Weight Loss Percentage and Goal Date Calculator
Enter your starting and current weight to see the percentage you have lost. Add a goal and a start date to see your progress, your weekly rate and a projected goal date. All calculations run in your browser and nothing is stored.
Your data is not stored or sent to the server. All calculations are performed locally in your browser.
Enter your starting and current weight to see your progress.
5% and 10% milestones
The weight to reach for each milestone from a few starting weights.
| Starting weight | 5% lost | 10% lost |
|---|---|---|
| 70 kg (154 lb) | 66.5 kg | 63.0 kg |
| 80 kg (176 lb) | 76.0 kg | 72.0 kg |
| 90 kg (198 lb) | 85.5 kg | 81.0 kg |
| 100 kg (220 lb) | 95.0 kg | 90.0 kg |
| 110 kg (243 lb) | 104.5 kg | 99.0 kg |
| 120 kg (265 lb) | 114.0 kg | 108.0 kg |
How it's calculated
Weight lost (%) = (start − current) ÷ start × 100Progress to goal (%) = (start − current) ÷ (start − goal) × 100Weekly rate = (start − current) ÷ weeks since the start dateSources: CDC: Steps for losing weight; NIDDK: Treatment for overweight and obesity
Last reviewed
Frequently asked questions
How do I calculate weight loss percentage?
Subtract your current weight from your starting weight, divide by your starting weight and multiply by 100. For example, going from 90 kg to 85.5 kg is a loss of 4.5 kg, which is 5% of your starting weight.
Why does percentage matter more than kilograms or pounds?
The same number of kilograms means more for a lighter person than a heavier one. Percentage puts everyone on the same scale, which is why health research and doctors usually talk about losing a percentage of body weight.
Is 5% weight loss meaningful?
Yes. Even modest weight loss can improve blood pressure, cholesterol and blood sugar, and the CDC uses 5% as its example. The NIDDK suggests losing 5% of your body weight over about six months as a good first goal.
What is a safe rate of weight loss?
The CDC notes that people who lose about 1 to 2 lb (0.5 to 1 kg) a week are more likely to keep the weight off than people who lose it faster.
How accurate is the projected goal date?
It assumes your average rate so far continues. In practice loss usually slows as you get lighter, and day-to-day water changes add noise, so treat the date as a rough guide and look at the trend over several weeks.
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