Daily Calorie Needs Calculator (TDEE)
Weight
Estimated daily energy needs from your BMR and physical activity level.
Weight Loss Timeline Calculator
A rough estimate of how long a steady calorie deficit takes to reach a goal weight.
Your result will appear here
Enter your measurements, then press Calculate.
Methodology
Energy-content rule (≈ 7700 kcal per kg of body weight)
weeks = (current − goal) ÷ (deficit × 7 ÷ 7700)
A simple rule that assumes each kilogram of body weight lost contains about 7700 kcal. Real weight loss slows over time as the body adapts, so this underestimates the time needed.
- Who it is for
- Adults aiming for gradual weight loss; not in pregnancy.
- Version
- 1.0.0
Worked example: how to calculate weight goal timeline
Inputs
- Current weight
- 90 kg
- Goal weight
- 80 kg
- Daily calorie deficit
- 500 kcal/day
Result
- Rough estimate
- 22 weeks
- Average loss per week (simple rule)
- 0.45 kg (≈ 1 lb)
An illustration with sample values, worked out with the same method the tool above uses.
Limitations
- Underestimates time: dynamic models (Hall 2011) show weight loss slows as weight falls.
- Very low calorie intakes need medical supervision.
References
- Hall KD, Sacks G, Chandramohan D, et al. Quantification of the effect of energy imbalance on bodyweight. Lancet. 2011;378(9793):826–837. doi:10.1016/S0140-6736(11)60812-X
Continue with your measurements
Shared measurements carry over automatically, in this tab only.
BMI Calculator
Weight
Calculate your body mass index and see the WHO adult category.
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Healthy Weight Range Calculator
The weight range that matches a BMI of 18.5–24.9 for your height.