Weight Loss Percentage Calculator
Calculate your weight loss percentage by dividing your pounds or kilograms lost by your starting weight and multiplying by 100. This weight loss percentage calculator displays the arithmetic alongside your 5% and 7% marks.
How the Percentage Is Calculated
A weight loss percentage is calculated with the mathematical formula (starting weight − current weight) ÷ starting weight × 100. Both measurements must use the same unit of mass. The percentage result is identical whether you enter pounds or kilograms. This weight loss percentage calculator runs the arithmetic in your browser and displays each step of the calculation.
Consider a person with a starting weight of 200 pounds and a current weight of 188 pounds. The calculation subtracts 188 from 200 to find 12 pounds lost. Dividing 12 by 200 yields 0.06. Multiplying 0.06 by 100 gives a weight loss percentage of 6.0%. The calculator also works out the weights for the 5% and 7% marks. The 5% mark sits at 200 × 0.95 = 190 pounds, which represents 10 pounds lost. The 7% mark sits at 200 × 0.93 = 186 pounds, which represents 14 pounds lost. At 188 pounds, the current weight has passed the 5% mark and sits 2 pounds above the 7% mark.
The calculator displays the total percent lost, the written working, the weight at both reference marks, and how far your current weight sits from each mark. If your current weight is higher than your starting weight, it shows the percent gained instead.
The 5% and 7% Marks
The 5% and 7% marks on this calculator come directly from findings published by the Centers for Disease Control and Prevention (CDC). According to the CDC National Diabetes Prevention Program lifestyle change program, people with prediabetes in a structured lifestyle change program lost 5% to 7% of their body weight through healthier eating and 150 minutes of physical activity per week. The CDC reports that research showed this cut their risk of developing type 2 diabetes by 58%. For participants over 60 years old, the program cut that risk by 71%.
The calculator works out these marks by multiplying your starting weight by 0.95 and 0.93. For a 200-pound starting weight, the 5% mark is 190 pounds and the 7% mark is 186 pounds. The calculator shows how far your current weight is from each mark. It does not set an individualized weight target or clinical goal. The 5% and 7% statistics come specifically from research cohorts composed of people with prediabetes.
Where the Result Fits
The 5% and 7% marks originate from clinical research on prediabetes prevention, but they do not define whether you have prediabetes. The prediabetes risk test and the A1C calculator show whether the prediabetes range may apply to you. The prediabetes risk test provides a score out of 10 based on CDC risk criteria. The A1C calculator maps your hemoglobin A1C values into the CDC normal, prediabetes, and diabetes categories.
The prediabetes warning signs guide covers prediabetes warning signs and who should be tested. The waist-to-height ratio calculator compares waist against half your height (NICE bands).
This calculation runs directly inside your web browser. No entered numbers are saved or stored unless you choose to use the optional field to email your results. The weight loss percentage calculator is free, provides no diagnosis and does not set a target body weight.
What You'll Get
- Percent of starting weight lost (or gained), with the working shown
- Your weight at the 5% and 7% marks and how far you are from each
What to Look For in a Body-Composition Scale
A bioimpedance scale trends body fat and muscle rather than just weight — useful when the number stalls but your composition is improving. The absolute body-fat % isn't lab-accurate, so use it for TRENDS at a consistent time of day. Choose one that syncs to an app so you can watch the trend line.
Frequently Asked Questions
How do I calculate weight loss percentage?
Subtract your current weight from your starting weight, divide that difference by your starting weight, and multiply the result by 100. For example, a starting weight of 200 pounds and a current weight of 188 pounds gives 12 pounds lost. Dividing 12 by 200 and multiplying by 100 equals a 6.0% weight loss.
How do I calculate weight loss percentage in kg?
Use the same formula: subtract your current kilograms from your starting kilograms, divide by your starting kilograms, and multiply by 100. The calculated percentage is identical in kilograms or pounds because both inputs use the same measurement unit.
What is 5% of my body weight?
Multiply your starting weight by 0.05 to find 5% of your weight. Subtracting that number from your starting weight gives your 5% mark. For a starting weight of 200 pounds, 5% is 10 pounds, placing the 5% mark at 190 pounds.
Why does the CDC use 5% to 7%?
The CDC National Diabetes Prevention Program cites research on people with prediabetes who lost 5% to 7% of their body weight through healthier eating and 150 minutes of physical activity per week. That weight loss cut their risk of developing type 2 diabetes by 58%, and by 71% for people over 60 years old.
Does this calculator set a goal weight for me?
No, the calculator does not set a personal weight goal. It displays the 5% and 7% marks because the CDC lifestyle change program evaluated those numbers in people with prediabetes.
Topic updates
Get the weekly metabolic health roundup
Insulin resistance, blood sugar, visceral fat, GLP-1 plateaus, metabolic syndrome, and weight-loss physiology.
Affiliate disclosure: Some links above are affiliate or referral links and we may earn a commission at no extra cost to you. As an Amazon Associate we earn from qualifying purchases. This is general information and is not medical advice. Talk to your clinician before acting.