Calculator Inputs
Formula Used
Mifflin St Jeor: Men = 10W + 6.25H - 5A + 5. Women = 10W + 6.25H - 5A - 161.
Revised Harris Benedict: It uses weight, height, age, and sex to estimate resting energy needs.
Katch McArdle: BMR = 370 + 21.6 × lean body mass in kilograms.
Total daily energy: TDEE = BMR × activity factor.
Goal calories: Target calories = TDEE × goal adjustment.
Macro grams: Protein and carbs use 4 calories per gram. Fat uses 9 calories per gram.
Fiber: Fiber target = 14 grams per 1,000 calories.
Weight change estimate: Weekly calorie balance ÷ 7,700 gives approximate kilograms per week.
How To Use This Calculator
- Enter your sex, age, weight, and height.
- Choose a BMR formula. Use Katch McArdle only when you know body fat.
- Select your activity level and diet goal.
- Choose a macro style or create a custom split.
- Enter meals per day for per-meal targets.
- Press calculate. Results will appear above the form.
- Use the chart to compare macro calorie shares.
- Download CSV or PDF for tracking and sharing.
Example Data Table
| Goal | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|
| Fat loss | 2,000 | 150g | 200g | 67g |
| Maintenance | 2,350 | 176g | 235g | 78g |
| Muscle gain | 2,600 | 195g | 260g | 87g |
Macro Diet Planning Guide
What A Macro Diet Means
A macro diet is a plan built around protein, carbohydrates, and fats. These nutrients provide energy. They also support recovery, hormones, and daily performance. A useful target starts with body size and age. It also uses sex, activity, and the goal. It should not copy another person’s plan. Your needs can change when training volume changes. Sleep and stress can change needs too.
Calories And Macro Balance
Calories set the size of the plan. Macros decide how those calories are shared. Protein helps protect lean mass. Carbohydrates fuel hard sessions and busy days. Fat supports hormones, cell function, and food satisfaction. Fiber and water improve fullness and digestion. This calculator combines these parts in one view. The plan becomes easier to adjust.
Choosing A Goal
Use maintenance calories when weight is stable. Use a small deficit for fat loss. Use a small surplus for muscle gain. Extreme changes can reduce adherence. They can also make training feel harder. A slower plan often works better. Meals stay realistic. Weekly balance gives a useful direction. It is still an estimate.
Building Better Meals
The best macro plan also matches food habits. Choose foods you enjoy. Include lean proteins, grains, beans, fruits, and vegetables. Add nuts, seeds, and healthy oils. Spread protein across meals. Keep fiber steady. Drink enough water before thirst becomes strong. Review progress every one or two weeks. Then adjust calories or activity in small steps.
Tracking Progress
Tracking should be simple and repeatable. Weigh foods when accuracy matters. Use hand portions when meals are routine. Compare weekly averages, not single days. Body weight can shift from water. Salt, carbs, soreness, and sleep can affect it. Photos and waist measurements add context. Energy and gym performance matter too.
Flexible Meal Planning
Use the meal split as a guide. You can move grams between meals. Keep the daily total close. This helps social meals fit better. It also reduces stress during busy weeks. Small changes protect consistency and long term progress.
Health Reminder
Remember that macro targets are planning tools. They are not medical treatment. Complex health needs require qualified professional guidance. For most healthy adults, this tool gives a clear start. Track results, compare goals, and improve the plan over time.
FAQs
1. What are macros?
Macros are protein, carbohydrates, and fats. They provide calories and support different body functions. Protein supports muscle repair. Carbs provide quick energy. Fat supports hormones and helps meals feel satisfying.
2. Which formula should I choose?
Mifflin St Jeor works well for many adults. Harris Benedict is another common estimate. Katch McArdle can be useful when you know your body fat percentage.
3. Are these results medical advice?
No. The calculator gives planning estimates. People with medical conditions, pregnancy, eating disorder history, or prescribed diets should ask a qualified health professional before changing calories.
4. How often should I update macros?
Review your macros every one or two weeks. Adjust when weight, training, hunger, energy, or progress changes. Small updates are usually easier to follow.
5. Why is protein shown per kilogram?
Protein per kilogram helps compare intake with body size. Larger people usually need more total protein. This value makes the target easier to judge.
6. Can I use custom macro percentages?
Yes. Select custom split and enter protein, carb, and fat percentages. They must total 100%. The calculator then converts those percentages into grams.
7. Why does water change with training?
Training increases sweat and fluid needs. The calculator adds a small training-based estimate. Heat, humidity, sodium intake, and sweat rate can change your true need.
8. Is the weekly weight change exact?
No. It is an estimate based on calorie balance. Water, digestion, hormones, sodium, training stress, and tracking accuracy can change scale weight.