Calculator Form
Formula Used
Mifflin-St Jeor for men: BMR = 10W + 6.25H - 5A + 5.
Mifflin-St Jeor for women: BMR = 10W + 6.25H - 5A - 161.
Katch-McArdle: BMR = 370 + 21.6 × lean mass in kg.
TDEE: BMR × activity factor.
Lean bulk calories: TDEE + selected calorie surplus.
Protein calories: protein grams × 4.
Fat calories: fat grams × 9.
Carb grams: remaining calories ÷ 4.
How to Use This Calculator
- Select your unit system.
- Enter age, sex, weight, height, and body fat if known.
- Choose the formula that suits your data.
- Select your activity level and weekly training days.
- Choose a lean bulk surplus.
- Set protein and fat targets.
- Enter meals per day.
- Press calculate and review the result above the form.
Example Data Table
| Body Weight | Activity | TDEE | Surplus | Bulk Calories | Protein | Carbs | Fat |
|---|---|---|---|---|---|---|---|
| 70 kg | Moderate | 2500 | 250 | 2750 | 140 g | 378 g | 75 g |
| 80 kg | Very Active | 3000 | 300 | 3300 | 160 g | 454 g | 94 g |
| 90 kg | Light | 2700 | 270 | 2970 | 180 g | 334 g | 102 g |
Lean Bulk Macro Planning Guide
What Lean Bulking Means
A lean bulk is a controlled muscle gain phase. It uses a small calorie surplus. The goal is steady strength progress. The second goal is limited fat gain. This calculator estimates the daily calories and macros needed for that plan.
Why Calories Matter
Muscle growth needs enough energy. Maintenance calories only support your current weight. A lean bulk adds a small surplus. Many lifters start with five to fifteen percent above maintenance. This range supports training. It also helps keep body fat under control.
Protein Comes First
Protein supports muscle repair. It also improves meal fullness. The calculator lets you set protein by kilogram or pound. Most lean bulk plans use a steady daily target. This makes tracking easier. It also keeps recovery consistent across training and rest days.
Carbs Support Training
Carbohydrates fill the remaining calorie space after protein and fat. They help fuel hard sessions. They also support volume work. A lean bulk often includes more carbs than a cutting diet. This can improve pumps, performance, and recovery.
Fat Supports Balance
Fat is calculated by percentage or body weight. This gives flexible planning. A very low fat intake can make meals harder to follow. A balanced amount improves diet comfort. It also helps users build meals with normal foods.
Use Weekly Feedback
Track body weight for at least two weeks. Use average weight, not one daily reading. If weight does not rise, add a small calorie increase. If fat gain feels too fast, reduce the surplus. Keep training performance in mind.
Meal Planning
The meal split shows calories and macros per meal. It is a guide, not a rule. You can eat more before training. You can also save more carbs for later meals. The best plan is the one you can repeat.
Best Use
Use the calculator as a starting point. Then adjust with real progress data. Sleep, training quality, step count, and food accuracy all affect results. A lean bulk works best when changes are slow, measured, and consistent.
FAQs
What is a lean bulk macro calculator?
It estimates calories, protein, carbohydrates, and fat for controlled muscle gain. It uses body data, activity level, surplus choice, and macro settings to create daily targets.
What surplus is best for lean bulking?
Many users start with five to fifteen percent above maintenance. Smaller surpluses reduce fat gain. Larger surpluses may help hard gainers but need closer tracking.
Which BMR formula should I choose?
Mifflin-St Jeor is a strong default. Katch-McArdle is useful when body fat is known. Harris-Benedict is another common option for comparison.
How much protein should I use?
A common lean bulk range is about 1.6 to 2.2 grams per kilogram. Some users prefer grams per pound. Consistency matters more than perfect precision.
Why are carbs calculated last?
Protein and fat are set first because they have important roles. Carbs then fill the remaining calories. This keeps the total calorie target balanced.
Can I use this on rest days?
Yes. You can use the same daily target for simplicity. Some users lower carbs slightly on rest days, but weekly calories still matter most.
How often should I update my macros?
Review your average weight every two weeks. Adjust calories if progress is too slow or too fast. Small changes are usually better than large jumps.
Does this calculator guarantee muscle gain?
No calculator can guarantee results. Training, sleep, food accuracy, and recovery matter. Use the results as a starting target and adjust with progress data.