Calculator
Formula Used
This calculator uses lean mass when body fat is supplied. That method follows the Katch-McArdle style estimate:
BMR = 370 + 21.6 × lean body mass in kilograms
If body fat is missing, it uses the Mifflin-St Jeor estimate:
Male BMR = 10W + 6.25H - 5A + 5
Female BMR = 10W + 6.25H - 5A - 161
TDEE is calculated by multiplying BMR by the selected activity factor. Goal calories are then adjusted by the selected deficit or surplus. Protein and fat are fixed first. Carbs receive the remaining calories.
Protein calories = protein grams × 4
Fat calories = fat grams × 9
Carb grams = remaining calories ÷ 4
How to Use This Calculator
- Select your preferred unit system.
- Enter age, gender, weight, height, and body fat.
- Choose the activity level that matches your average week.
- Select cutting, maintenance, bulking, or a custom target.
- Adjust protein and fat rates if you follow a special plan.
- Press the calculate button to show your macro targets.
- Use the CSV or PDF button to save your result.
Example Data Table
| Profile | Goal | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|---|
| 180 lb male, moderate activity | Cut | 2,200 kcal | 180 g | 210 g | 60 g |
| 145 lb female, light activity | Maintenance | 1,900 kcal | 130 g | 210 g | 55 g |
| 200 lb male, very active | Lean bulk | 3,200 kcal | 200 g | 410 g | 75 g |
Macro Planning Guide
Why Macros Matter
Macro planning turns a vague diet into a clear daily target. Calories control body weight change. Protein supports muscle repair. Carbohydrates fuel training. Fats support hormones, joints, and general health. A good plan balances all four factors without making food choices too rigid.
Choosing a Goal
A cutting phase should use a controlled deficit. A twenty percent deficit is common for steady fat loss. A mild cut may suit leaner users. A lean bulk uses a small surplus. This helps muscle gain while limiting unnecessary fat gain. Maintenance is useful when performance, recovery, or lifestyle balance matters most.
Setting Protein
Protein is usually placed first because it protects lean mass during dieting. Many lifters use about one gram per pound of body weight. Lean mass can also be used when body fat is high. This calculator lets you choose either method. Keep protein steady, then adjust carbs and fats around your calories.
Balancing Carbs and Fats
Fats should not be pushed too low. A moderate fat target makes the diet easier to follow. Carbs receive the remaining calories. More carbs can help strength training, running, sports, and high volume workouts. Lower carbs may work for some users, but very low levels can reduce training drive.
Tracking Progress
Use the result as a starting estimate. Track body weight averages for two to three weeks. Also watch gym performance, hunger, sleep, and mood. If weight does not move as expected, change calories by five to ten percent. Small changes are better than extreme cuts. Consistency makes the calculator more useful.
Meal Planning
The meal split gives a simple daily structure. You do not need perfect meals. You need repeatable meals. Build each plate around protein. Add carbs near training if performance matters. Add fats where they improve taste and fullness. Save your result, compare weeks, and refine your plan with real feedback.
FAQs
1. What does this macro calculator estimate?
It estimates daily calories, protein, carbs, fats, fiber range, BMR, TDEE, and per meal macro targets using your body data, goal, and activity level.
2. Should I use body weight or lean mass for protein?
Body weight is simple and works for many users. Lean mass can be better when body fat is high or when you want a more refined protein target.
3. Is a twenty percent deficit safe?
Many people use it for fat loss. Lean, stressed, or highly active users may prefer a smaller deficit to protect energy and training performance.
4. Why are carbs calculated last?
Protein and fat are set first because they serve key body functions. Carbs then fill the remaining calories and support training performance.
5. Can I use this for bulking?
Yes. Choose lean bulk or bulk. A smaller surplus often helps gain muscle while reducing unnecessary fat gain over time.
6. Why is my carb result very low?
Your calorie goal may be low, or protein and fat rates may be high. Reduce those rates or choose a less aggressive goal.
7. How often should I update my macros?
Review macros after two or three weeks. Update them when weight, training output, hunger, or body measurements stop matching your goal.
8. Are these results medical advice?
No. They are planning estimates. Speak with a qualified professional for medical, clinical, or condition-specific nutrition guidance.