Weight Loss Calculator

A sustained calorie deficit leads to fat loss over time.

How the Math Works

The Weight Loss Calculator uses the formula: loss = deficit × days ÷ 7700 kcal/kg. Here, 'deficit' represents your daily calorie deficit (calories burned minus calories consumed), and 'days' is the duration of your deficit. The number 7700 kcal/kg is the approximate energy content of 1 kilogram of body fat. By multiplying the daily deficit by the number of days, you calculate total energy deficit, which is then divided by 7700 to convert it into kilograms of fat loss. This formula provides an estimate based on the principle that a sustained calorie deficit leads to fat loss.

Practical Applications

To use this calculator, first determine your daily calorie deficit by subtracting your daily caloric intake from your daily energy expenditure. Enter this deficit and the number of days you plan to maintain it. For example, a 500 kcal daily deficit over 30 days would yield (500 × 30) ÷ 7700 ≈ 1.95 kg of fat loss. This tool helps you project weight loss outcomes, set realistic goals, and adjust your diet or exercise routine to achieve desired results. Note that individual results may vary due to factors like metabolism, muscle gain, or water retention.

Day-to-Day Use

This calculator aids daily decision-making by translating small, manageable changes into tangible outcomes. Tracking your deficit and projected loss helps you stay motivated and accountable. For instance, reducing your daily intake by 250 kcal and adding 250 kcal of exercise creates a 500 kcal deficit, which the calculator shows can lead to ~2 kg loss monthly. Understanding this connection encourages consistency in healthy habits, while adjusting inputs based on progress ensures your plan remains effective and sustainable over time.

Worked example

500 kcal/day for 30 days → about 1.95 kg.

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