2026-09-16 9 min

Muscle Building Protein Calculator

Muscle-building protein target from body weight and phase, with per-meal distribution.

Calculator

Body Weight kg

Phase

Meals per Day meals

Results update live as you type

Status:135 g/day34 g/mealScore 90/100

Muscle Building Protein Calculator Results

Score90

Daily Protein135 g/day

Per Kilo1.8 g/kg

Per Meal34 g/meal

Protein Kcal540 kcal

VerdictIdeal feeding size for synthesis.

135 g daily (1.8 g/kg for bulk), about 34 g across 4 meals — Ideal feeding size for synthesis.

Protein Breakdown

Measure	Value	Context
Daily protein	135 g	1.8 x 75 kg
Per kilo	1.8 g/kg	bulk phase rate
Per meal	34 g	daily / 4
Protein kcal	540 kcal	grams x 4
Leucine check	Cleared	~2-3 g leucine per 25-30 g
Verdict	Ideal feeding size for synthesis.	feeding check

Recommendations

▸Anchor each meal with a palm-and-half of meat, fish, dairy or soy.
▸A slow-digesting pre-bed serving (casein, yogurt) extends overnight synthesis.
▸Water intake should rise with protein — see the hydration calculators.
▸135 g daily (1.8 g/kg for bulk), about 34 g across 4 meals — Ideal feeding size for synthesis.

Results

Optimal

Protein Score

90/100

Feeding setup rating

Daily Protein

135 g/day

g/kg x weight

Per Kilo

1.8 g/kg

Phase rate

Per Meal

34 g/meal

Daily / meals

Protein Kcal

540 kcal

Grams x 4

Verdict

Ideal feeding size for synthesis.

Feeding check

Macro math is exact calorie-to-gram arithmetic (protein/carbs 4 kcal/g, fat 9 kcal/g) on ISSN protein guidance.

Visualizations

Protein gauges (g)

135 gDaily

101.3 gMeal x3

60 gMeals x15

Protein vs 250 g reference

Your grams54%

To reference46%

Fuel Score

Score90/100

Formula

Phase-adjusted protein protects muscle in deficits and avoids wasteful excess in surpluses.

Daily protein = phase rate x body weight; per meal = daily / meals

Alternative Form

Phase rates: bulk 1.8, maintain 2.0, cut 2.3 g/kg

Variables

Symbol	Name	Unit	Description
W	Weight	kg	Morning fasted weight
R	Phase rate	g/kg	1.8 / 2.0 / 2.3
D	Daily	g	R x W
M	Meals	count	Daily feedings
PM	Per meal	g	D / M

Explanation

Seventy-five kilos bulking needs 135 g daily — four 34 g meals clears the leucine threshold every time.

Derivation

ISSN/Morton meta-analysis (1.6 g/kg ceiling) with cutting uplift for deficits.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Pick the phase rate.

Bulk 1.8, maintain 2.0, cut 2.3 g/kg

Phase:bulk

Intermediate: rate lookup

Result: 1.8 g/kg

Step 2

Multiply by body weight.

Daily = rate x kg

Weight:75 kg

Intermediate: 1.8 x 75

Result: 135 g daily

Step 3

Split across meals.

Per meal = daily / meals

Meals:4

Intermediate: 135 / 4

Result: ~34 g per meal

Step 4

Check the leucine threshold.

25-30 g clears ~2-3 g leucine

Meal:34 g

Intermediate: threshold check

Result: Cleared every meal

Step 5

Convert to calories.

kcal = grams x 4

Daily:135 g

Intermediate: 135 x 4

Result: 540 kcal from protein

Step 6

Score the setup.

Ideal 20-55 g feedings score 90

Meal:34 g

Intermediate: feeding check

Result: Protein score = 90/100

Final Answer

90/100

Worked Examples

See how the calculator works with different scenarios.

Scenario

75 kg bulking, 4 meals.

Inputs

Weight:75 kg

Phase:bulk

Calculation

Daily 1.8 x 75 = 135 g; meal ~34 g

Result

Ideal feedings, score 90

Interpretation

Eggs plus dairy plus meat easily covers this.

Understanding Your Result

Your Result: Protein Score: 90/100

Typical range: Protein 1.6-2.2 g/kg, fat 0.7-1.0 g/kg, remainder carbs; surplus 250-350 kcal for lean gains.

What This Means

The output converts body weight and calories into daily protein, carb and fat grams with a 0-100 fuel score.

Why It Matters

Muscle needs both bricks (protein) and energy (surplus plus carbs); missing either stalls growth regardless of training.

Professional Interpretation

Dietitians set protein first, fat floor second, then fill training demands with carbs — exactly this order.

Protein first

Setting protein before carbs prevents the classic error of a 4,000 kcal diet with 90 g protein.

Carbs fuel volume

High-volume blocks run on glycogen; low-carb plus high-volume equals flat, weak sessions.

Recommendations

•Hit protein within 10 g daily
•Keep fat above 0.7 g/kg
•Time carbs around training
•Adjust from 2-week weight trends

Educational Content

Introduction

This calculator turns body weight into a complete muscle-building macro plan.

Concept Explanation

Protein builds, carbs fuel, fat regulates — dosed per kilo, they remove nutrition guesswork.

Applications

▸Bulk macro setup

▸Protein audits

▸Cutting adjustments

▸Meal planning

▸Stall diagnosis

▸Travel eating

Benefits

•Exact gram targets
•Evidence-based protein
•Training-fueling carbs
•Hormone-safe fat floor
•0-100 fuel score

Limitations

•No food-quality scoring
•No timing model
•No micronutrients
•Static activity estimate
•Individual digestion variance

Best Practices

•Weigh protein foods raw
•Front-load carbs pre-training
•Keep 3-5 protein feedings
•Drink water with high protein
•Re-run when weight shifts 3 kg

Common Misconceptions

Myth: Carbs make you fat.

Truth: Surplus makes you fat. Carbs fuel training and spare protein; lifters restricting them lose performance first.

Myth: You need 300 g protein.

Truth: Past ~2.2 g/kg there is no extra muscle benefit — just expensive glucose.

Myth: Fat should be minimized.

Truth: Below ~0.7 g/kg, testosterone and vitamin absorption suffer. Fat is essential, not the enemy.

Practical Tips

•Anchor each meal with 30-50 g protein
•Put half your carbs around training
•Cook with measured oils to control fat
•Keep emergency protein (Greek yogurt, whey) handy
•Fiber 14 g per 1,000 kcal keeps cuts sane
•Creatine 3-5 g daily, timing irrelevant

Common Mistakes

Protein guessing

Track two weeks with a scale; eyeballing undercounts by 30-50 g daily.

Fearing carbs

Low glycogen turns hypertrophy sessions into grinders. Fuel the work.

Zero-fat dieting

Crashing fat crashes hormones. Hold the 0.7 g/kg floor even when cutting.

Changing everything weekly

Hold macros 2-3 weeks before judging; water noise masks faster reads.

Ignoring liquid calories

Shakes, juices and alcohol count fully. Log every sip for a week.

No peri-workout plan

Train fed with carbs onboard; fasted high-volume sessions underperform.

Assumptions

This calculator makes the following assumptions to provide estimates:

Healthy adult: Targets fit healthy adults; kidney or metabolic conditions need clinicians.

Mixed diet: Any pattern works if gram targets land; no foods are mandatory.

4/4/9 energy values: Protein and carbs 4 kcal/g, fat 9 kcal/g by Atwater convention.

Training present: Macros assume 3-5 progressive sessions weekly.

Stable weight basis: Body weight is a morning fasted average.

Limitations

Be aware of these limitations when using this calculator:

No micros: Vitamins, minerals and fiber need separate attention.

No timing model: Distribution guidance is heuristic, not simulated.

Static estimate: Needs shift with volume blocks; re-run as training changes.

Digestion variance: Identical macros absorb differently across guts.

Supplement blind: Creatine and caffeine help but sit outside macro math.

Frequently Asked Questions

Answers to common questions about this calculator.

How fast can I gain muscle?

Beginners gain roughly 0.5-1 kg per month, intermediates 0.25-0.5 kg, advanced lifters under 0.25 kg. Faster scale gains are mostly fat and water.

How big a calorie surplus?

About 250-350 kcal daily (roughly 5-10% above maintenance) maximizes lean gain while limiting fat. Larger surpluses add fat, not extra muscle.

How much protein to build muscle?

1.6-2.2 g per kg of body weight daily, spread over 3-5 meals with 0.3-0.5 g/kg each. More than 2.2 g/kg shows no further muscle benefit.

Should I bulk or cut first?

Above ~20% body fat (men) or ~30% (women), cut first — extra fat worsens nutrient partitioning. Leaner lifters gain better on a small surplus.

How long to gain 5 kg of muscle?

A dedicated beginner needs roughly 8-12 months; an intermediate 18-24 months. Muscle accrues in months and years, not weeks.

Do I need progressive overload to grow?

Yes. Muscle adapts to rising tension, so lifts must climb over time via weight, reps or sets. Same weights mean same muscles.

Can I build muscle and lose fat together?

Beginners, detrained and high-body-fat lifters can recomp at maintenance calories. Lean intermediates need distinct bulk and cut phases.

How do I know gains are muscle, not fat?

Track strength on key lifts, waist circumference and scale weight together. Rising lifts with a stable waist mean lean gains.

What stalls muscle gain most often?

Too-small surplus, protein under 1.6 g/kg, under-sleeping, program-hopping, and never deloading. Fix food and sleep before changing programs.

How much sleep for muscle growth?

Seven to nine hours. One week of short sleep measurably blunts muscle protein synthesis and spikes hunger hormones.

Do I need supplements to grow?

No. Creatine monohydrate (3-5 g daily) is the only supplement with strong muscle evidence; everything else is optional once food and training are right.

When should I stop bulking?

Cap bulks at ~20% body fat for men or ~30% for women, or after 4-6 months, then cut 8-12 weeks to restore insulin sensitivity and appetite control.

Related Calculators

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Related Guides

Deepen your understanding with these educational resources.

Getting Started with Strength Training

Progressive overload, volume landmarks and recovery basics.

Cardio Training Essentials

Zones, VO2 max and weekly aerobic volume that actually moves fitness.

Nutrition for Active People

Protein, calories and hydration to support training and recovery.

Understanding Recovery

Sleep, rest days and deloads that turn training into adaptation.

Glossary

Technical terms used in mortgage calculations explained in plain language.

Maintenance: Calories holding weight stable; bulks add 5-10% above it.
Surplus: Calories above maintenance that fund new tissue.
Protein target: 1.6-2.2 g/kg daily for muscle gain; higher while cutting.
Macro split: How calories divide across protein, carbs and fat.
Carbohydrate: Primary training fuel; 4 kcal/g, stored as glycogen.
Dietary fat: Hormone and vitamin support; 9 kcal/g, floor ~0.7 g/kg.
Glycogen: Stored carbohydrate in muscle and liver powering hard sets.
Leucine threshold: ~2-3 g leucine per meal maximally triggers protein synthesis.
Meal distribution: Spreading protein over 3-5 meals beats one giant serving.
Creatine: 3-5 g daily monohydrate; the best-evidenced muscle supplement.
Thermic effect: Protein costs ~20-30% of its calories to digest.
Refeed: Planned higher-calorie days that ease long dieting or fuel volume.

Authoritative References

Trusted sources and standards referenced by this calculator.

ISSN — Sports nutrition position stands ACSM — Exercise guidance and resources CDC — Physical activity guidelines WHO — Physical activity fact sheets NIH — Exercise and health information AtlasCalcs — Health resources

Applicable Standards

ISSN position stands on protein, creatine and nutrient timingWHO/FAO macronutrient guidelinesACSM nutrition and athletic performance joint position

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Page Information

Last Updated:

2026-09-16

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.