Weight Loss Percentage Calculator
Find what percentage of your body weight you have lost, how far you are toward your goal, and your average loss per week, in pounds or kilograms.
Results
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Quick Answer
Weight loss percentage = (starting weight − current weight) ÷ starting weight × 100. If you started at 200 lb and now weigh 184 lb, you have lost 16 lb, which is 8% of your starting weight. The CDC notes that even a 5% loss, 10 lb for a 200 lb person, can improve blood pressure, cholesterol and blood sugar.
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Table of Contents
- Weight Loss Percentage Calculator
- Quick Answer
- Related Calculators
- How This Weight Loss Percentage Calculator Works
- How to Use the Weight Loss Percentage Calculator
- Weight Loss Formulas
- Key Terms
- Worked Example
- Real-Life Examples
- Weight Loss Percentage vs BMI
- Weight Loss Percentages
- Why Percentage Beats Pounds
- Common Mistakes to Avoid
- Frequently Asked Questions
- References & Sources
How This Weight Loss Percentage Calculator Works
Enter your starting weight and current weight in pounds or kilograms. The calculator shows how much you have lost as a weight and as a percentage of where you started. Add a goal weight to see your progress toward it, and the number of weeks since you began to see your average loss per week and roughly how long the rest may take at that pace.
Quick explanation: percentage lost compares the loss with your starting weight.
- Fair comparison: losing 10 lb is 5% for a 200 lb person but 10% for a 100 lb person.
- Units do not matter: the percentage is the same in pounds or kilograms.
- Pace: the CDC says about 1 to 2 lb a week is a gradual, steady pace.
How to Use the Weight Loss Percentage Calculator
- Choose pounds or kilograms.
- Enter your starting weight and current weight.
- Optionally, enter a goal weight.
- Optionally, enter the number of weeks since you started.
- Press Calculate to see the percentage, progress and weekly pace.
Weight Loss Formulas
- Weight lost: starting weight − current weight
- Weight loss %: weight lost ÷ starting weight × 100
- Progress to goal: weight lost ÷ (starting weight − goal weight) × 100
- Average per week: weight lost ÷ weeks
- Weeks to goal: (current weight − goal weight) ÷ average loss per week
Key Terms
- Starting weight: your weight when you began, used as the base for the percentage.
- Weight loss percentage: weight lost as a share of your starting weight.
- Goal weight: the weight you are aiming for.
- Plateau: a period when weight stays the same despite effort.
- Water weight: short-term changes in body water that move the scale up or down.
Worked Example
Maria started at 90 kg and weighs 81 kg after 12 weeks. Her goal is 75 kg.
- Weight lost = 90 − 81 = 9 kg
- Weight loss % = 9 ÷ 90 × 100 = 10%
- Progress to goal = 9 ÷ (90 − 75) × 100 = 60%
- Average = 9 ÷ 12 = 0.75 kg a week (about 1.65 lb), so the last 6 kg may take about 8 more weeks.
Real-Life Examples
- Health milestone: 200 lb to 190 lb is a 5% loss, the level the CDC gives as an example of a helpful change.
- Weight loss challenge: a 250 lb person losing 20 lb (8.0%) beats a 160 lb person losing 12 lb (7.5%).
- Metric goal: 85 kg to 78 kg is a 8.24% loss.
- Pace check: 15 lb in 10 weeks is 1.5 lb a week, inside the 1 to 2 lb range.
Weight Loss Percentage vs BMI
- Weight loss percentage tracks change from your own starting point.
- BMI compares your weight with your height to give a screening category.
- Use both: the percentage shows progress, and BMI shows where you are now.
Weight Loss Percentages
| Starting weight | 5% loss | 10% loss | 15% loss |
|---|---|---|---|
| 150 lb | 7.5 lb | 15 lb | 22.5 lb |
| 175 lb | 8.75 lb | 17.5 lb | 26.25 lb |
| 200 lb | 10 lb | 20 lb | 30 lb |
| 225 lb | 11.25 lb | 22.5 lb | 33.75 lb |
| 250 lb | 12.5 lb | 25 lb | 37.5 lb |
| 300 lb | 15 lb | 30 lb | 45 lb |
Why Percentage Beats Pounds
Comparing pounds lost can be unfair between people of different sizes, which is why weight loss challenges and clinical studies often use percentage of starting weight. It also helps you judge your own progress over time: as you get lighter, the same number of pounds is a bigger share of your weight, so the percentage keeps your goals in proportion.
Weight is not the whole story. Water, food in the gut and muscle gain can hide fat loss on the scale. Waist size, how your clothes fit, strength and energy are useful extra signs of progress.
Common Mistakes to Avoid
- Dividing by the current weight. The percentage uses the starting weight.
- Comparing weights from different scales. Use the same scale each time.
- Reading daily swings as progress. Water can change weight by a few pounds a day; look at the trend.
- Mixing pounds and kilograms. Use the same unit for every weight.
- Chasing a very fast pace. The CDC notes steady loss of about 1 to 2 lb a week is easier to keep off.
Frequently Asked Questions
Subtract your current weight from your starting weight, divide by your starting weight and multiply by 100.
The CDC says even 5% can improve blood pressure, cholesterol and blood sugar for people above a healthy weight.
The CDC says a gradual pace of about 1 to 2 pounds a week is more likely to last.
No. The percentage is the same in pounds and kilograms.
Divide the weight you have lost by the total you want to lose, then multiply by 100.
Water, salt and food in the gut can raise weight from day to day. Watch the trend over weeks.
Yes. It makes the contest fair for people of different sizes.
Multiply your weight by 0.10. For 180 lb that is 18 lb.
Yes. If your current weight is higher, it shows the gain as a percentage.
References & Sources
| Source | Used For | Link |
|---|---|---|
| CDC, Steps for Losing Weight | Gradual loss of 1 to 2 pounds a week; a 5% loss example and its health benefits. | https://www.cdc.gov/healthy-weight-growth/losing-weight/index.html |