Step 1 - Your Stats
Step 2 - Your Goal
Step 3 - Diet Style
What are macronutrients? They are the three nutrients your body uses for energy. Protein (meat, eggs, legumes) repairs and builds muscle tissue. Carbohydrates (grains, fruit, vegetables) are your body's preferred fuel source. Fats (oils, nuts, avocado) regulate hormones and support brain function. Each gram of protein and carbs provides 4 calories. Each gram of fat provides 9 calories.
Your Personalized Results
How We Calculated This
| BMR (Basal Metabolic Rate) - calories your body burns at complete rest | -- |
| Activity Multiplier applied | -- |
| TDEE (Total Daily Energy Expenditure) - your true maintenance calories | -- |
| Adjustment for your goal | -- |
| Final daily calorie target | -- |
These figures are evidence-based estimates using the Mifflin-St Jeor equation, the most accurate BMR formula available. Individual results vary based on genetics, hormones, and other factors. Consult a registered dietitian or physician before making significant dietary changes.
Understanding Macros and How to Use This Calculator
"Macros" is short for macronutrients: the three categories of nutrients (protein, carbohydrates, and fat) that supply the calories your body runs on. Unlike simple calorie counting, which only tracks the total energy you consume, macro tracking looks at where those calories come from. This matters because protein, carbs, and fat each play different roles in the body: protein supports muscle repair and growth, carbohydrates are the body's primary fuel source for exercise and brain function, and fat supports hormone production and the absorption of certain vitamins.
This calculator estimates your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation, then adjusts it for your activity level to find your Total Daily Energy Expenditure (TDEE). From there, it applies a calorie adjustment based on your goal (losing fat, maintaining weight, or building muscle) and splits the resulting calorie target into grams of protein, carbohydrate, and fat based on the diet style you select.
Key Terms Explained
- Macronutrients
- The three nutrient groups that provide dietary energy: protein (4 calories per gram), carbohydrates (4 calories per gram), and fat (9 calories per gram). Alcohol also provides calories (7 per gram) but is not considered a macronutrient.
- BMR (Basal Metabolic Rate)
- The number of calories your body burns at complete rest just to maintain basic functions like breathing, circulation, and cell repair. It is the foundation for all calorie and macro calculations.
- TDEE (Total Daily Energy Expenditure)
- Your BMR plus the additional calories burned through daily movement, exercise, and digestion. This is your true "maintenance" calorie level, the amount needed to keep your weight stable.
- Caloric Deficit and Surplus
- A caloric deficit means eating fewer calories than your TDEE, which typically leads to weight loss over time. A caloric surplus means eating more than your TDEE, which supports weight and muscle gain when combined with resistance training.
Frequently Asked Questions
Should I count calories or macros?
They are not mutually exclusive. Your macro targets are derived directly from your calorie target, so hitting your macros automatically means hitting your calorie goal too. Tracking macros simply gives you more information about the quality and composition of your diet, which can help with hunger management, muscle retention, and energy levels.
How much protein do I actually need?
Most research supports a range of roughly 0.7 to 1.0 grams of protein per pound of body weight per day for people who exercise regularly, with higher amounts useful during a calorie deficit to help preserve muscle mass. Sedentary individuals can often do well with less, around 0.5 to 0.7 grams per pound.
Why do my macro ratios change with my goal?
During fat loss, a higher protein percentage helps preserve lean muscle while in a calorie deficit. During muscle gain, slightly more carbohydrate supports training performance and recovery. At maintenance, a balanced split works well for most people, though personal preference and how you feel on different ratios matter too.
What if I cannot hit my macros exactly every day?
Exact precision is not necessary. Being within 5 to 10 grams of each target on most days produces results that are virtually indistinguishable from hitting the numbers exactly. Consistency over weeks and months matters far more than any single day's totals.
Do these numbers account for muscle mass or body fat percentage?
No. The Mifflin-St Jeor equation used here is based on height, weight, age, and sex, and does not factor in body composition. Very lean or very muscular individuals may find their actual maintenance calories run somewhat higher than the estimate, since muscle tissue burns more energy than fat tissue at rest.