Calculator Inputs
Example Data Table
| Profile | Weight | Activity | Maintenance | Lean Surplus | Target Calories | Protein |
|---|---|---|---|---|---|---|
| Beginner lifter | 70 kg | Moderate | 2450 kcal | 250 kcal | 2700 kcal | 140 g |
| Intermediate lifter | 82 kg | Very active | 3050 kcal | 300 kcal | 3350 kcal | 164 g |
| Advanced lifter | 90 kg | Athlete | 3600 kcal | 225 kcal | 3825 kcal | 180 g |
Formula Used
Mifflin-St Jeor BMR: Male = 10W + 6.25H - 5A + 5. Female = 10W + 6.25H - 5A - 161.
Katch-McArdle BMR: 370 + 21.6 × lean body mass in kg.
Maintenance Calories: BMR × activity multiplier.
Lean Bulk Target: maintenance calories + selected surplus.
Weekly Gain Method: daily surplus = body weight × gain percent × 7700 ÷ 7.
Macros: protein = body weight × protein rate. Fat = body weight × fat rate. Carbs fill remaining calories.
How To Use This Calculator
Enter your sex, age, height, weight, and body fat estimate. Choose your activity level with care.
Select a surplus method. The weekly gain method is useful for lean bulking. It links calories to a planned body weight increase.
Set protein and fat targets. The calculator then gives carbohydrates from remaining calories.
Press calculate. Your results appear above the form and below the header. Use the chart, CSV, and PDF options for tracking.
Lean Bulking Guide
What Lean Bulking Means
Lean bulking means eating above maintenance with control. The goal is muscle gain with limited fat gain. It is not the same as eating anything without a plan. A small surplus works better for most lifters. It supports hard training, recovery, and steady progress. It also keeps cutting phases shorter later.
Why Calories Matter
Muscle growth needs energy. Your body uses calories for training, repair, hormones, and daily movement. If calories are too low, strength may stall. If calories are too high, fat gain rises quickly. This calculator estimates maintenance first. Then it adds a controlled surplus based on your goal.
Choosing The Right Surplus
A lean bulk often works best with a small daily surplus. Many people start around 150 to 350 calories. Faster gain may suit beginners. Slower gain may suit advanced lifters. Your training age matters. Your body fat level also matters. If body fat is already high, use a smaller surplus.
Macro Planning
Protein supports muscle repair. Fat supports hormones and general health. Carbohydrates fuel hard sessions. The calculator assigns protein and fat first. Remaining calories become carbs. This keeps the plan practical. You can divide macros across meals. Meal timing is less important than daily consistency.
Tracking Progress
Weigh yourself several mornings per week. Use the weekly average. Do not react to one noisy weigh-in. Strength should improve over time. Measurements and photos can also help. If weight rises too fast, reduce calories. If weight does not move for two weeks, add a small amount.
Training And Recovery
Calories alone do not build muscle. You need progressive resistance training. Sleep and recovery matter too. Keep enough rest days. Train with good technique. Increase volume slowly. A lean bulk works best when food, training, and recovery match.
FAQs
1. What is a lean bulk?
A lean bulk is a controlled calorie surplus. It aims to support muscle growth while limiting extra fat gain.
2. How big should my calorie surplus be?
Many lifters start with 150 to 350 calories daily. Beginners may handle more. Advanced lifters often need less.
3. Should I use body fat percentage?
Yes, if you know it. It helps estimate lean mass and improves the Katch-McArdle part of the calculation.
4. How fast should I gain weight?
A common lean target is about 0.25% to 0.5% of body weight weekly. Adjust based on progress.
5. Are carbohydrates required for bulking?
They are not strictly required, but they help fuel hard lifting. Higher training volume usually benefits from more carbs.
6. How much protein should I eat?
Most lifters do well around 1.6 to 2.2 grams per kilogram of body weight daily.
7. When should I change calories?
Review weekly averages. If weight is flat for two weeks, add calories. If gain is too fast, reduce calories.
8. Is this calculator medical advice?
No. It is an educational planning tool. Speak with a qualified professional for personal medical or nutrition needs.