How Much Weight Can You Safely Lose Per Week?
Published 1/13/2026 · 3 min read · Health calculators
A widely recommended safe rate is about 1 to 2 lb (0.5 to 1 kg) of weight loss per week. Because roughly 3,500 kcal is stored in a pound of body fat (about 7,700 kcal per kilogram), losing 1-2 lb a week takes a daily energy deficit of about 500-1,000 kcal, from eating less, moving more, or both. Slower, steady loss is easier to sustain and better protects muscle than crash diets. People who lose weight gradually are more likely to keep it off.
Health bodies suggest losing about 1-2 lb (0.5-1 kg) per week. Learn the ~500-1000 kcal/day deficit behind that and why slow-and-steady lasts.
The energy-deficit maths
Weight loss comes from an energy deficit — burning more calories than you eat over time. As a rough rule, a pound of body fat holds about 3,500 kcal and a kilogram about 7,700 kcal. So a deficit of 500 kcal a day adds up to roughly 1 lb (0.45 kg) a week, and 1,000 kcal a day to about 2 lb (0.9 kg).
This 3,500-kcal rule is a simplification: real bodies adapt, water shifts and metabolism slows a little as you get lighter, so the scale rarely moves in a perfectly straight line. Use the deficit as a target to plan around, not a promise for every single week. Our calculator turns your goal into a daily calorie target.
Why slower is usually better
Very aggressive deficits cause more muscle loss, hunger and fatigue, and are hard to keep up. Losing 1-2 lb (0.5-1 kg) a week preserves more lean tissue, keeps energy steadier and fits into normal life. Major health bodies, including the CDC and NHS, back this gradual range for most adults.
The strongest reason to go slow is keeping it off. Rapid loss is often followed by regain, whereas people who lose weight gradually — building sustainable eating and activity habits — are more likely to hold their new weight over the long term. Aim for changes you could picture keeping for years.
Building a safe plan
Start from your TDEE — the calories you burn in a typical day — then subtract a deficit that fits your goal rate. Split it between eating a little less and moving a little more, so no single change feels drastic. Keep enough protein and don't drop below the minimums a professional would set for you.
Weigh yourself no more than once or twice a week, at the same time and conditions, and judge progress over several weeks rather than day to day. If you have a medical condition, take medication, are pregnant or breastfeeding, or plan to lose a large amount, get individual advice before you start.
Worked with our own calculator
Weekly weight-loss from calorie deficit
Given
- Daily calorie deficit (kcal)
- 500 kcal
Result
- Weekly loss (kg)
- 0.455 kg
- Monthly loss (kg)
- 1.948 kg
These figures are produced by the calculator below, not typed in by hand — they are recomputed whenever the tool changes.
Run it on your own figures →Frequently asked questions
- Is losing more than 2 lb (1 kg) a week ever safe?
- Faster loss is sometimes done under medical supervision, for example in people with obesity. On your own, staying within 1-2 lb (0.5-1 kg) a week is the safer general guideline.
- Why did I lose several pounds in the first week?
- Early drops are largely water, not fat, as the body uses stored carbohydrate that holds water. The rate usually settles to your steadier target after the first week or two.
- Do I have to count every calorie?
- No. The calorie target is a guide. Many people succeed by improving food quality and portion sizes and moving more, using rough tracking rather than exact counts.
- What if my weight loss stalls?
- Plateaus are normal: as you get lighter you burn fewer calories, so the old deficit shrinks. Recalculate your targets at your new weight and be patient — or ask a professional if it persists.
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For general information only — not medical advice. Consult a qualified health professional before changing your diet or exercise.
Sources
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