⚖️ CalToLbs

The Ultimate Calorie to Pounds Weight Loss Calculator (Scientifically Adjusted)

Estimate a personalized daily calorie target, weight-loss pace, and practical protein, fat, and carbohydrate ranges using your body measurements and goal.

🔥 The Ultimate Calorie to Pounds Weight Loss Calculator (Scientifically Adjusted)

Estimate a personalized daily calorie target, weight-loss pace, and practical protein, fat, and carbohydrate ranges using your body measurements and goal.

Your essentials

Start with five inputs. Nothing entered here leaves your browser.

Adults aged 18 to 100

Mifflin-St Jeor uses a sex-specific constant

For example, 165 cm

For example, 75 kg

A slower target is generally easier to sustain

Interactive Visualization

Estimated Output

0
Scale max
— Waiting for input
Enter your values to calculate an estimate.

Uses your browser's print-to-PDF feature. Your entries stay on this device.

Method: Mifflin-St Jeor BMR × activity factor − goal deficit
Macros are planning estimates based on calorie target, body weight, optional body-fat percentage, and preference.

*Conversion calculations are based on thermodynamic body weight modeling. Adjust targets based on actual physical feedback.

❓ Frequently Asked Questions

You need a deficit of approximately 3,500 calories to lose 1 pound of body fat. This can come from eating less, exercising more, or a combination of both. A daily deficit of 500 calories leads to about 1 pound lost per week.
It's a useful estimate, but individual results vary based on metabolism, body composition, and hormone levels. Some people lose faster, others slower. Use this calculator as a guideline, not a guarantee.
A 1,000 calorie daily deficit (7,000 per week) typically results in 2 pounds lost per week. Most health experts consider this the maximum safe rate. Faster loss may lead to muscle loss and nutrient deficiencies.
For most adults, a 300-500 calorie daily deficit is sustainable and healthy. This leads to 0.5-1 pound lost per week. Very low calorie diets (under 1,200 calories for women, 1,500 for men) should only be done under medical supervision.

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カロリーと体脂肪の背後にある科学

ウィシュノフスキーの法則と熱力学の第一法則

体重の変化は生体エネルギーのバランスによって決まります。ウィシュノフスキーの法則によれば、約 3,500 カロリーのエネルギー不足または余剰は、1 ポンドの脂肪組織 (体脂肪) の蓄積に相当します。これは熱力学の第一法則の応用です。エネルギーは生成も破壊もできず、脂肪として蓄えられるか、代謝のために燃焼されるだけです。

Interactive Calorie Energy and Body-Mass Equivalent

Adjust the slider to compare calorie energy with the historical static body-fat equivalent; kilograms and kilocalories remain separate conservation units.

⚡ Energy
⚖️ Mass

3,500 kcal

Energy In

1.00 lbs

Fat Stored
0 kcal 7,000 kcal 14,000 kcal
Adipose

Static Energy-Equivalent Model

In the historical static model, 3,500 kcal represents an estimated one-pound energy equivalent, not an exact biological outcome.

📉 カロリー不足とカロリー過剰を理解する

体重を減らすには、摂取量が 1 日の総エネルギー消費量 (TDEE) を下回るカロリー不足 (負のエネルギー バランス) を作り出す必要があります。逆に、筋肉の増強や体重増加にはカロリー余剰（プラスのエネルギーバランス）が必要です。当社のコンバーターは、これらのエネルギー目標を体重ポンドに直接マッピングするのに役立ちます。

Core Biological Entities Defined

  • ✔ Adipose Tissue: The anatomical term for body fat, which stores chemical energy.
  • ✔ TDEE: Total Daily Energy Expenditure represents the total calories burned in 24 hours.
  • ✔ Wishnofsky's Rule: The historical approximation that treats 3,500 kcal as a one-pound energy equivalent, not a guaranteed tissue change.

Interactive Calorie Balance Visualizer

Adjust your TDEE and daily intake to visualize calorie balance states and the physiological processes involved.

2,000 kcal
1,500 kcal 4,000 kcal
1,500 kcal
500 kcal 5,000 kcal
Current State

Calorie Deficit

Lipolysis (Fat Loss)

Your calorie intake is below your TDEE. Your body metabolizes stored triglyceride lipids from adipose tissue to satisfy its energy needs.

Net Energy Change

-500 kcal/day

Weekly Mass Change

-1.00 lbs

Interactive Weight Loss Timeline

Select a target weight and daily calorie deficit to map your progress milestones along a biological timeline.

Target Weight:
500 kcal / day
200 kcal 1,500 kcal (Advanced)

Total Deficit Required

35,000 kcal

Days to Achieve

70 Days

Expected Target Date

September 5, 2026

1
Start Day 0
2
Halfway Day 35
3
Goal Day 70