Calorie deficit calculator
Roughly how long to a goal weight at a steady calorie deficit, never faster than 1 % of your weight a week. Free, nothing leaves your browser.
Your timeline
—weeks, roughly
Enter your weight, goal and height.
Fabee counts every meal against your daily number.
DownloadFor adults 18 and over, not medical advice. Pregnant, breastfeeding, with a history of eating disorders or a health condition? Talk to a professional first.
How it works
About 7,700 calories make up a kilogram of body weight (3,500 per pound). Divide what you want to lose by your weekly deficit and you get a rough number of weeks.
It never plans more than 1 % of your body weight a week, and never a goal under a BMI of 18.5. Real loss slows over time, and weight jumps day to day with water.
Sources: Hall et al., Quantification of the effect of energy imbalance on bodyweight, Lancet 2011.
Why am I not losing weight in a calorie deficit? The full guide →