What macro split is best for fat loss?

A higher-protein split (often around 30–35%+ of calories from protein) with enough carbs to train hard works well for many people. Exact percentages matter less than a consistent calorie deficit and protein intake.

How much protein should I eat per day?

A practical range for active adults is about 1.6–2.2 g per kg body weight. Higher intakes can help during aggressive cuts; lower intakes may suit sedentary maintenance if overall diet quality is high.

Do I need to hit macros exactly every day?

No. Weekly averages matter more. Prioritize protein consistency; let carbs and fats flex around training days if that helps adherence.

Are low-carb or low-fat macros better?

Both can work if calories and protein are controlled. Choose the pattern you can sustain. Athletes doing high-volume training often feel better with more carbohydrates.

Can I use this macro calculator for bulking?

Yes—select a gain goal for a calorie surplus and a carb-forward split. Keep the surplus modest to limit excess fat gain, and train progressively.

Should beginners track macros?

Beginners can start with protein + calorie awareness, then add full macro tracking if progress stalls or they enjoy the structure. Tracking is a tool, not a moral requirement.

Nutrition Programming

Free Macro Calculator
Protein, carbs & fats by goal

100% Free. Plan nutrition with precise daily macronutrient targets. Calculate calories, protein, carbs, and fats tailored to your activity level and goal—whether cutting, maintaining, or bulking.

✓ Goal-specific macro targets

✓ Calorie & protein prioritization

✓ Metric and imperial support

After this result, continue with BMI, Body Fat, BMR, or another tool above.

Measurement units

Macro Calculator

Daily protein, carbs, and fats from Mifflin–St Jeor calories and your goal.

Gender *

Age *

Weight *

Height *

Goal

Activity Level

Macro targets are estimates. Pair them with structured training, sleep hygiene, and regular assessments for best results.

Why use this calculator

Practical guidance designed to work alongside your BMI results

Complete Macro Breakdown

Generate daily calorie, protein, carbohydrate, and fat targets customized to your stats and training volume. The calculator automatically adjusts macros for weight loss, maintenance, or muscle gain.

Evidence-Based Ratios

We default to the 30/40/30 macronutrient split because it balances recovery, satiety, and performance. Adjust the template to fit specialized protocols such as high-protein cuts or endurance programming.

Supports Metric and Imperial Units

Toggle between kilograms/centimeters and pounds/inches instantly. Accurate unit selection ensures the BMR and TDEE calculations behind the macro targets remain precise.

How to get accurate results

Follow these steps so your numbers are useful, not just interesting

How to Use the Macro Calculator

Macronutrients are the building blocks of daily nutrition. By aligning macro intake with your goals, you can optimize training adaptations, hormone balance, and appetite control.

Enter age, weight, height, and gender to calculate basal metabolic rate using the Mifflin-St Jeor formula.
Pick your weekly activity level—from sedentary to very active—to estimate total daily energy expenditure (TDEE).
Select a goal: weight loss, maintenance, or muscle gain. The calculator adjusts calories and macro ratios accordingly.
Use the gram targets as a baseline and track progress with food logs, habit trackers, or coaching check-ins.

Dialing In Your Macro Targets

Macro planning is iterative. Start with the recommended split, monitor energy levels and body composition, then fine-tune macro percentages to match your physiology and preferences.

Increase protein to 35–40% if you are in a calorie deficit and want to preserve lean mass.
Shift 5–10% of calories from carbs to fats during low-carb or ketogenic phases.
Endurance athletes can increase carbohydrate allocation for glycogen support on heavy training days.
Recalculate every 4–6 weeks or whenever body weight changes by more than 2–3 kilograms (5 pounds).

Nutrition planning guide

Macros made practical: protein, carbs, and fats for your goal

A macro calculator turns your calorie target into daily grams of protein, carbohydrates, and fat. That gives structure for fat loss, maintenance, or muscle gain while leaving room to choose foods you actually enjoy.

Sample daily macro splits

Illustrative targets from calorie needs and goal-based percentages

Example A · Cut

~1,800 cal
Lose weight split

P 158g · C 158g · F 60g

35/35/30

Example B · Maintain

~2,400 cal
Maintain split

P 180g · C 240g · F 80g

30/40/30

Example C · Bulk

~3,000 cal
Gain split

P 225g · C 338g · F 83g

30/45/25

Examples are rounded for readability. Use the calculator above for your exact inputs.

Why count macros instead of only calories?

Calories drive weight change; macros influence satiety, training performance, and how much of that weight change is fat vs lean tissue. Hitting protein is especially important in a deficit.

Protein: muscle repair, fullness, higher thermic effect
Carbs: training fuel and glycogen replenishment
Fats: hormones, fat-soluble vitamins, meal satisfaction

How this macro calculator builds your targets

We estimate needs with Mifflin–St Jeor BMR, apply an activity multiplier for TDEE, adjust calories for your goal, then split energy into protein, carbs, and fats using goal-specific percentages.

Fat loss: higher protein share to protect muscle
Maintenance: balanced 30/40/30-style split
Gain: more carbohydrates to support training volume

Practical protein targets

Many active adults do well around 1.6–2.2 g of protein per kilogram of body weight (roughly 0.7–1.0 g per pound), especially while cutting. The calculator’s percentage split is a starting template—feel free to bias protein upward if appetite and preferences allow.

Flexible dieting tips that stick

You do not need perfect daily hits. Averaging within about 5–10 g on protein and carbs across the week is usually enough. Build meals around a protein source, add produce and carbs for energy, then fill remaining calories with fats you like.

Medical diets (kidney disease, diabetes insulin therapy, eating-disorder recovery) need professional supervision—do not override clinical advice with a generic macro split.

When and how to adjust macros

If weight trends the wrong way for 2–3 weeks, change calories first (about 5–10%), then reshuffle carbs and fats. Keep protein relatively stable while cutting.

About this calculator

This free macro calculator estimates calories and macronutrient grams in your browser from age, size, activity, and goal. It is educational nutrition planning—not medical diet therapy.

Official references for this calculator

Primary public and peer-reviewed sources that inform the formulas, category bands, or screening cutoffs used here.

1American Journal of Clinical Nutrition (PubMed)
A new predictive equation for resting energy expenditure in healthy individuals (Mifflin–St Jeor)
Equation commonly used for adult BMR / resting energy expenditure estimates.
https://pubmed.ncbi.nlm.nih.gov/2305711/
2World Health Organization (WHO)
Obesity and overweight (fact sheet)
Adult overweight ≥25 BMI and obesity ≥30 BMI; explains BMI as a population screening marker.
https://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight

Educational use only. Category labels on this site summarize public guidance and may not capture every local clinical pathway. Always follow advice from your clinician or national health service.

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Frequently Asked Questions

Straight answers about accuracy, timing, and how to use your results

Consistency beats perfection. Track intake during the first few weeks to learn portion sizes, then use macro awareness to guide meal planning. Periodic tracking helps you recalibrate without becoming obsessive.