Calorie Deficit Planner
Estimate a rough weight-loss timeline from a daily calorie deficit.
Turn a goal and deficit into a rough timeline
A calorie deficit planner helps set expectations before a cut starts. This tool asks for current weight, goal weight, and planned daily deficit, then uses the classic 3,500 calories per pound shortcut to estimate total deficit calories, days, and weeks.
For example, moving from 190 to 180 pounds at a 500 calorie daily deficit estimates 70 days, or about 10 weeks. Dropping the deficit to 250 calories doubles the estimate, which is useful when comparing aggressive and sustainable plans.
Use the estimate with caution
The 3,500 rule is easy to understand, but bodies are not spreadsheets. Scale weight can swing from sodium and glycogen, and energy needs can change as body weight and activity change. The output is a planning reference, not medical advice or a guarantee. Your inputs stay inside the browser. It is most useful for comparing scenarios before committing to one target.
Frequently Asked Questions
How does the deficit timeline work?
It multiplies pounds to lose by 3,500 calories, then divides by the planned daily deficit to estimate days and weeks.
Is the 3,500 calorie rule exact?
No. It is a simple planning shortcut. Real progress changes with water weight, adherence, activity, and metabolic adaptation.
What daily deficit is reasonable?
Many people start with a moderate deficit such as 250 to 500 calories per day, but medical needs and minimum intake vary.
Is my goal data stored?
No. The calculation runs locally in the browser and does not save or upload your numbers.
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