How Fast Should You Lose Weight? Timelines by Percent of Body Weight
October 21, 2026
Advice that you should lose one to two pounds a week is easy to remember, but it ignores that a 120 kg person and a 60 kg person have very different margins. A better guide is a percentage of body weight: about 0.5% to 1% per week. This scales with your size and gives realistic expectations about how long a goal will take.
At 0.75% per week, a person weighing 90 kg loses about 0.67 kg in the first week, and the same percentage gives slightly smaller absolute losses as weight falls.
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A heavier person has more stored energy and a higher TDEE, so a deficit of 700 calories is a smaller share of their intake. A lean person has less to lose and risks losing muscle if they diet too hard. Using a percentage of body weight means both can pick a pace in the same sensible range.
Research on lean athletes suggests that losing around 0.7% of body weight per week preserved more lean mass than losing 1.4% per week, while producing similar fat loss over a fixed period. Slower rates also tend to improve training performance and make diets easier to stick to.
Timeline for a 10 kg Goal
The table models someone going from 90 kg to 80 kg, losing a constant percentage of current body weight each week. It assumes perfect adherence, so real timelines run longer because of plateaus, water retention, and social events.
| Weekly pace | Weekly loss at 90 kg | Weeks to reach 80 kg | Approximate months |
|---|---|---|---|
| 0.5% of body weight | 0.45 kg | 24 | 5.5 |
| 0.75% of body weight | 0.68 kg | 16 | 3.7 |
| 1.0% of body weight | 0.90 kg | 12 | 2.8 |
Matching a Pace to a Deficit
A weekly loss of 0.75% at 90 kg is about 0.68 kg, equivalent to roughly 5,200 calories per week (at 7,700 per kg), or 740 per day. That is a large deficit for most people, so it would only be sustainable with higher activity or a high starting TDEE. Many people instead settle near 0.5% a week, which requires roughly 500 calories per day for a 90 kg person.
Remember that the 7,700-calories-per-kilogram figure overestimates real losses over time as your metabolism adjusts. Use it as a starting point and rely on actual weight trends.
Expect Plateaus and Water Weight
Daily weight can swing by 1 to 2 kg due to sodium, carbohydrate, hormones, and digestion. Weekly averages are far more informative than single readings. A true plateau is several weeks without a drop in the weekly average, and often resolves after a small calorie adjustment or a short diet break.
Early weight loss tends to look faster because glycogen and water leave the body together with fat. Do not be discouraged when the pace slows after the first two or three weeks.
When to Slow Down
Slow the pace if you notice persistent fatigue, declining strength, poor sleep, irritability, or intense cravings. Leaner people, older adults, and those training hard should lean toward the 0.5% end. People with significant weight to lose can start nearer 1% and slow as they get lighter.
Building the Plan
Pick a pace, convert it to a daily deficit, set protein and training goals, and review every two weeks. Re-estimate your TDEE after every 5 kg of loss, since the same intake produces a smaller deficit at a lower weight.
Frequently Asked Questions
How much weight should I lose per week?
A common guideline is 0.5% to 1% of body weight per week.
How long to lose 10 kg?
At 0.5% per week from 90 kg, about 24 weeks. At 1% per week, about 12 weeks.
Is losing weight faster than 1% per week unsafe?
It is harder to sustain and increases muscle loss risk. Medical programs use faster rates for specific cases under supervision.
Why does my weight loss slow down?
You weigh less, so your TDEE is lower, and adaptation and water shifts also play a role.
Should I weigh daily?
Daily weighing is useful if you average the numbers weekly and ignore day-to-day noise.