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Losertown Calorie
Calculator

Calculate your daily calorie needs and project your weight loss over time. Enter your stats below to see a personalized week-by-week weight projection.

100% FreeNo Data StoredInstant Results
cm
kg
kg
cal/day
4 weeks52 weeks
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How the Losertown Calculator Works

Three simple steps to project your weight loss journey week by week.

Enter Your Stats

Provide your age, gender, height, current weight, and activity level for an accurate BMR and TDEE calculation.

Set Your Goal

Choose your goal weight and optional daily calorie target. Adjust the projection timeline from 4 to 52 weeks.

See Your Projection

Get a full week-by-week weight projection chart with BMR, TDEE, and estimated time to reach your goal weight.

Understanding Calorie Deficits & Weight Loss

This calculator uses the Mifflin-St Jeor equation to estimate your Basal Metabolic Rate (BMR), then multiplies it by an activity factor to determine your Total Daily Energy Expenditure (TDEE). The difference between your TDEE and calorie intake drives weight change.

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

How the projection works:

The weight projection uses the widely accepted model that a 3,500-calorie deficit equals approximately one pound of fat loss. Each week, the calculator recalculates your BMR and TDEE at your new projected weight to account for metabolic adaptation — as you lose weight, your body burns slightly fewer calories, which gradually slows the rate of loss. This adaptive recalculation makes the projections more realistic than tools that assume a constant rate.

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Frequently Asked Questions

Common questions about calorie deficits, weight loss projections, and the Losertown calculator.

The Losertown calorie calculator is a weight loss projection tool originally hosted at losertown.org. It uses the Mifflin-St Jeor equation to estimate your BMR, applies an activity multiplier for TDEE, and projects your weight week by week based on your calorie intake. Our version at CalcFirst provides the same calculation with a modern interface and metabolic adaptation modeling.
A calorie deficit means you consume fewer calories than your body burns each day. When this happens, your body taps into stored energy (primarily fat) to make up the difference. A daily deficit of 500 calories produces roughly 1 pound of fat loss per week, based on the widely accepted model that 3,500 calories equals one pound of body fat.
The Mifflin-St Jeor equation is considered the most accurate BMR formula for the general population, predicting measured BMR within 10% for about 80% of people. However, real-world weight loss depends on additional factors including water retention, hormonal fluctuations, adherence to calorie targets, and changes in exercise habits. Use the projections as a realistic guide, not a guarantee.
To lose weight safely, eat fewer calories than your TDEE while staying above minimum thresholds. Most health professionals recommend women consume no fewer than 1,200 calories and men no fewer than 1,500 calories per day without medical supervision. A moderate deficit of 500-750 calories per day results in 1-1.5 pounds of weight loss per week, which is the sustainable standard.
As you lose weight, your body requires fewer calories to maintain itself because there is less tissue to support. This means your BMR and TDEE decrease, and the same calorie intake produces a smaller deficit over time. This calculator accounts for this metabolic adaptation by recalculating your BMR and TDEE at each projected weight, giving you more realistic long-term projections.

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