CalculynQuick answer
Losing 25 lb at a 500 kcal/day deficit takes about 175 days, or 25 weeks — roughly 1 lb per week.
How it works
A pound of body fat stores roughly 3,500 calories. Dividing the total you need to burn by your daily deficit gives an estimate — real progress varies with water weight, metabolism and adherence.
Formula
Days = Pounds to lose × 3,500 ÷ Daily deficit
Assumptions & limitations
- Results are rounded for display.
Frequently asked questions
What's a safe rate of weight loss?
Most guidelines suggest 0.5–2 lb per week (a 250–1,000 kcal daily deficit). Faster loss risks muscle loss and is harder to sustain.