Macro Calculator - Personalized Nutrition & Macro Planning
Calculate your daily protein, carbs, and fat needs based on your goals, activity level, and body composition.
About This Macro Calculator
This Macro Calculator uses evidence-based formulas including Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle to determine your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Based on your personal goals (weight loss, maintenance, or muscle gain), activity level, and preferred diet style (Balanced, Low Carb, High Protein, or Ketogenic), it calculates your optimal daily intake of protein, carbohydrates, and fats.
The calculator also provides a 12-week weight projection, meal plan distribution, macro food equivalents, and expert health insights to help you achieve your nutrition goals effectively. Whether you're following an IIFYM (If It Fits Your Macros) approach or seeking personalized macro targets for bodybuilding, weight loss, or general health, this tool provides science-backed recommendations.
Recommended input ranges: Age 14-100 years, Height 100-250cm (3'3"-8'2"), Weight 30-300kg (66-660lbs), Body Fat 3-60%. Activity levels range from sedentary to athlete, and diet styles accommodate various nutritional approaches from standard balanced to ketogenic.
- Multiple BMR formulas (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle)
- Customizable diet styles (Balanced, Low Carb, High Protein, Keto)
- 12-week weight projection chart with visual timeline
- Formula comparison table for BMR & TDEE
- Macro distribution pie chart visualization
- Meal plan distribution for 3-6 meals per day
- Macro food equivalents for practical meal planning
- Expert analysis and health insights
- Health & safety warnings for extreme values
- Micronutrient reminder for complete nutrition
Frequently Asked Questions
How do I figure out my macros?
To calculate your macros, first determine your TDEE using a BMR formula multiplied by your activity factor. Then, based on your goal (weight loss, maintenance, or gain) and diet style, allocate percentages to protein (4 kcal/g), carbs (4 kcal/g), and fat (9 kcal/g). Our calculator automates this process using evidence-based formulas.
What is the 40 40 20 rule for macros?
The 40-40-20 rule means 40% of calories from protein, 40% from carbs, and 20% from fat. While popular in bodybuilding, this ratio isn't optimal for everyone. A balanced approach typically uses 30% protein, 40% carbs, and 30% fat for maintenance, adjusting based on individual goals and preferences.
Is there a macro calculator that's accurate?
Accuracy depends on the formula used. The Mifflin-St Jeor equation is most accurate for average individuals (within 10% error). Katch-McArdle is more accurate if you know your body fat percentage, as it uses lean body mass. Our calculator provides all three formulas for comparison.
Are there any free macro calculators?
Yes, our Macro Calculator is completely free and provides comprehensive results including BMR, TDEE, macro breakdown, 12-week projections, meal planning, and expert insights without requiring registration or payment.
What is a good macro ratio for losing weight?
For weight loss, a common effective ratio is 35% protein, 35% carbs, and 30% fat. Higher protein helps preserve muscle mass during caloric deficit. Low-carb approaches may use 40% protein, 20% carbs, 40% fat. Choose based on your preferences and activity level.
What macros should I eat to lose 20 lbs?
To lose 20 lbs, create a moderate calorie deficit of 500-750 kcal/day below your TDEE. For example, if your TDEE is 2200 kcal, eat 1500-1700 kcal with macros around 35% protein (131g), 35% carbs (131g), 30% fat (50g). This targets approximately 0.5-1 lb loss per week, reaching 20 lbs in 20-40 weeks.