% Weight Loss Percentage

Weight Loss Percentage Calculator (New Zealand)

Our free weight loss percentage calculator instantly shows how much of your starting body weight you've lost — the same metric used by doctors and clinical researchers. Use our full suite of free dietitian-reviewed calculators to track every aspect of your weight loss journey.

To calculate your weight loss percentage, subtract your current weight from your starting weight, divide by your starting weight, and multiply by 100. Our calculator does this instantly — just enter your numbers above.

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How to Calculate Weight Loss Percentage

The percent weight loss formula is straightforward:

Weight Loss % = ((Starting Weight − Current Weight) ÷ Starting Weight) × 100

Example: You started at 200 lbs and now weigh 185 lbs:

((200 − 185) ÷ 200) × 100 = 7.5% weight loss

Frequently Asked Questions

How do I calculate weight loss percentage?

Subtract your current weight from your starting weight, divide by your starting weight, multiply by 100. Formula: ((Start − Current) ÷ Start) × 100. Use our weight loss calculator for an instant result plus your calorie target and timeline.

What is a good weight loss percentage per week?

The CDC recommends 0.5 to 2 lbs per week — approximately 0.25–1% of body weight weekly. Losing more than 1% per week risks muscle loss and nutrient deficiencies.

What is the 5% weight loss milestone?

Losing 5% of starting body weight is a clinically recognized health milestone. Studies show 5% loss produces measurable improvements in blood pressure, blood sugar, and cholesterol — even before reaching a goal weight.

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