How Fast Can You Lose Weight Safely? Realistic Timelines
How fast you can lose weight safely: about 0.5–1% of body weight per week. See realistic timelines for 5, 10 and 20 kg and why the first week is faster.
By Ayoub Farid · · 2 min read
Most people want to know "how long will this take?" before they start. The honest answer depends on your starting weight and how big your deficit is, but realistic ranges help you set expectations and avoid crash diets.
Key takeaways
- A safe, realistic pace is about 0.5–1% of body weight per week.
A safe, realistic pace
A common guideline is to lose about 0.5–1% of your body weight per week, or roughly 0.25–1 kg (0.5–2 lb) per week. People with more weight to lose usually lose faster at first.
| Starting weight | 0.5% per week | 1% per week |
|---|---|---|
| 60 kg | 0.3 kg | 0.6 kg |
| 80 kg | 0.4 kg | 0.8 kg |
| 100 kg | 0.5 kg | 1.0 kg |
| 120 kg | 0.6 kg | 1.2 kg |
Example timelines (at ~0.5 kg per week)
| Goal | Rough time |
|---|---|
| Lose 5 kg (11 lb) | ~10–12 weeks |
| Lose 10 kg (22 lb) | ~5–6 months |
| Lose 20 kg (44 lb) | ~9–12 months |
Progress is rarely a straight line: expect faster weeks, slow weeks and plateaus.
Why the first week is faster
In the first 1–2 weeks, many people lose 1–3 kg. Much of that is water and stored carbohydrate (glycogen), not fat. It's normal, and it's normal for the pace to slow afterwards. See water weight.
Why faster isn't better
Very large deficits tend to cause:
- more muscle loss,
- strong hunger and fatigue,
- nutrient gaps,
- rebound weight gain when the diet ends.
How to pick your pace
- Slow (0.25 kg/week): easiest to sustain, good if you're close to your goal.
- Moderate (0.5 kg/week): a good default for most people.
- Faster (0.75–1 kg/week): possible with more weight to lose; keep protein high.
Track it
When you set up Nutora, you choose your goal weight and pace, and it estimates the date you'll reach your goal and the daily calories to get there. Related: calorie deficit, weight loss plateau.
Frequently asked questions
Is losing 1 kg a week safe?
For people with more weight to lose it can be, but 0.5–1% of body weight per week is a safer general guideline.
How much weight can I lose in a month?
Often 2–4 kg (4–9 lb), more in the first month due to water loss.
Why did my weight loss slow down?
Early water loss ends, your TDEE drops as you get lighter, and logging can get less precise.
Is fast weight loss more likely to come back?
Very rapid loss from extreme diets is often hard to maintain; steady loss builds habits.
Track it with a photo
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Nutora's AI estimates calories, protein, carbs and fat from a photo of your plate and tracks them against your daily goal. Download on iPhone and iPad with a 3-day free trial.
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