Post-Workout Nutrition Calculator
What you eat after training determines your results. Get your personalized protein, carbs, and calorie targets for optimal recovery.
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Post-Workout Nutrition Basics: Protein, Carbs, and Fluids
After exercise, your body needs three things to recover: protein to rebuild muscle fibers, carbohydrates to replenish glycogen stores, and fluids to replace sweat losses. Skipping any of these slows recovery and reduces the benefit of your training.
🥩 Protein
Rebuilds muscle fibers damaged during training. Triggers muscle protein synthesis (MPS).
🍞 Carbs
Restores glycogen used as fuel. More carbs needed after longer or more intense sessions.
💧 Fluids
Replaces sweat. Add electrolytes (sodium, potassium) after heavy sweating sessions.
The exact amounts of each depend on your body weight, the type of workout, its intensity, and its duration. The calculator above personalizes all three targets automatically.
Protein Target: 0.3-0.5 g/kg Guidance
The Journal of the International Society of Sports Nutrition (JISSN) recommends 0.3 to 0.5 grams of protein per kilogram of body weight per meal to maximize muscle protein synthesis. Here is how that translates by body weight:
Protein formula (JISSN):
Post-workout protein = body weight (kg) × 0.3 to 0.5 g
Example: 75 kg × 0.4 = 30 g protein
| Body Weight | Protein Target | Notes |
|---|---|---|
| 60 kg (132 lb) | 18-30 g | Lighter athletes, lower end |
| 75 kg (165 lb) | 23-38 g | Average adult, standard dose |
| 90 kg (198 lb) | 27-45 g | Heavier athletes, upper end |
| 100+ kg (220+ lb) | 30-50 g | Cap at ~40 g per meal (diminishing returns) |
Eating more than 40 grams of protein in a single meal offers diminishing returns — the body can only use so much for muscle synthesis at once. Spread your remaining protein across other meals throughout the day.
Carb Target: By Session Intensity
Carbohydrate needs scale with how much glycogen your session depleted. Longer and more intense sessions burn more glycogen and require more carbs to replenish:
| Session Type | Carb Target | Notes |
|---|---|---|
| Strength training (45-60 min) | 0.5-1.0 g/kg | Moderate glycogen depletion |
| Endurance (60-90 min) | 1.0-1.2 g/kg | Significant glycogen depletion |
| Endurance (90+ min) | 1.2-1.5 g/kg | High depletion, prioritize carbs |
| HIIT (20-30 min) | 0.7-1.0 g/kg | Moderate depletion, short duration |
| Light activity (<30 min) | 0.3-0.5 g/kg | Minimal depletion, optional |
For a 75 kg person after a 60-minute strength session: 75 × 0.8 = 60 g carbs. After a 90-minute endurance run: 75 × 1.2 = 90 g carbs. The calculator above adjusts this automatically based on your inputs.
Timing: The Real Anabolic Window (Wider Than the Myth)
The "30-minute anabolic window" is a myth. Research by Schoenfeld and Aragon (2018) showed that the window is much wider — several hours — especially if you ate a pre-workout meal. Here is the honest guidance:
- If you ate pre-workout (within 3 hours): Eat within 1 to 2 hours post-workout. No rush — amino acids from your pre-workout meal are still circulating.
- If you trained fasted: Eat within 30 to 60 minutes. Your body has no circulating amino acids, so post-workout protein is more time-sensitive.
- If life delays the meal: Do not panic. Total daily protein and calorie intake matters more than exact timing. Eat when you can.
- The real priority: Hit your daily protein target (1.6 to 2.2 g/kg) across all meals. Post-workout timing is a minor optimization.
The anabolic window is real but wide. Focus on consistency and total intake first; fine-tune timing only once the basics are solid.
How the Calculator Works
The calculator uses evidence-based formulas from the Journal of the International Society of Sports Nutrition and the American College of Sports Medicine. Here is what it computes:
Protein:
Weight (kg) × 0.35 × intensity multiplier (0.9-1.2)
Carbs (strength):
Weight (kg) × 0.6 × intensity multiplier
Carbs (cardio):
Weight (kg) × 1.0 × intensity × (duration ÷ 60)
Fat:
Weight (kg) × 0.05-0.08 (kept low for faster absorption)
Calories:
(Protein × 4) + (Carbs × 4) + (Fat × 9)
The intensity multiplier adjusts targets upward for hard sessions (1.2x) and downward for light sessions (0.9x). Cardio carb targets scale with duration because longer sessions deplete more glycogen.
Sample Post-Workout Meals
Here are real-food meal options that hit common protein and carb targets. Pick one that matches your calculator result:
| Meal | Protein | Carbs | Calories | Notes |
|---|---|---|---|---|
| Grilled chicken + white rice | 40 g | 55 g | ~400 kcal | Classic strength-training meal |
| Greek yogurt + berries + honey | 20 g | 35 g | ~250 kcal | Light, fast-digesting |
| Protein shake + banana | 25 g | 30 g | ~230 kcal | Convenient, fast absorption |
| Chocolate milk (16 oz) | 16 g | 54 g | ~350 kcal | Ideal 3:1 ratio, cheap |
| 3 eggs + toast + avocado | 22 g | 30 g | ~420 kcal | Whole-food, satiating |
Chocolate milk is a surprisingly good option — its natural 3:1 carb-to-protein ratio matches what sports nutritionists recommend, and it is cheap and widely available.
Hydration and Electrolytes
Replacing fluids lost to sweat is just as important as protein and carbs. A good rule: drink 16 to 24 oz of fluid for every pound of body weight lost during the session (weigh yourself before and after if you sweat heavily).
Electrolytes: After sessions lasting over 60 minutes or in hot conditions, replace sodium, potassium, and magnesium. A pinch of salt in water, a banana, or a commercial electrolyte drink works. For precise electrolyte targets based on sweat rate, use the Electrolyte Balance Calculator.
Dehydration as little as 2 percent of body weight impairs performance and recovery. If your urine is dark yellow, drink more before your next session.
Worked Example: Full Post-Workout Plan
Here is a complete walkthrough for a 75 kg (165 lb) person after a 60-minute moderate-intensity strength session:
Step 1 — Protein (0.35 g/kg × intensity 1.0):
75 × 0.35 × 1.0 = 26 g protein
Step 2 — Carbs (0.6 g/kg × intensity 1.0):
75 × 0.6 × 1.0 = 45 g carbs
Step 3 — Fat (0.08 g/kg):
75 × 0.08 = 6 g fat
Step 4 — Calories:
(26 × 4) + (45 × 4) + (6 × 9) = 104 + 180 + 54 = 338 kcal
Step 5 — Meal match:
Grilled chicken (120g) + 1 cup white rice ≈ 35 g protein, 45 g carbs, 5 g fat — close match.
This person eats within 1 hour of finishing, drinks 20 oz of water, and hits their daily protein target across remaining meals. Total post-workout: ~338 kcal, 26 g protein, 45 g carbs.
How to Use This Calculator & What to Do With Your Result
How to use it:
- Enter your body weight in kilograms.
- Select your workout type (strength, cardio, or HIIT).
- Choose your intensity level (low, moderate, or high).
- Enter the session duration in minutes.
- Click "Calculate My Post-Workout Nutrition" to get protein, carb, fat, and calorie targets.
What to do with your result:
- Pick a meal from the sample meals table that matches your protein and carb targets.
- Eat within 1 to 2 hours of finishing (sooner if you trained fasted).
- Drink 16 to 24 oz of fluid per pound of body weight lost to sweat.
- Track the meal in your food diary to stay on your daily protein target (use the Protein Calculator).
- For muscle gain goals, ensure your total daily calories exceed maintenance (use the Muscle Gain Calculator).
- For endurance athletes, prioritize carbs more heavily — use the higher end of the carb range.
Post-Workout Nutrition Calculator FAQs
Disclaimer: This post-workout nutrition calculator provides estimates for educational purposes only based on ISSN and ACSM guidelines. Individual needs vary based on metabolism, training history, and health conditions. If you have diabetes, kidney disease, an eating disorder, or other medical conditions, consult a registered dietitian or your healthcare provider. This is not medical advice — talk to your doctor.