Weight Loss Percentage Calculator
Percent of body weight lost.
Enter your values
Enter the starting weight in kg.
Enter the current weight in kg.
Enter the goal 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.
- Percentage lost
- 8.95%
- Weight lost
- 8.5 kg
- Remaining to goal
- 8.5 kg
- Progress to goal
- 50%
- Clinically meaningful (5%)?
- Yes
Quick answer
Weight loss percentage is pounds or kilos lost divided by starting weight — a 5% loss already improves health markers.
% lost = (Start − Current) ÷ Start × 100
At a glance
| What it does | Percent of body weight lost. |
|---|---|
| Category | Health |
| Inputs needed | Starting weight, Current weight, Goal weight |
| Main output | Percentage lost |
| Formula | % lost = (Start − Current) ÷ Start × 100 |
| Cost | Free — no sign-up, no download |
How to use the Weight Loss Percentage Calculator
- 1Enter your starting weight.
- 2Enter your current weight.
- 3Add your goal to track progress.
Inputs explained
- Starting weight(kg)
- Enter the starting weight in kg.
- Current weight(kg)
- Enter the current weight in kg.
- Goal weight(kg)
- Enter the goal weight in kg.
Worked example
Using the values the calculator loads with:
Inputs
- Starting weight95 kg
- Current weight86.5 kg
- Goal weight78 kg
Results
- Percentage lost8.95%
- Weight lost8.5 kg
- Remaining to goal8.5 kg
- Progress to goal50%
- Clinically meaningful (5%)?Yes
Frequently asked questions
Why does 5% matter?
A 5% loss meaningfully improves blood pressure, glucose and lipids.
How fast is safe?
0.5–1% of body weight per week is the usual recommendation.
What do I need to enter into the Weight Loss Percentage Calculator?
Just 3 values: starting weight, current weight, goal 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 Weight Loss Percentage Calculator work out the answer?
Weight loss percentage is pounds or kilos lost divided by starting weight — a 5% loss already improves health markers. It applies the formula % lost = (Start − Current) ÷ Start × 100 and shows the working so you can check each step by hand.
Is the Weight Loss Percentage 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.