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Formula Used
The calculator estimates BMR first. Then it multiplies BMR by the activity factor. It adds extra exercise calories if entered. Then it applies the chosen goal change.
- Mifflin St Jeor: Men: 10W + 6.25H - 5A + 5. Women: 10W + 6.25H - 5A - 161.
- Revised Harris Benedict: Men: 88.362 + 13.397W + 4.799H - 5.677A. Women: 447.593 + 9.247W + 3.098H - 4.330A.
- Katch McArdle: BMR = 370 + 21.6 × lean body mass in kilograms.
- TDEE: BMR × activity factor + extra exercise calories.
- Target: TDEE plus the deficit, surplus, or custom change.
- Weekly change: Daily calorie difference × 7 ÷ 7700.
How to Use This Calculator
- Select your unit system first.
- Enter sex, age, weight, and height.
- Choose the formula that suits your data.
- Add body fat if you use Katch McArdle.
- Select an activity level that reflects normal weeks.
- Choose a goal or enter a custom calorie change.
- Set macro options for protein and fat.
- Press the calculate button and review the result.
Example Data Table
| Profile | BMR | Activity | Maintenance | Goal Target |
|---|---|---|---|---|
| Male, 30, 75 kg, 175 cm | 1,674 kcal | 1.55 | 2,594 kcal | 2,075 kcal for standard loss |
| Female, 28, 62 kg, 165 cm | 1,363 kcal | 1.375 | 1,874 kcal | 2,061 kcal for lean gain |
| Male, 42, 90 kg, 180 cm | 1,833 kcal | 1.2 | 2,200 kcal | 2,200 kcal for maintenance |
Understanding Your Daily Calorie Target
Calories are units of food energy. Your body uses them for breathing, thinking, moving, and repair. A good target starts with your base needs. Then it adjusts for activity and your chosen goal. This calculator follows that path. It first estimates resting burn. Then it scales the number by daily movement. After that, it adds a planned deficit or surplus. The final number is a practical eating target, not a fixed rule.
Why Personal Details Matter
Age, sex, height, and weight affect energy needs. Larger bodies usually burn more energy. Taller bodies often need more fuel. Younger adults often have higher resting needs. Activity changes the estimate even more. A desk job needs fewer calories than hard training. Small differences can change the target by hundreds of calories. That is why a detailed form gives better guidance.
Choosing the Right Goal
Maintenance means you eat near your total daily burn. Weight loss needs a steady deficit. Weight gain needs a steady surplus. A mild deficit is easier to follow. A large deficit can feel hard. It can also reduce training quality. A small surplus helps lean gaining. A large surplus may add fat faster. The best target is one you can repeat.
Using Macros With Calories
Calories set the main target. Macros shape the meal plan. Protein supports muscles and fullness. Fat supports hormones and food texture. Carbs fuel training and busy days. The calculator estimates grams from your choices. You can raise protein during fat loss. You can raise carbs during hard training. Keep the totals realistic. A simple plan is easier to track.
Common Tracking Mistakes
Many people forget drinks, oils, sauces, and weekend snacks. These items can change the week. Others choose an activity factor that is too high. Daily steps matter more than one hard workout. Food labels can also vary. Home portions can vary too. Use a kitchen scale when precision matters. Use relaxed estimates when life is busy.
When to Adjust Your Number
Keep the same target for enough time. One week is often too short. Two to four weeks show better trends. If weight stays flat during loss, reduce slightly. If weight drops too fast, add food. If gaining is too slow, add a small surplus. Change only one thing at a time. Clear records make each adjustment easier.
Reviewing Progress Safely
No calculator can know your exact metabolism. Use the result as a starting point. Track body weight for two to four weeks. Use the average, not one daily reading. Sleep, salt, stress, and water can shift weight. If progress is too slow, adjust slightly. If energy drops, adjust carefully. Medical needs require professional advice. Steady habits beat extreme targets. Remember that hunger can change daily. Training days may need extra food. Rest days may need less. Consistency across the whole week matters most for steady results.
FAQs
How many calories should I eat daily?
Your daily calories depend on body size, age, sex, activity, and goal. Use the calculator result as a starting target. Track progress for two to four weeks. Then adjust based on real changes.
Which formula should I choose?
Mifflin St Jeor is a strong default for most adults. Harris Benedict is another common option. Katch McArdle can help when you know a reasonable body fat estimate.
What is BMR?
BMR means basal metabolic rate. It estimates the calories your body burns at rest. It covers basic functions like breathing, circulation, and tissue repair.
What is TDEE?
TDEE means total daily energy expenditure. It estimates daily calorie burn after activity is included. It is the main number used for maintenance calories.
Can this help with weight loss?
Yes. Choose a loss goal to create a calorie deficit. A moderate deficit is often easier to follow. Very low targets should be discussed with a qualified professional.
Can this help with weight gain?
Yes. Choose a gain goal to create a calorie surplus. A smaller surplus is better for lean gaining. Pair it with strength training and consistent protein intake.
Why add extra exercise calories?
Use this field when your chosen activity level misses planned exercise. Keep it at zero if your activity factor already includes training and daily movement.
Are macro grams exact?
No. Macro grams are planning estimates. Protein uses grams per kilogram. Fat uses a percentage of calories. Carbs receive the remaining calories after those choices.
How often should I recalculate?
Recalculate after meaningful weight change, activity change, or goal change. Many people review targets every two to four weeks while tracking average progress.
Why is my target lower than expected?
A low target can come from smaller body size, low activity, or an aggressive deficit. Check inputs first. Then choose a milder goal if the target feels unrealistic.
Is this medical advice?
No. This tool gives general planning estimates. People with medical conditions, pregnancy, eating concerns, or strict diet needs should ask a qualified professional.