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Smart Macro Planning
This calculator helps you turn body data into a practical macro target. It is made for people who want a structured fitness plan without guessing. You enter age, sex, size, activity, training days, and goal details. The calculator estimates resting burn, daily burn, target calories, and macro grams.
The tool is not an official Katy Hearn product. It is an independent planning aid. It uses common nutrition math that many coaches use. Results should be reviewed with personal progress, hunger, energy, sleep, and training performance.
Why Macros Matter
Macros describe protein, fats, and carbohydrates. Protein supports lean tissue. Fat supports hormones and food satisfaction. Carbs support training output and recovery. Calories still drive weight change. Macro balance helps make those calories easier to follow.
An advanced macro plan should not use one fixed split for everyone. A lifter may need more protein. A runner may need more carbs. A person with a strong deficit may need careful fat limits. This calculator lets you adjust those inputs.
Using The Results
Start with the suggested calories for two weeks. Track body weight with a weekly average. Track workout performance too. If weight moves too fast, reduce the goal adjustment. If nothing changes, increase the adjustment slightly. Small changes are usually better than extreme cuts.
Protein is calculated from body weight in pounds. Fat is set as a calorie percentage. Carbs receive remaining calories. This method keeps the plan clear. It also avoids hidden calorie gaps.
Helpful Planning Tips
Use realistic activity levels. Most people overstate movement. Pick a lower activity setting when unsure. Add training days to estimate water needs and review consistency. Use the meal count to divide macros into daily portions.
Exports help with coaching notes. The CSV file works in spreadsheets. The PDF file is useful for saving a snapshot. Repeat the calculation after major weight changes. A five to ten pound change can shift calorie needs.
Log meals honestly, because accurate entries make each calorie target more useful during weekly reviews and coaching check ins.
Remember that macro targets are estimates. Stress, digestion, steps, cycle changes, and food accuracy all matter. Use the output as a starting point. Then adjust with evidence from real life.
Formula Used
Mifflin St Jeor: Male BMR = 10W + 6.25H - 5A + 5. Female BMR = 10W + 6.25H - 5A - 161.
Revised Harris Benedict: Male BMR = 88.362 + 13.397W + 4.799H - 5.677A. Female BMR = 447.593 + 9.247W + 3.098H - 4.330A.
Katch McArdle: BMR = 370 + 21.6 × lean body mass in kilograms.
TDEE: TDEE = BMR × activity factor.
Target calories: Fat loss subtracts the adjustment. Lean gain adds it. Maintenance keeps TDEE unchanged.
Macros: Protein calories = protein grams × 4. Fat calories = target calories × fat percentage. Carb calories fill the remainder.
How To Use This Calculator
- Select the unit system that matches your measurements.
- Enter age, gender, weight, height, and body fat if known.
- Choose the formula you prefer for resting calorie burn.
- Select activity level and training days honestly.
- Choose your goal and enter a careful adjustment percentage.
- Set protein rate, fat percentage, and meal count.
- Submit the form and review the result above the form.
- Download the CSV or PDF file for future tracking.
Example Data Table
| Profile | Goal | Activity | Calories | Protein | Fat | Carbs |
|---|---|---|---|---|---|---|
| Female, 150 lb, 65 in | Fat loss | Moderate | 1840 | 135 g | 51 g | 211 g |
| Male, 185 lb, 70 in | Lean gain | Very active | 3180 | 167 g | 88 g | 430 g |
| Female, 135 lb, 63 in | Maintenance | Light | 1900 | 122 g | 53 g | 234 g |
FAQs
Is this an official Katy Hearn calculator?
No. This is an independent macro planning calculator. It uses common calorie and macro formulas. It does not represent any official brand, coach, app, or program.
Which BMR formula should I choose?
Mifflin St Jeor is a good default. Katch McArdle can help when body fat percentage is known. Harris Benedict is useful for comparison.
What is a safe fat loss adjustment?
Many people start with 10 to 20 percent below TDEE. Larger deficits may reduce energy, hunger control, and training performance.
How much protein should I enter?
A common range is 0.7 to 1.0 grams per pound. Higher values may help during dieting, lifting, or lean mass goals.
Why are carbs calculated last?
Protein and fats are set first because they support key body needs. Carbs then receive remaining calories for training and energy.
Should I change macros every week?
Usually no. Track results for at least two weeks. Then adjust only when weight, measurements, or training trends support a change.
Can I use this for recomposition?
Yes. Choose recomposition and use a small adjustment. Progress may be slower, so track strength, photos, measurements, and body weight.
Why does my result show a warning?
A warning appears when protein and fat targets use more calories than allowed. Lower those settings or raise your calorie target.