Weight Loss Timeline Calculator
Wondering how long it will take to hit your target weight? Enter your current weight, goal weight, and daily calorie deficit to estimate your timeline. Results are simple projections based on the 3,500-calorie-per-pound rule.
How it works
This calculator uses the widely cited rule that roughly 3,500 calories equals one pound of body fat. First it finds the pounds you want to lose (current weight minus goal weight), then multiplies by 3,500 to get the total calorie deficit required.
It divides that total by your daily calorie deficit to estimate the number of days, then converts to weeks and projects a goal date. Weekly loss is calculated as (daily deficit × 7) ÷ 3,500.
Tips
A sustainable rate is generally 0.5–2 lbs per week, which corresponds to a daily deficit of about 250–1,000 calories. Aggressive deficits can backfire by reducing energy and muscle.
Weight loss is rarely perfectly linear — water weight, hormones, and metabolic adaptation all play a role. Use this timeline as a motivating estimate, not a guarantee.
FAQ
Is the 3,500 calories per pound rule accurate?
It is a useful rule of thumb but a simplification. Real fat loss varies with metabolism, muscle mass, and adaptation over time, so treat results as approximate.
What's a safe daily calorie deficit?
Most experts suggest a deficit of 250–1,000 calories per day, producing about 0.5–2 lbs of loss per week. Always consult a healthcare provider before large changes.
Why isn't my real progress matching the estimate?
Bodies adapt — metabolism can slow as you lose weight, and water retention or muscle gain can mask fat loss on the scale. Consistency over weeks matters most.