Healthy Weight Targets and Body Ratios Beyond BMI
BMI is only a starting point — set a realistic target weight, use body ratios like waist-to-height and the ponderal index, and track progress the right way for a sharper picture of health.
Weight Loss Percentage Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Weight lost
10.00%
- Weight change
- 9.0
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Weight Loss Percentage Calculator
The Weight Loss Percentage Calculator works out your weight lost, along with 1 related figure in an instant. Enter starting weight and current weight and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the starting weight.
- Enter the current weight.
- Read off your weight lost, together with weight change — the calculator updates automatically, with no button to press.
Formula
The Weight Loss Percentage Calculator uses the formula:
Weight lost = (Starting weight - Current weight) ÷ Starting weight × 100
Worked example
For example, with starting weight of 90 kg and current weight of 81 kg, the weight lost is 10.00%.
| Starting weight | 90 kg |
|---|---|
| Current weight | 81 kg |
| Weight lost | 10.00% |
|---|---|
| Weight change | 9.0 |
Results are estimates for educational use, not professional advice.
Key terms explained
- Percentage
- A number expressed as a fraction of 100, written with the % sign.
Frequently asked questions
Subtract your current weight from your starting weight, divide by the starting weight and multiply by 100. Going from 90 kg to 81 kg is a 10% loss.
Percentage puts the loss in context of your body size, making it easier to compare progress between people of different starting weights.
Around 0.5–1% of body weight per week is widely considered safe and sustainable for most people.
Yes. If your current weight is higher than the start, the result is negative, showing the percentage gained instead.
Enter the starting weight. Enter the current weight. Read off your weight lost, together with weight change — the calculator updates automatically, with no button to press.
Related guides
Weight Loss Percentage Table: Weight lost by Starting weight
Reference table of weight lost for Weight Loss Percentage across a range of starting weight values — exact, engine-computed figures you can read off at a glance.
How to Calculate Weight Loss Percentage: Formula, Steps & Examples
Learn how to calculate Weight Loss Percentage — the formula explained step by step, with worked examples and a free calculator to check your answer.