PFC / Macro Calculator | Free Fitness Tool

Q: What is PFC?

PFC stands for Protein, Fat, and Carbohydrate — the three macronutrients. PFC balance refers to how you distribute your total daily calories across these three. Protein and carbs provide 4 kcal per gram; fat provides 9 kcal per gram.

Q: How are the goal-based ratios determined?

Each ratio is based on published evidence: Muscle gain uses ACSM/ISSN recommendations (P:30%, F:20%, C:50%); Fat loss prioritises high protein to preserve muscle (P:35%, F:25%, C:40%, Helms et al. 2014); Maintenance uses a balanced baseline (P:25%, F:30%, C:45%); Endurance prioritises glycogen (P:15%, F:25%, C:60%, Burke et al. 2011).

Q: Can I eat more protein than the recommendation?

Beyond a certain amount, gains plateau. ISSN recommends no more than 1.6–2.2 g/kg even during a muscle-gain phase. Intakes above 3 g/kg carry potential health risks, and excess protein is either oxidised for energy or stored as fat. Consult a physician before significantly increasing protein if you have kidney issues.

Q: Do I need carbohydrates for strength training?

Yes. Carbohydrates are stored as glycogen in muscles and the liver, serving as the primary fuel for high-intensity resistance training. Low carbohydrate availability impairs performance and increases muscle protein breakdown. Even during a cut, aim for at least 100 g of carbs per day.

Q: Where do I find my daily calorie target?

First use the TDEE Calculator to estimate your total daily energy expenditure. Then set your target: bulk at TDEE + 200–500 kcal, cut at TDEE − 300–500 kcal, or maintain at roughly TDEE. Enter that target calorie number here.

Enter your details

Target Calories

kcal

Find your TDEE with the TDEE Calculator

Body Weight (for protein g/kg check)

Goal

Muscle Gain (Bulk) P:30% F:20% C:50% Fat Loss (Cut) P:35% F:25% C:40% Maintenance P:25% F:30% C:45% Endurance P:15% F:25% C:60%

Goal: —

Protein (P)

—

Fat (F)

—

Carbs (C)

—

PFC ratio

P (Protein) F (Fat) C (Carbs)

Protein: — g/kg (Recommended: —)

All calculations happen on your device — nothing is sent externally

How to Use the PFC (Macros) Calculator

PFC stands for the three macronutrients: P = Protein, F = Fat and C = Carbohydrate. Even at the same total calories, how you split these three (your macro balance) changes your results, so this tool calculates the ideal split for your goal.

How to use this tool

Enter your daily calorie target and goal (cut, maintain or bulk), and the tool converts it into grams of P, F and C. If you do not know your calorie target, first find your total daily expenditure with the TDEE calculator.

What each macro does

Protein builds muscle and should be kept high when cutting to protect lean mass. Fat is needed to make hormones, so do not cut it too low—around 20-30% of calories is a guide. Carbohydrate is your main training fuel and matters most when bulking or training hard. Remember protein and carbs are about 4 kcal per gram and fat about 9 kcal.

Tips

Lock in your protein with the protein calculator first, then divide the remaining calories between fat and carbs. Do not obsess over single meals—aim to hit your targets on a weekly average.

Commonly recommended ranges

Japan's Dietary Reference Intakes give an energy-providing nutrient balance of 13–20% protein, 20–30% fat and 50–65% carbohydrate for the prevention of lifestyle-related disease. People who train usually run protein higher (20–30%) and take the difference from carbohydrate or fat. Cutting fat below about 20% starts to affect hormone production and the absorption of fat-soluble vitamins, so carbohydrate is normally the flexible one.

What happens if carbohydrate goes too low

Muscle glycogen is the main fuel for hard training. Cut carbohydrate sharply and loads and reps fall, taking total training volume down with them. When dieting while trying to hold on to muscle, a workable order of priority is: total calories first, adequate protein second, carbohydrate around training third.

When you cannot hit the numbers exactly

There is no need to weigh every meal to the gram. In practice, secure the protein at each meal and fill the remainder with carbohydrate and fat — get that order right and moderate deviation changes little. Within about ±10% across a day is fine. For total intake see the TDEE calculator, and for protein detail the protein calculator.

Glossary & FAQ

What is PFC?

PFC stands for Protein, Fat, and Carbohydrate — the three macronutrients.

PFC balance refers to how you distribute your total daily calories across these three. Macros is the shorthand term used in the fitness community.

Calorie conversion: Protein 1g = 4 kcal / Fat 1g = 9 kcal / Carbs 1g = 4 kcal

How are the goal-based ratios determined?

Each ratio is based on published evidence:

Muscle Gain: ACSM and ISSN recommendations — P:30%, F:20%, C:50%. Protein 1.6–2.2 g/kg recommended.
Fat Loss: High protein to preserve muscle (Helms et al. 2014) — P:35%, F:25%, C:40%.
Maintenance: Balanced baseline — P:25%, F:30%, C:45%.
Endurance: Glycogen priority (Burke et al. 2011) — P:15%, F:25%, C:60%.

Can I eat more protein than the recommendation?

Beyond a certain amount, gains plateau.

ISSN recommends no more than 1.6–2.2 g/kg even during a muscle-gain phase. Intakes above 3 g/kg carry potential health risks, and excess protein is either oxidised for energy or stored as fat.

Consult a physician before significantly increasing protein if you have kidney issues.

Do I need carbohydrates for strength training?

Yes. Carbohydrates are stored as glycogen in muscles and the liver, serving as the primary fuel for high-intensity resistance training.

Low carbohydrate availability impairs performance and increases muscle protein breakdown. Even during a cut, aim for at least 100 g of carbs per day to preserve performance and lean mass.

Where do I find my daily calorie target?

First use the TDEE Calculator to estimate your Total Daily Energy Expenditure.

Setting your target:
Bulk: TDEE + 200–500 kcal
Cut: TDEE − 300–500 kcal
Maintain: approximately TDEE

Enter that target here to get your PFC breakdown.

Sources
・ Thomas DT, Erdman KA, Burke LM. ACSM Joint Position Statement. Nutrition and Athletic Performance. Med Sci Sports Exerc. 2016;48(3):543-568.
・ Stokes T, et al. Recent Perspectives Regarding the Role of Dietary Protein for Muscle Hypertrophy. Nutrients. 2018;10(2):180.
・ Helms ER, et al. Evidence-based recommendations for natural bodybuilding contest preparation. J Int Soc Sports Nutr. 2014;11:20.
・ Burke LM, et al. Carbohydrates for training and competition. J Sports Sci. 2011;29 Suppl 1:S17-27.
・ Nunes EA, et al. Systematic review and meta-analysis of protein intake to support muscle mass and function in healthy adults. J Cachexia Sarcopenia Muscle. 2022;13(2):795-810.

Disclaimer
Results are estimates based on published population-level research. Optimal macro ratios vary by individual physiology, health status, and activity level. Consult a physician or registered dietitian before making significant dietary changes, especially if you have kidney or liver conditions. This tool is for informational purposes only.

Track Your Workouts in the AppIn development

Log weights, reps and menus — the Joy Next World Gym App is currently in development and free to try.

Try the App →