Percentage Weight Lost Calculator
Percent change between starting and current weight.
Enter your values
Enter the starting weight in kg.
Enter the current weight in kg.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Weight lost
- 7 kg
- Percent lost
- 7.4%
- Percent of starting remaining
- 92.6%
Quick answer
Percent weight lost is the weight change divided by starting weight, times 100.
% lost = (start - current) / start x 100
At a glance
| What it does | Percent change between starting and current weight. |
|---|---|
| Category | Health |
| Inputs needed | Starting weight, Current weight |
| Main output | Weight lost |
| Formula | % lost = (start - current) / start x 100 |
| Cost | Free — no sign-up, no download |
How to use the Percentage Weight Lost Calculator
- 1Enter your starting and current weight in the same units.
- 2The percentage is based on the starting weight, matching how most clinical trials report weight loss.
- 35-10% loss is often the threshold used to define clinically meaningful weight loss.
Inputs explained
- Starting weight(kg)
- Enter the starting weight in kg.
- Current weight(kg)
- Enter the current weight in kg.
Worked example
Using the values the calculator loads with:
Inputs
- Starting weight95 kg
- Current weight88 kg
Results
- Weight lost7 kg
- Percent lost7.4%
- Percent of starting remaining92.6%
Frequently asked questions
Why not just use kg lost?
Percentage lets you compare progress fairly regardless of starting body size.
What counts as significant?
Many studies use 5% as the threshold for meaningful health benefit.
What do I need to enter into the Percentage Weight Lost Calculator?
Just 2 values: starting weight, current weight. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Percentage Weight Lost Calculator work out the answer?
Percent weight lost is the weight change divided by starting weight, times 100. It applies the formula % lost = (start - current) / start x 100 and shows the working so you can check each step by hand.
Is the Percentage Weight Lost Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.