Why Do I Weigh Less in the Morning? How Much Weight You Lose Overnight
By WellnessVigor · Updated October 10, 2026 · 6 min read
You step on the scale in the morning and feel great, then weigh yourself again in the evening and the number is 1 to 2 kg higher. Did you really gain that much in a day?
No. Your weight naturally goes up and down throughout the day. Here is why you weigh less in the morning, how much weight you lose overnight, and the best way to weigh yourself.
Quick answer
You weigh less in the morning because you have not eaten or drunk for several hours and you lose water overnight through breathing and sweat. Many people see a drop of about 0.5 to 1 kg (1 to 2 lb). It is mostly water, not fat. For accurate tracking, weigh yourself first thing in the morning after using the bathroom, and watch your weekly average.
- No food or drink overnight. Everything you eat and drink adds weight during the day until it is digested and used or passed.
- Water lost through breathing. Each breath releases water vapour, and over 7 to 9 hours that adds up.
- Sweat. You sweat during sleep, more in a warm room or under heavy bedding.
- Bathroom first thing. Emptying your bladder and bowels removes more weight.
- Energy used overnight. Your body burns stored fuel while you sleep. See how many calories you burn while sleeping.
How much weight do you lose overnight?
It varies, but many people weigh about 0.5 to 1 kg (1 to 2 lb) less in the morning than the night before. Larger bodies, warm rooms, salty or large dinners and alcohol can make the difference bigger. This is not fat loss: most of it comes back as you eat and drink during the day.
Why your weight changes day to day
Even weighing at the same time each morning, your weight can go up or down by 1 to 2 kg from day to day because of:
- Salty meals, which make the body hold water
- More carbohydrates, which are stored with water
- A hard workout, which causes temporary water retention in muscles
- The menstrual cycle
- Poor sleep and stress
- Constipation
This is why one weigh-in can be misleading. Read why you might not be losing weight in a calorie deficit.
Want steady results you can see on the scale week after week? 35 Days to a Leaner You gives you a simple daily plan for real fat loss.
The best way to weigh yourself
- Weigh first thing in the morning, after the bathroom, before eating or drinking.
- Wear the same thing (or nothing) each time.
- Use the same scale on a hard, flat floor.
- Look at your weekly average, not single days.
- Also track your waist every two weeks.
A smart scale can sync your weight to an app and show trends automatically.
Keep reading
Frequently asked questions
Is morning weight your real weight?
Why do I weigh 2 kg more at night?
How much should my weight fluctuate daily?
Should I weigh myself every day?
Sources
This article is for general information only and is not medical advice. See our Medical Disclaimer.