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Calorie Deficit Planner - Online Weight Loss Timeline Tool

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Calorie Deficit Planner

Calculate your weight loss timeline based on daily calorie deficit

Quick Deficit Calculate Deficit
Body Stats
kg
kg
cm
Current BMI —
Target BMI —
Daily Calorie Deficit
500 kcal/day
100 500 1000 1500
Custom: kcal/day
Calculate Your Deficit
kcal
What you eat daily
kcal
Calories you burn daily
Calculated Deficit: 500 kcal/day
13.0 kg
Total Weight Loss
100,100 kcal
Total Deficit Needed
200 days
Estimated Duration
—
Target Date
Healthy Rate: ~0.45 kg/week
Weight Loss Timeline
Weekly Weight Forecast
Week Date Est. Weight Loss This Week Total Loss Progress
Tips for Success
  • A sustainable deficit of 500 kcal/day leads to ~0.45 kg (1 lb) loss per week
  • Combine diet and exercise for best results — don't rely on diet alone
  • Track your food intake accurately — use a food scale for the first 2 weeks
  • Stay hydrated and prioritize protein to preserve muscle mass during weight loss
  • Recalculate every 4-6 weeks as your TDEE decreases with weight loss
Frequently Asked Questions
A calorie deficit occurs when you consume fewer calories than your body burns in a day. Your body then turns to stored fat for energy, resulting in weight loss. Approximately 7,700 calories of deficit equals 1 kg of fat loss (or 3,500 calories per pound). This is known as the "3500-calorie rule" and is the foundation of most weight loss planning.
Health experts recommend losing 0.5–1 kg (1–2 lbs) per week for sustainable, healthy weight loss. This requires a daily calorie deficit of 500–1000 kcal. Faster weight loss can lead to muscle loss, nutrient deficiencies, fatigue, and a higher chance of regaining the weight. Very low-calorie diets should only be undertaken under medical supervision.
A 500 kcal daily deficit is considered the "sweet spot" — it's substantial enough to produce meaningful results (~0.45 kg or 1 lb per week), yet sustainable enough that most people can maintain it without extreme hunger or fatigue. It can often be achieved through a combination of modest dietary changes and increased physical activity, making it practical for long-term adherence.
The 3500-calorie rule is a useful estimate but has limitations. As you lose weight, your metabolism adapts — your TDEE decreases because a smaller body burns fewer calories. Additionally, not all weight lost is pure fat; some may be water or muscle. For best results, recalculate your deficit every 4–6 weeks based on your new weight and adjust accordingly. Think of this planner as a starting guide, not an exact prediction.
BMR (Basal Metabolic Rate) is the number of calories your body needs at complete rest — just to keep your organs functioning. TDEE (Total Daily Energy Expenditure) includes BMR plus all activity: walking, exercise, digestion, and even fidgeting. For weight loss planning, always use TDEE as your baseline, as it reflects your actual daily calorie burn.
Yes, weight loss is primarily driven by a calorie deficit, which can be achieved through diet alone. However, combining diet with exercise offers significant advantages: it preserves muscle mass, boosts metabolism, improves cardiovascular health, and makes it easier to maintain the deficit. Plus, exercise provides endorphins that improve mood and motivation during your weight loss journey.
Weight loss plateaus are normal and expected. As you lose weight, your body requires fewer calories to maintain itself — a lighter body has a lower TDEE. The same 500 kcal deficit that produced 0.45 kg/week at 85 kg might only produce 0.35 kg/week at 75 kg. To break through plateaus, periodically reassess your TDEE, adjust your intake, or increase activity levels.
While perfect accuracy isn't necessary, studies show that most people underestimate their calorie intake by 20–40%. Using a food scale for at least the first 2 weeks dramatically improves accuracy. After that, you'll develop better portion estimation skills. Aim for consistency over perfection — being 80% accurate consistently yields better results than being 100% accurate only occasionally.

This tool provides estimates based on the 7,700 kcal/kg (3,500 kcal/lb) rule. Individual results vary. Consult a healthcare professional before starting any weight loss program.

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