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HealthCalc

Macro Calculator for Weight Loss

Find your optimal daily protein, carbohydrate, and fat targets. Estimate your maintenance needs or enter your calories directly to generate a custom nutrition split.

Unit System
Gender
Height
ft
in
lbs
Fitness Goal
Advanced Settings (Optional)
Energy (TDEE) Source
kcal

Understanding Your Macro Calculator Results

A calorie and macro calculator helps bridge the gap between scale weight and body composition. While calories determine the rate of your weight change, macronutrients (proteins, carbohydrates, and fats) determine what that change is made of. Following the right macro split ensures you lose body fat, build or preserve lean muscle tissue, and maintain stable energy levels.

By calculating your daily macros using science-based physiological equations like the Mifflin-St Jeor formula or the lean-body-mass-focused Katch-McArdle formula, you establish a customized nutrition blueprint. Our tool factors in your biological metrics, activity factor, and fitness goal to deliver highly customized recommendations.

Standard Macronutrient Split Strategies

Balanced Split (40/30/30)

Ideal for general health, weight maintenance, and moderate athletic performance. It provides enough carbs to fuel workouts, adequate protein for muscle tissue repair, and moderate fats for hormone synthesis.

High Protein / Cutting Split (30/40/30)

The preferred macro calculator for fat loss strategy for bodybuilders. Preserving lean muscle tissue during a caloric deficit is essential to prevent drop-offs in metabolic rate (BMR). Higher protein also enhances dietary satiety.

Low Carb Split (20/40/40)

Suitable for individuals who have mild insulin sensitivity or perform better on a lower carbohydrate diet. Restricting carbs slightly increases fat oxidation and may help reduce water retention.

Keto Macro Calculator Split (5/25/70)

A classic keto macro calculator target. Carbohydrates are restricted below 50g per day, forcing your liver to synthesize ketone bodies from dietary and stored fat for system energy (ketosis).

Macro Calculator for Women vs. Men

Biological differences impact calorie requirements and macro selections. Men generally possess a higher percentage of lean skeletal muscle mass, which raises baseline TDEE. Conversely, women naturally maintain a higher body fat percentage for essential reproductive health.

Our macro calculator for women uses modified BMR constant parameters. Additionally, women often benefit from slightly higher fat splits (e.g. 35-40% fat) for healthy menstrual cycle regulation, while men often benefit from high protein splits for muscle building.

Frequently Asked Questions

What are macronutrients (macros)?
Macronutrients are the three main nutrient groups your body needs in large quantities to produce energy and maintain cellular structure: protein (4 kcal/g), carbohydrates (4 kcal/g), and fats (9 kcal/g).
What is a good macro split for weight loss?
A standard macro split for weight loss (cutting) is High Protein or Moderate Carb, such as 40% protein, 30% carbohydrates, and 30% fat. This high protein ratio helps preserve lean muscle mass and increases fullness while in a calorie deficit.
How do you calculate macros from calories?
First, determine your target daily calorie intake. Then, allocate percentages of those calories to each macro (e.g., 30% protein, 40% carbs, 30% fat). Finally, convert the calories into grams: divide protein and carb calories by 4, and fat calories by 9.
What are keto macros?
A ketogenic (keto) split is characterized by very low carbs, moderate protein, and high fat. A standard keto split is 5% carbohydrates, 25% protein, and 70% fat. This forces the body into ketosis, where it burns fat for fuel instead of glucose.
Do macros or calories matter more for weight loss?
Calories determine whether you lose, maintain, or gain weight (energy balance). Macros determine the *composition* of that weight change (e.g. losing fat vs. losing muscle) and heavily impact hunger, energy levels, and metabolic health.

Also Try These Free Calculators

Protein Intake Calculator

See exactly how many grams of protein your body needs daily.

TDEE Calculator

Get your total daily calorie burn to feed your macro calculator.

Calorie Deficit Calculator

Combine with a deficit to cut fat while hitting your macro targets.

Carb Cycling Calculator

Cycle carbs on training vs rest days to amplify your results.