Advanced Meal Timing Calculator for Sports Performance

Calculator Inputs

Athlete Weight (kg)

Training Start

Duration (minutes)

Sport Goal

Session Type

Intensity

Digestive Sensitivity

Preferred Pre-Workout Meal Size

Hours Until Next Session

Expected Sweat Rate (L/hour)

Example Data Table

This sample shows how the calculator may structure one athlete plan.

Weight	Training Start	Duration	Goal	Main Meal	During Session	Recovery Meal
72 kg	6:00 PM	90 min	Endurance	3:30 PM, 166 g carbs, 22 g protein, 432 mL fluid	60 g carbs/hour, 680 mL fluid total	8:00 PM, 79 g carbs, 22 g protein, 400 mL fluid
84 kg	7:30 AM	60 min	Strength / Power	5:00 AM, 151 g carbs, 29 g protein, 504 mL fluid	20 g carbs total, 510 mL fluid total	9:00 AM, 59 g carbs, 29 g protein, 250 mL fluid

Formula Used

1. Main meal timing
Lead Time = Base Meal Window + Digestion Adjustment + Intensity Adjustment

2. Pre-workout carbohydrate target
Pre-Workout Carbs (g) = Body Weight (kg) × Carb Coefficient

3. Pre-workout protein target
Pre-Workout Protein (g) = Body Weight (kg) × Protein Coefficient

4. During-session fueling
During Carbs (g) = Carb Rate per Hour × Session Hours

5. During-session fluid
During Fluid (mL) = Fluid Rate per Hour × Session Hours × 1000

6. Recovery carbohydrate target
Recovery Carbs (g) = Body Weight (kg) × Recovery Carb Coefficient

7. Recovery protein target
Recovery Protein (g) = Body Weight (kg) × Recovery Protein Coefficient

8. Post-session fluid target
Post Fluid (mL) = Max[(Sweat Loss − During Fluid), 0] × 1.25 × 1000

The calculator adjusts coefficients by goal, duration, intensity, meal size, digestion comfort, and recovery urgency. It is designed for planning, not medical treatment.

How to Use This Calculator

Enter the athlete weight in kilograms.
Select the exact training start date and time.
Choose session duration, goal, type, and intensity.
Set digestive sensitivity and preferred pre-workout meal size.
Enter expected sweat rate and time until the next session.
Press Calculate Meal Timing.
Review the timing table, totals, and fueling graph above the form.
Use the CSV or PDF buttons to save the result plan.

FAQs

1. What does this calculator estimate?

It estimates when to eat before training, whether to add a top-up snack, how much to fuel during exercise, and how to time recovery nutrition after the session.

2. Why does pre-workout meal size affect timing?

Larger meals need more digestion time. A bigger meal usually sits better when eaten earlier, while smaller snacks can fit closer to the workout start.

3. When are during-workout carbohydrates most useful?

They are most useful in sessions that are long, intense, or competition-like. Short, easy sessions often need less or no intra-workout carbohydrate.

4. Does this help strength athletes too?

Yes. Strength athletes may benefit from carbohydrate for training quality and protein around the session to support muscle repair and adaptation.

5. What if I train early in the morning?

Use a smaller pre-session snack if a full meal is not realistic. The calculator still gives a structured option based on your selected meal size.

6. Can I use this during a fat-loss phase?

Yes. The calculator tightens some portions for fat-loss goals while still protecting performance quality and post-session recovery needs.

7. Is the hydration estimate exact?

No. It is a planning estimate based on your expected sweat rate and workout length. Real hydration needs change with weather, clothing, and intensity.

8. Should I always eat right after exercise?

Not always immediately. Fast recovery matters more when the next session is soon. When recovery time is longer, the window can be more flexible.