How Much Weight Can You Lose in a Month in a Healthy Way
Renzy
May 21, 2026 · 7 min read
Quick answer
The healthy and sustainable rate is losing 0.5-1% of your body weight per week — about 2-4 kg per month for an 80 kg person. The first week typically drops more (2-3 kg) due to water and glycogen loss, not fat. Losing faster consistently tends to cost muscle mass and promotes rebound weight gain. The more fat you have to start with, the faster you can lose initially.
Everyone wants to know the same thing: how much can I lose in a month? The honest answer is not what miracle diets sell, but it is much better news: at a moderate rate you lose actual fat, preserve muscle and do not rebound. Here you will find what is realistic, why the scale lies the first week and how to tell whether you are losing fat or just water.
Stop doing the math. Renzy does it for you.
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The right question is not "how much can I lose" but "how much can I lose without losing muscle or rebounding". And there science is clear: moderate pace wins over fast in almost everything that matters.
Healthy rate by body weight
Healthy monthly loss (0.5-1% of weight per week)
Your weight
Per week
Per month
60 kg
0.3-0.6 kg
1.2-2.4 kg
80 kg
0.4-0.8 kg
1.6-3.2 kg
100 kg
0.5-1.0 kg
2-4 kg
120 kg
0.6-1.2 kg
2.4-4.8 kg
How to lose fat, not muscle
Moderate deficit (300-500 kcal), not extreme
High protein: 1.6-2.2 g/kg to protect muscle
Strength training 3 times per week
Sleep 7-9 hours (rest protects muscle)
Patience: fat leaves at a limited rate no matter how hard you push
Renzy tracks the TREND of your weight, not the daily reading, and cross-references it with your intake so you know whether your rate is healthy or you are over-restricting.
Scan your food with a photo. Calories, macros and micronutrients in 3 seconds.
Forget promises of "10 kg in a month". Aim for a moderate rate, secure your protein and your strength, and track the trend with Renzy. You will lose real fat and, more importantly, you will not get it back.
Renzy calculates all of this for you
Scan your food with a photo. Calories, macros and micronutrients in 3 seconds.
1The essentials: (1) healthy rate is 0.5-1% of body weight per week (2-4 kg/month for an 80-100 kg person); (2) the big first-week drop is water, not fat; (3) moderate deficit + protein + strength lose fat without muscle and prevent rebound.
Frequently asked questions
How much is healthy to lose per month?▼
Between 0.5% and 1% of your body weight per week — about 2-4 kg per month for an 80 kg person, or 1.5-3 kg for a 65 kg person. The more body fat you start with, the faster you can lose initially without risk; the closer you are to your goal, the slower and more careful you should go.
Why did I lose 3 kg the first week?▼
Almost all of it is water, not fat. When you reduce calories and carbohydrates, you deplete glycogen stores, which retain a lot of water (each gram of glycogen carries about 3 g of water). It is a real drop on the scale but a misleading one: actual fat loss starts afterwards and is slower and steadier.
Is it bad to lose weight very fast?▼
When it is very aggressive and sustained, yes: you tend to lose more muscle, your metabolism adapts downward, hunger increases and the risk of rebound spikes. Very rapid losses also usually come from unsustainable diets you give up. Going slower preserves muscle and makes results last.
How do I know if I am losing fat or muscle?▼
Signs you are losing fat well: dropping at a moderate pace, maintaining strength at the gym, eating enough protein and clothes fitting better even when the scale moves slowly. If you are losing strength, feeling exhausted and the scale is plunging, you are probably losing muscle. High protein and strength training protect it.
Is the scale the best way to measure progress?▼
Not on its own. Weight fluctuates daily due to water, salt, glycogen and digestion. Use the weekly trend (average of several weigh-ins), not a single reading. Combine it with waist measurements, photos every 4 weeks and how clothes fit. Together they tell a more accurate story than one number alone.
Nutritional information and health calculations in Renzy are for informational purposes only and are based on recognized scientific sources (USDA Food Database, ESPEN, WHO). They do not replace professional advice from a qualified doctor, nutritionist, or dietitian. Always consult a health professional before changing your diet or following medical recommendations.
