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What happens when you lose 5% or 10% of your body weight?

Reviewed 3 November 2026 · How these numbers are calculated

Losing 5% of your body weight is where health benefits start for most people with extra weight: guidelines say a sustained 3–5% loss brings clinically meaningful drops in blood sugar, HbA1c, triglycerides and the risk of type 2 diabetes. At 10% the gains grow: lower blood pressure, better cholesterol, and often less need for medication. For a 90 kg (198 lb) person that's 4.5 and 9 kg; at 0.5% a week it takes about 10 and 21 weeks.

How much is 5% and 10% of your weight?

Weight to lose for 5% and 10%
Weight5%10%
60 kg 132 lb3.0 kg6.6 lb6.0 kg13.2 lb
70 kg 154 lb3.5 kg7.7 lb7.0 kg15.4 lb
80 kg 176 lb4.0 kg8.8 lb8.0 kg17.6 lb
90 kg 198 lb4.5 kg9.9 lb9.0 kg19.8 lb
100 kg 220 lb5.0 kg11.0 lb10.0 kg22.0 lb
110 kg 243 lb5.5 kg12.1 lb11.0 kg24.3 lb
120 kg 265 lb6.0 kg13.2 lb12.0 kg26.5 lb
130 kg 287 lb6.5 kg14.3 lb13.0 kg28.7 lb

What losing 5% does

The first few percent take fat from the places that matter most for metabolism, including the liver and around the organs. The 2013 US obesity guideline sets 3–5%, kept off, as the point of clinically meaningful benefit for blood sugar, HbA1c and triglycerides. In the Diabetes Prevention Program, people with raised blood sugar who aimed for 7% (and kept off about 5%) cut their risk of developing type 2 diabetes by 58% over about three years, more than the drug metformin did.

What losing 10% does

Beyond 5%, blood pressure, LDL and HDL cholesterol keep improving and many people need fewer medicines for them. Joints carry less load, and sleep apnoea and fatty liver often improve. Exactly how much differs from person to person, but more loss generally means more benefit.

Is losing 10% of your body weight a lot?

It's a big, realistic goal: more than most diets achieve in the long run, but well within reach at a steady pace. Many people notice it in their clothes and waist well before they see it in the mirror. Track your waist or body fat alongside the scale (body fat calculator).

How long does it take?

Weeks to lose 5%, 10% and 15% at different paces
Pace5%10%15%
0.25%/week214365
0.5%/week112233
0.75%/week71422
1%/week61117
Each week's loss is a share of that week's weight, so the kilos per week shrink a little as you go.

The calorie deficit calculator turns a pace into calories and a date. For the pace itself, see how much weight to lose a week.

Keeping it off

A lighter body burns less, so the calories that got you there are a small deficit, not maintenance. Recalculate your maintenance calories at the new weight, and step back up gradually (reverse dieting). Keep the habits that worked: protein, strength training and steps.

And with weight-loss medicines?

In the big trials, semaglutide 2.4 mg averaged a 14.9% loss over 68 weeks and tirzepatide 15 mg 20.9% over 72 weeks, both with lifestyle advice. Those are averages and the medicines are a decision for you and your doctor. Track your progress with the weight loss percentage calculator either way.

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