Calorie Needs Calculator
Formula Used
Male BMR: 10 × weight kg + 6.25 × height cm − 5 × age + 5
Female BMR: 10 × weight kg + 6.25 × height cm − 5 × age − 161
TDEE: BMR × activity multiplier
Daily deficit: weekly loss goal kg × 7700 ÷ 7
Target calories: TDEE − daily deficit
Macros: protein and carbs use 4 calories per gram. Fat uses 9 calories per gram.
How to Use This Calculator
Choose your unit system first. Enter gender, age, height, and weight. Select the activity level that matches your average week. Add a realistic weekly weight loss goal. Adjust macro percentages if needed. Make sure protein, carbs, and fat equal 100 percent. Press the calculate button. The result will appear above the form.
Example Data Table
| Gender | Age | Weight | Height | Activity | Goal | Estimated Target |
|---|---|---|---|---|---|---|
| Male | 35 | 90 kg | 178 cm | Moderate | 0.5 kg weekly | About 2300 calories |
| Female | 30 | 72 kg | 165 cm | Light | 0.4 kg weekly | About 1600 calories |
| Male | 42 | 210 lb | 5 ft 10 in | Sedentary | 0.3 kg weekly | About 2100 calories |
Calorie Planning for Weight Loss
Why Calories Matter
Weight loss starts with energy balance. Your body uses calories each day. It uses them for breathing, movement, digestion, and repair. When intake stays below daily use, stored energy can fill the gap. This creates gradual fat loss. A calculator gives a practical starting point. It does not replace daily tracking. It helps you plan with structure.
What This Calculator Estimates
This tool estimates basal metabolic rate first. That number shows basic calorie use at rest. It then applies an activity multiplier. This gives total daily energy expenditure. Your selected loss goal creates a calorie deficit. The calculator subtracts that deficit from maintenance calories. It also estimates protein, carbohydrate, and fat grams from your macro split.
Choosing a Sensible Deficit
A smaller deficit is easier to follow. It may protect training energy. It may also reduce hunger. A larger deficit can move weight faster. It can also feel harder. Many people use a moderate target first. Then they review progress after two weeks. Weight can change from water, salt, sleep, and stress. Use weekly averages instead of one daily weigh in.
Using the Result Well
Your result is a guide. Start with the target for several days. Track food portions carefully. Keep protein high enough. Eat filling foods with fiber. Drink enough water. Keep activity stable. If weight does not change after two or three weeks, adjust slowly. A small change is usually better than a sudden drop.
Important Notes
Very low calorie targets are not ideal for everyone. Medical conditions, pregnancy, eating disorder history, medications, and intense training can change calorie needs. Ask a qualified health professional when unsure. Safe weight loss is steady, flexible, and sustainable.
FAQs
What is a calorie deficit?
A calorie deficit means you eat fewer calories than your body uses. The body can then use stored energy. This supports weight loss over time.
Which formula does this calculator use?
It uses the Mifflin St Jeor equation for BMR. Then it multiplies BMR by an activity factor to estimate maintenance calories.
How fast should I lose weight?
Many people aim for slow and steady progress. Around 0.25 to 1 kg weekly is common. Your best rate depends on health and lifestyle.
Why did my target calories increase automatically?
The calculator uses a minimum intake guard. This helps avoid very low targets from aggressive goals. It is still only an estimate.
Do activity levels change the result?
Yes. Higher activity raises estimated daily calorie use. Choose the level that matches your real weekly routine, not your best day.
Can I use pounds and feet?
Yes. Select the imperial option. The calculator converts pounds, feet, and inches into metric values before applying the formula.
Are macro grams required for weight loss?
No. Calories drive weight change first. Macros help with hunger, training, food quality, and consistency. Protein is especially useful.
Should I change calories every day?
Not usually. Use one target for a short period. Review weekly average weight. Adjust only when progress stalls for several weeks.