---
title: How Fast Can You Lose Fat? Safe Weekly Rates and Timelines
url: https://progresslens.app/guides/how-fast-can-you-lose-fat/
language: en
updated: 2026-11-13
---

# How fast can you lose fat?

By the [ProgressLens team](https://progresslens.app/about/) · Updated November 13, 2026

Faster isn’t better if half of what you lose is muscle. Here’s the pace most evidence and coaches land on.

Short answer

A sustainable rate is about 0.5–1% of bodyweight a week: 0.4–0.8 kg (1–1.8 lb) for someone at 80 kg. Higher body fat allows the faster end; lean people should go slower to protect muscle. Expect it to slow as you get leaner. See your own timeline with the [how long to get abs calculator](https://progresslens.app/tools/how-long-to-get-abs-calculator/).

**On this page**
- [Weekly loss by bodyweight](#table)
- [Why the pace matters](#why)
- [Track fat, not water](#track)
- [FAQ](#faq)

## Weekly loss by bodyweight

| Bodyweight | 0.5% a week | 1% a week |
| 60 kg (132 lb) | 0.30 kg | 0.60 kg |
| 70 kg (154 lb) | 0.35 kg | 0.70 kg |
| 80 kg (176 lb) | 0.40 kg | 0.80 kg |
| 90 kg (198 lb) | 0.45 kg | 0.90 kg |
| 100 kg (220 lb) | 0.50 kg | 1.00 kg |
| 120 kg (265 lb) | 0.60 kg | 1.20 kg |

### See the fat come off.

ProgressLens lines up every photo with your last one, then AI Analyze tells you your body-fat range, what changed, fat vs muscle, and whether to cut or bulk. iPhone and Android, private, no account.

## Why the pace matters

Losing weight faster than about 1% a week for long periods raises the share of lean mass lost, especially if you’re already lean or not lifting. In bodybuilding research, slower cuts preserved more strength and muscle.

## Track fat, not water

Day-to-day weight swings by a kilo or more from water and salt. Use a weekly average, a waist measurement every week or two, and matched photos every two to four weeks.

FAQ

## Frequently asked questions

**Can I lose 1 kg of fat a week?**

If you weigh about 100 kg or more, yes. Lighter people should aim lower to protect muscle.

**Why did I lose 3 kg in the first week?**

Mostly water and glycogen. Fat loss is slower and steadier.

## Sources

- Helms ER, Aragon AA, Fitschen PJ (2014). Evidence-based recommendations for natural bodybuilding contest preparation. J Int Soc Sports Nutr 11:20.
- Garthe I et al. (2011). Effect of two different weight-loss rates on body composition and strength in elite athletes. Int J Sport Nutr Exerc Metab 21:97–104.

## Keep reading

[Why your weight fluctuatesWater, salt, glycogen and more.Read more →](https://progresslens.app/guides/why-does-my-weight-fluctuate/)[Am I losing fat or muscle?Four checks you can do at home.Read more →](https://progresslens.app/guides/am-i-losing-fat-or-muscle/)[How long to see resultsRealistic timelines.Read more →](https://progresslens.app/guides/how-long-to-see-results/)

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ProgressLens is an AI progress photo app for iPhone, iPad and Android that turns your check-in photos and tape measurements into a Progress Report: your body-fat range, what changed, whether you are losing fat or muscle, and whether to cut, lean bulk, recomp or maintain.
App Store: https://apps.apple.com/app/progresslens/id6806300575
Google Play: https://play.google.com/store/apps/details?id=app.progresslens