Free calculator

Weight Loss Percentage Calculator

Tracking weight loss as a percentage gives you a clearer picture of progress than kilograms alone. Losing 5 kg means very different things for someone who weighs 70 kg versus 120 kg. This calculator shows your weight loss percentage, helping you set meaningful milestones.

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Enter your details

Starting weight

Current weight

Your Weight Loss Progress

Example

Example figures, not your own. Worked for a start weight of 95 kg and a current weight of 87 kg. Enter your own details and press Calculate.

Weight Loss

8.4%

Weight Lost

8.0kg

Current Weight

87.0kg

Started at 95.0 kg

Milestone Progress

✓

5% - Clinically significant90.3 kg

10% - Major health benefits85.5 kg

15% - Transformative80.8 kg

20% - Outstanding76.0 kg

Assessment

Great progress! You have reached the 5% milestone, which reduces health risks.

How It Works

Weight loss percentage is calculated as: ((starting weight - current weight) / starting weight) x 100. For example, going from 90 kg to 81 kg is a 10% weight loss. Research shows that a 5-10% weight loss produces significant health benefits for overweight individuals.

How to use it

1Enter your starting weight in kilograms
2Enter your current weight in kilograms
3Click "Calculate" to see your weight loss percentage
4Track your progress against common milestones (5%, 10%, 15%)

Quick Reference

Start Weight (kg)	5% Loss (kg)	10% Loss (kg)	15% Loss (kg)	20% Loss (kg)
70	66.5	63	59.5	56
80	76	72	68	64
90	85.5	81	76.5	72
100	95	90	85	80
110	104.5	99	93.5	88
120	114	108	102	96
130	123.5	117	110.5	104
140	133	126	119	112

A 5-10% weight loss is considered clinically significant and produces meaningful health improvements (reduced blood pressure, improved insulin sensitivity, lower cholesterol).

How This Is Calculated

Weight Loss % = ((Starting Weight - Current Weight) / Starting Weight) x 100

Starting Weight: = your weight at the beginning of your program (kg)
Current Weight: = your weight now (kg)

A positive percentage means weight lost. A negative percentage indicates weight gain. The Australian National Health and Medical Research Council recommends aiming for 5-10% of initial body weight as a first goal.

Frequently Asked Questions

What percentage of weight loss is significant?

Research consistently shows that a 5-10% reduction in body weight produces meaningful health improvements, including lower blood pressure, improved blood sugar control, reduced cholesterol, and decreased joint pain. This is considered the minimum clinically significant weight loss.

How quickly should I lose weight?

A safe and sustainable rate is 0.5-1% of body weight per week, which works out to roughly 0.5-1 kg per week for most people. Faster weight loss is more likely to include muscle loss and is harder to maintain long-term.

Why use percentage instead of kilograms?

Percentage normalises weight loss across different body sizes. Losing 5 kg when you weigh 100 kg (5%) is a very different achievement than losing 5 kg when you weigh 60 kg (8.3%). Percentage also aligns with clinical weight loss recommendations.

What percentage of weight loss is too much?

Losing more than 1-1.5% of body weight per week over an extended period may indicate excessive calorie restriction. In clinical programs, 15-20% total weight loss is considered substantial. Beyond this, medical supervision is recommended.

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