GLP-1 Weight Loss Rate Calculator

Assess whether your weekly or monthly weight loss pace on GLP-1 therapy is too slow, optimal, brisk, rapid, or very rapid, with risks and clinical recommendations for each band.

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1 lbs/wk

Rate (lbs/week)

0.45 kg/wk

Rate (kg/week)

Optimal

Safety band

Optimal pace Your weight loss rate is within the recommended range for GLP-1 therapy. Steady losses of 0.25–1.5 lbs/week support preservation of lean muscle mass and minimise the risk of nutritional deficiencies.

Recommendations

  • →Maintain adequate protein intake (1.2–2.0 g/kg target body weight)
  • →Include resistance training to preserve lean muscle
  • →Stay hydrated and take any recommended supplements

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GLP-1 Safety

GLP-1 Weight Loss Rate Calculator — is your weight loss pace safe?

Losing weight too quickly on GLP-1 medication can increase the risk of muscle loss, gallstones, nutritional deficiencies, and "Ozempic face" (facial fat loss). This GLP-1 weight loss rate calculator assesses whether your current pace — in lbs or kg per week or month — falls in the optimal, brisk, rapid, or very-rapid safety band.

Optimal weight loss pace on GLP-1 therapy

Clinical guidelines from AACE and the Obesity Medicine Association recommend 0.5–1.5 lbs (0.23–0.68 kg) per week as the optimal pace for sustainable weight loss during GLP-1 therapy. This range balances fat loss with preservation of lean muscle mass and reduces the risk of nutritional deficiencies.

Losses of 2–3+ lbs per week are considered rapid and carry increased risks. Accelerated weight loss is a known risk factor for cholesterol gallstone formation (the gallbladder can't empty properly when fat intake drops sharply). It also increases the rate of lean muscle loss — sometimes called "skinny fat" — and can accelerate facial fat loss, colloquially termed "Ozempic face".

Protein intake and resistance training

GLP-1 medications strongly suppress appetite, making it difficult to meet protein targets. Inadequate protein accelerates lean muscle loss during rapid weight loss. The consensus recommendation for GLP-1 users is ≥1.2–2.0 g of protein per kg of goal body weight, spread across 3–4 meals.

Resistance training (strength training) is the most effective intervention for preserving lean muscle mass during GLP-1-driven weight loss. Even 2–3 sessions per week significantly reduces the proportion of muscle lost relative to fat.

Frequently asked questions

What is "Ozempic face"?

Ozempic face refers to facial hollowness and sagging caused by rapid fat loss from the face and neck. It is not unique to Ozempic — it can occur with any rapid weight loss. Slower, gradual weight loss reduces but does not eliminate this effect. Maintaining adequate protein and resistance training helps.

 Is 3 lbs a week on Wegovy too fast?

Yes — 3 lbs/week is in the "rapid" band (>2.5 lbs/week). At this pace, the risk of muscle wasting, gallstones, and nutritional deficiencies increases meaningfully. Discuss dose adjustment and dietary strategy with your prescribing clinician.

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