How Much Weight Have I Lost?

Our free percentage weight loss calculator shows results in seconds and makes it simple to see your progress over time.

Just enter your starting weight and current weight, and the tool will show you exactly how much you’ve lost, helping you stay motivated and focused on your goals.

Weight loss percentage is a simple way to understand how much weight you’ve lost compared to where you started.

Rather than focusing on the number on the scales alone, it shows your progress in a way that’s easier to compare over time and between different people.

Weight loss percentage is worked out by looking at:

• The difference between your starting weight
• Your current weight
• Then expressing that as a percentage of your starting weight

For example, losing 5kg means something very different for someone who started at 70kg compared with someone who started at 110kg.

Luckily, you don’t need to worry about how to work out a percentage. Our calculator does this for you automatically. Enter your starting weight and your current weight, and the calculator shows your weight loss as a percentage.

This helps you see small but meaningful changes that might not feel obvious day to day and gives a clearer picture of progress than the scales alone.

Using percentages can also be motivating, as even modest reductions can reflect real health benefits and steady progress in the right direction.

For most people, losing around 5–10% of their starting weight over time is considered a realistic and meaningful goal.

A healthy weight loss percentage is one that reflects steady, sustainable progress rather than rapid changes.

This level of weight loss has been shown to bring health benefits, such as improved blood sugar control, lower blood pressure, and reduced strain on joints, even if you’re still above your ideal weight.

It’s important to remember that healthy weight loss isn’t the same for everyone.

Your age, starting weight, medical conditions, and how you’re losing weight – for example, lifestyle changes or weight loss medication, all play a role.

Faster or larger percentages aren’t always better, and very rapid weight loss can be hard to maintain.

If you are using weight loss injections, you can expect your weight loss to be in the region of around 20% of your starting weight.

Tracking your progress helps you understand what’s really happening with your weight over time, rather than relying on day-to-day changes on the scales.

Weight naturally goes up and down, so looking at trends gives a clearer picture of whether you’re moving in the right direction.

By tracking regularly, you can spot small but meaningful changes that might otherwise be easy to miss. Seeing progress written down, even gradual progress, can be motivating and help you stay consistent with healthy habits.

Tracking also helps you notice patterns. For example, you might see how changes to your eating, activity, sleep, or medication affect your results. If progress slows or stalls, having this information makes it easier to adjust your approach or seek advice.

Our calculator makes tracking simple by showing your results in clear numbers and percentages, helping you focus on steady, sustainable progress rather than short-term fluctuations.

Here are some useful UK-focused tools and resources to help you track your weight, food, activity and progress as part of your weight loss journey:

• NHS Better Health: A hub of free support including tools, tips and apps to help you lose weight, track activity and make healthy lifestyle changes.
• NHS Weight Loss Plan App: A free 12-week plan with a daily diary to log food, exercise and weekly weight trends (iPhone & Android).
• NHS BMI Calculator: Easy tool to check whether your weight is in a healthy range for your height.
• NHS Digital Weight Management Programme: An online course offering health tracking, learning modules and goal-setting tools. Ask your GP how to access it.