What is the Losertown Calculator?
The Losertown Calculator is a weight loss projection tool that calculates your BMR (Basal Metabolic Rate), TDEE (Total Daily Energy Expenditure), and provides a realistic weekly timeline for achieving your goal weight using a calorie deficit approach with metabolic adaptation modelling.
How does the weight loss timeline work?
Our calculator uses the Mifflin-St Jeor equation to determine your BMR, multiplies it by your activity level to get your TDEE, then subtracts your chosen calorie deficit. The timeline includes adaptive slowdown to account for metabolic adaptation as you lose weight, providing more realistic projections than simple linear calculations.
What is BMR and how is it calculated?
BMR (Basal Metabolic Rate) is the number of calories your body burns at rest. We use the Mifflin-St Jeor equation, which is considered one of the most accurate: For men: (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5. For women: (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161.
What is TDEE and why does it matter?
TDEE (Total Daily Energy Expenditure) is the total number of calories you burn in a day, including exercise and daily activities. It's calculated by multiplying your BMR by an activity factor. TDEE is crucial because it tells you how many calories you need to maintain your current weight, which is the baseline for creating a calorie deficit.
How many calories should I cut to lose 1 stone?
One stone (14 pounds or approximately 6.35 kg) requires a total deficit of about 44,000-49,000 calories. At a moderate 500 calorie daily deficit, you'd lose roughly 1 stone in 12-14 weeks. However, individual results vary based on metabolic factors, adherence, and body composition.
What is a safe weekly weight loss rate in the UK?
Health experts recommend losing 0.25–1.0 kg (0.5–2 lb) per week for sustainable, healthy weight loss. More aggressive deficits can lead to muscle loss, nutrient deficiencies, and metabolic slowdown. Our calculator helps you choose a deficit that keeps you within safe guidelines whilst progressing towards your goal.
Why does the projection curve slow down over time?
As you lose weight, your BMR decreases because a lighter body requires fewer calories. Additionally, your body undergoes metabolic adaptation, becoming more efficient at using energy. Our calculator accounts for this by recalculating your BMR weekly, providing a more realistic "adaptive" projection rather than an unrealistic straight-line estimate.
Can I use stones and pounds instead of kilograms?
Absolutely! Our calculator is optimised for UK users and supports both imperial units (stones, pounds, feet, and inches) and metric units (kilograms and centimetres). Simply select your preferred unit system from the dropdown, and all inputs and outputs will update accordingly.
What's the difference between this and other calorie calculators?
Unlike basic calculators that show linear projections, our tool includes metabolic adaptation modelling, meaning the timeline adjusts as your weight decreases. We also provide UK-specific units (stones/pounds), a visual projection chart, detailed weekly timeline table, CSV export, and shareable links—all whilst being mobile-optimised and accessible.
How accurate is the calorie deficit calculator?
The calculator uses scientifically validated equations (Mifflin-St Jeor for BMR), but individual results vary due to factors like genetics, hormones, sleep, stress, and adherence. Treat these projections as informed estimates rather than guarantees. Regular monitoring and adjustments based on actual progress are recommended.