Weight Loss Calculator

Estimate how many weeks it will take to reach your target weight loss figure, along with a suggested daily calorie intake.

About This Tool

Losing weight safely and sustainably requires an understanding of your daily calorie needs and how they relate to your goals. This weight loss calculator uses your sex, age, height, current weight, and activity level to estimate your Total Daily Energy Expenditure (TDEE). From there, it applies a healthy calorie deficit to determine how quickly you can expect to lose weight. Because one kilogram of body mass is roughly equivalent to 7700 calories, the tool can estimate your weekly rate of loss and the number of weeks needed to reach your target weight.

To use the weight loss calculator, enter your personal details and select your activity level. The tool uses the Mifflin–St Jeor equation to estimate your Basal Metabolic Rate (BMR), then multiplies it by an activity factor to determine your TDEE. A calorie deficit is then applied based on your activity level, reflecting a safe and sustainable rate of fat loss.

The result is an estimate of your weekly weight loss and the total number of weeks required to reach your target. Individual results vary based on metabolism, training intensity, and nutrition quality.

Remember, you should always seek professional advice before making significant changes to your diet or exercise level, especially if you have known health issues.

Sample Weight Loss Timelines

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