein, carbs and fat for a weight-loss plan that avoids aggressive deficit defaults.
Last updated: June 3, 2026
Method
How this macro calculator works
The calculator estimates resting energy with the Mifflin-St Jeor equation, applies an activity multiplier, then adjusts calories for the selected goal pace. Macro grams are derived from calorie shares.
Estimate resting energy from age, height, weight and metabolic profile.
Apply an activity multiplier to estimate daily energy needs.
Use a conservative calorie deficit for weight loss, with a floor to avoid very low targets.
Split calories into protein, carbohydrates and fat based on the chosen macro mode.
Use the result
The target is only the starting point
Macro math gives you a daily target. Eatibo helps with the harder part: turning actual meals into logged calories, protein, carbs and fat without manual entry.
- Scan meals to estimate calories and macros
- Spot protein, carb and fat gaps across the day
- Keep weight goals connected to real food records
Limits
Helpful estimate, clear boundary.
This is an estimate for adults, not a clinical diet plan.
Do not use this for eating disorder recovery, pregnancy, children, medical nutrition therapy or clinician-directed calorie targets.
Prediction equations vary across individuals. Real progress, hunger, training and lab markers may require professional adjustment.
FAQ
Quick answers about macro calculator for weight loss.
How do I calculate macros for weight loss?
Estimate your daily calorie needs, choose a modest deficit, then split the target into grams of protein, carbs and fat. This tool does that math and shows the assumptions.
What macro split is best for weight loss?
There is no single best split. A balanced plan, a higher-protein plan or a lower-carb plan can all work if the calorie target is realistic and you can keep it consistently.
How much protein should I eat while losing weight?
Many weight-loss macro plans use a higher protein share to support satiety and lean mass, but personal needs vary. Use the result as a starting estimate, not a prescription.
Why does this calculator avoid aggressive calorie deficits?
Very low targets can be hard to sustain and may be inappropriate for many people. This calculator applies a conservative floor and encourages professional guidance for medical cases.
Can Eatibo track these macros automatically?
Eatibo can estimate calories, protein, carbs and fat from scanned meals and labels, then keep those logs connected to your daily goals.
Is this macro calculator for children or pregnancy?
No. Children, pregnancy, eating disorder recovery and clinical diets require individualized professional guidance.