What does this tool do?
A steady deficit produces predictable weight loss in the short term, though the rate slows as body weight falls. This calculator uses the 7,700 kcal per kilogram approximation to estimate a timeline from a daily deficit.
The Formula
Weeks = (Current weight − Target weight) × 7,700 ÷ (Daily deficit × 7)Frequently Asked Questions
Why is the timeline only an estimate?
Energy expenditure falls as you lose weight, and adherence varies. Real loss usually slows over time, so check progress every few weeks rather than daily.
Is a 500 kcal deficit safe?
A 500 kcal deficit is a common starting point that often produces about 0.5 kg per week. Individual needs vary, and very low intakes should be supervised.