Ideal weight calculation

There is no single universal ideal weight. We provide 3 estimations based on recognized formulas, plus an average. See where you feel your best.

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The 3 formulas explained

Devine Formula (1974): the simplest and most common in medical settings. It only takes height and gender into account.

Lorentz Formula (1929): older but still used. It differentiates between men and women with a specific calculation for each gender.

Creff Formula: the most complete as it integrates age and morphology (wrist circumference). It generally gives the most realistic result for people over 40.

Why are the results different?

Each formula uses different variables. Devine and Lorentz ignore age and morphology — they are less precise for people who fall outside the "norm." Creff is more nuanced but requires more data.

The average of the 3 formulas gives you a realistic range. If your 3 results are close, you have a reliable estimate. If they diverge significantly, it means your morphology is atypical and should be interpreted with caution.

Ideal weight is just a guide

These formulas don't know your muscle mass, your actual health, or your well-being. An athlete will naturally be above their calculated "ideal weight."

The true ideal weight is the one where you feel good, sleep well, have energy, and your blood work is good. Use these numbers as a reference, not an absolute goal.

Questions fréquentes

Which formula is the most reliable?
The Creff formula is generally the most realistic as it takes age and morphology into account. However, no formula is perfect — they provide estimates, not prescriptions.
Can my ideal weight change with age?
Yes. With age, muscle mass naturally decreases and metabolism slows down. Formulas like Creff take this into account. An "ideal" weight at 25 isn't the same as at 55.
I am muscular, are these formulas suitable?
No. These formulas are designed for the general population. If you have higher-than-average muscle mass, your "normal" weight will naturally be higher than the estimates.
Should I aim for exactly this weight?
No. Aim for a range of ±3 kg around the average. Weight naturally fluctuates by 1-2 kg per day (water, digestion). What matters is the trend over several weeks.

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