Adjustment after a few weeks
Second calculator
After at least two weeks, compare what happened to your weight with how much you ate on average. From the difference you can estimate your real expenditure and adjust the intake range. This is a simplification: with fast weight loss, part of the weight is water and muscle.
Fill in the weights (30 to 400 kg), the number of days (at least 14) and the average intake (500 to 6,000 kcal).
During pregnancy, breastfeeding, insulin treatment or with an eating disorder, do not use this calculator and talk to a doctor.
Estimated real expenditure kcal
Adjusted intake range kcal
We raised the intake to a safe minimum. We do not recommend lower values.
The loss is faster than roughly 1% of body weight per week. Discuss this with your doctor.
With fast weight loss, part of the weight is water and muscle, so the expenditure estimate is approximate and the range wide.
Simplification: 1 kg of body weight is taken as roughly 7,700 kcal. Information tool, not medical advice. The data you enter is never sent or stored.