Calculator Inputs
Use negative weekly change values for fat loss and positive values for gaining phases.
Example Data Table
| Body weight | Current calories | Current macros | Target change | Actual change | Style | Adjusted calories | Adjusted macros |
|---|---|---|---|---|---|---|---|
| 75 kg | 2270 kcal | 160P / 250C / 70F | -0.40 kg/week | -0.10 kg/week | Carb bias | 1940 kcal | 160P / 190C / 60F |
| 82 kg | 2850 kcal | 180P / 340C / 80F | +0.25 kg/week | +0.05 kg/week | Balanced split | 3070 kcal | 180P / 370C / 90F |
These rows show how the calculator converts trend gaps into daily calorie changes, then redistributes those calories into updated macro targets.
Formula Used
1) Daily calorie adjustment
Daily Adjustment = ((Target Weekly Change − Actual Weekly Change) × 7700) ÷ 7
2) Adjusted calorie target
Adjusted Calories = Current Calories + Daily Adjustment
3) Macro calorie values
Protein Calories = Protein × 4
Carbohydrate Calories = Carbs × 4
Fat Calories = Fat × 9
4) Protected fat floor
Minimum Fat = Body Weight × Fat Floor per kg
5) Projected weekly change
Projected Weekly Change = Actual Weekly Change + ((Rounded Calorie Change × 7) ÷ 7700)
How to Use This Calculator
- Enter your body weight, current calories, and average daily macros.
- Add your desired weekly change and your actual recent weekly trend.
- Choose whether protein should stay fixed or be set by body weight.
- Set a fat floor to protect minimum intake during harder cuts.
- Select an adjustment style to decide where calorie changes go.
- Press Calculate Adjustment to show the result above the form.
- Review the table, graph, and notes before updating your meal plan.
- Export the result as CSV or PDF for logging and coaching records.
FAQs
1) What does this calculator actually adjust?
It compares your actual weekly body-weight trend with your target trend. Then it estimates a daily calorie correction and redistributes those calories into updated macro targets.
2) Why does the calculator use 7700 kcal per kilogram?
That value is a common planning approximation for body-weight change. Real-world responses vary, so this tool should guide weekly adjustments rather than predict perfect outcomes.
3) Should I use daily weigh-ins or weekly averages?
Weekly averages are usually better. Daily weight fluctuates from sodium, hydration, training stress, digestion, and menstrual cycle changes, which can distort your true trend.
4) When should I keep protein fixed?
Keep protein fixed when your current intake already supports performance, satiety, and recovery. Use body-weight protein rules when you want a more structured target.
5) Why is there a minimum fat floor?
The fat floor helps prevent overly aggressive fat reductions during calorie cuts. That makes meal planning more practical and protects a minimum intake level.
6) Why might adjusted calories differ from my exact target?
Rounded macros can slightly change total calories. Protective constraints like minimum fat or zero-carb limits can also shift the final number away from the raw target.
7) Which adjustment style should most people use?
A carb-biased or balanced split usually works well because protein stays stable while carbs handle most training-related energy shifts. Choose the style that fits adherence.
8) Is this a medical or therapeutic nutrition tool?
No. It is a planning tool for general fitness nutrition. People with medical conditions, eating disorders, pregnancy, or clinical dietary needs should use professional guidance.