Calculator Inputs
Enter your details, choose a formula, and estimate a calorie target for fat loss planning.
Formula Used
Mifflin-St Jeor BMR:
Male: BMR = 10 × weight kg + 6.25 × height cm - 5 × age + 5
Female: BMR = 10 × weight kg + 6.25 × height cm - 5 × age - 161
Katch-McArdle BMR: BMR = 370 + 21.6 × lean body mass kg
TDEE: TDEE = BMR × activity factor
Daily deficit: Planned weekly loss kg × 7,700 ÷ 7
Target calories: TDEE - daily deficit, then checked against a basic safety floor.
Macros: protein and carbohydrates use 4 kcal per gram. Fat uses 9 kcal per gram.
How to Use This Calculator
- Enter age, gender, height, current weight, and goal weight.
- Select your normal activity level. Do not count one rare hard workout as your weekly lifestyle.
- Choose the BMR formula. Use Katch-McArdle only when you know your body fat percentage.
- Enter your planned weekly loss or add a custom calorie deficit.
- Set protein and fat preferences for macro planning.
- Press calculate. Review calories, macros, warnings, and charted progress.
- Download the CSV or PDF report for tracking.
Example Data Table
| Profile | Weight | Activity | Maintenance | Target | Expected Loss |
|---|---|---|---|---|---|
| Beginner male | 90 kg | Moderate | 2,800 kcal | 2,300 kcal | 0.45 kg/week |
| Active female | 72 kg | Very active | 2,450 kcal | 1,950 kcal | 0.45 kg/week |
| Sedentary male | 105 kg | Sedentary | 2,500 kcal | 1,900 kcal | 0.55 kg/week |
| Lightly active female | 82 kg | Light | 2,100 kcal | 1,650 kcal | 0.41 kg/week |
Target Calories for Weight Loss Guide
Why calorie targets matter
A weight loss target works best when it starts with maintenance needs. Your body uses energy for basic functions, movement, digestion, and training. When intake stays below maintenance, stored energy covers the gap. The calculator estimates that gap with BMR, activity, and planned loss rate. It then checks the target against practical safety floors.
Use a moderate deficit
Fast loss can look attractive, but it often reduces training quality, hunger control, and consistency. A moderate deficit is easier to repeat for many weeks. Many adults do well with ten to twenty five percent below maintenance. Very lean people usually need smaller deficits. People with more body fat may tolerate larger deficits for a short phase.
Watch the trend
Scale weight changes from water, food volume, salt, hormones, and stress. Do not judge the plan from one weigh in. Track several mornings and compare weekly averages. If the trend is flat for two or three weeks, reduce calories slightly or increase activity. If loss is too fast, add calories back.
Protein and macros
Protein helps protect lean mass while dieting. It also improves fullness. The calculator sets protein from body weight. Fat is set as a percentage of calories. Carbs receive the remaining energy. This split supports clear planning, but it can be adjusted for preference, culture, training style, and digestion.
Practical habits
Choose foods that make the target easier to follow. Build meals around lean protein, vegetables, fruit, beans, whole grains, and healthy fats. Keep treats planned instead of random. Drink water, sleep enough, and lift weights when possible. These habits help preserve muscle and keep hunger more predictable.
Review and adjust
No calculator can know your exact metabolism. Use the first result as a starting estimate. Review progress after fourteen to twenty one days. Small changes work better than extreme cuts. People who are pregnant, underweight, medically complex, or recovering from disordered eating should seek personal guidance.
Keep measurements simple. Use the same scale, similar clothing, and consistent logging. Accuracy improves when entries include cooking oils, drinks, sauces, snacks, and weekend meals, not only planned foods every single week.
FAQs
1. What is a target calorie intake?
It is the daily calorie amount designed to place you below maintenance. That deficit encourages gradual fat loss while still leaving energy for normal activity, training, and recovery.
2. Which BMR formula should I choose?
Use Mifflin-St Jeor for most cases. Use Katch-McArdle when you know a realistic body fat percentage, because it estimates needs from lean body mass.
3. Is a larger deficit always better?
No. A very large deficit can increase hunger, reduce training quality, and make adherence harder. Moderate deficits are usually easier to repeat consistently.
4. Why does the calculator use a safety floor?
The floor helps avoid very low calorie targets from aggressive goals. It is a general guardrail, not a personal medical recommendation or treatment plan.
5. How often should I adjust calories?
Review weekly averages after two or three weeks. Adjust only when the trend is clearly too slow, too fast, or difficult to maintain.
6. Do macros matter for weight loss?
Calories drive weight change, but macros affect fullness, energy, and body composition. Protein is especially useful while dieting because it supports lean mass.
7. Why is my scale weight not dropping daily?
Water, salt, stress, digestion, and hormones can hide fat loss. Compare weekly averages instead of judging one morning weigh in.
8. Can I use this while pregnant or medically unwell?
Do not rely on this calculator for pregnancy, illness, eating disorder recovery, or complex medical needs. Ask a qualified professional for personal guidance.