Percentages make progress comparable between people of different sizes, which is why weight-loss challenges and clinical trials use them.
How to use the Weight Loss Percentage Calculator
- Starting weight
- Current weight
- Want to work backwards? Type a value into Weight lost and Current weight is calculated for you.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Subtract current weight from starting weight and divide by starting weight.
Inputs explained
| Field | What to enter |
|---|---|
| Starting weight | Units: kg, lb, g, oz, st |
| Current weight | Units: kg, lb, g, oz, st |
What each result means
- Weight lost = ([Starting weight] – [Current weight]) ÷ [Starting weight] × 100
- Amount lost = [Starting weight] – [Current weight]
Example values
How the main result changes when Current weight changes and everything else stays at the example values above:
| Current weight (kg) | Weight lost (%) |
|---|---|
| 44 | 53.68 |
| 66 | 30.53 |
| 88 | 7.37 |
| 110 | -15.79 |
| 132 | -38.95 |
| 176 | -85.26 |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
Weight loss % = (start − current) ÷ start × 100Worked example
Inputs — Starting weight: 95 kg; Current weight: 88 kg.
Results — Weight lost = 7.37 %; Amount lost = 7 kg.
Frequently asked questions
What is a meaningful amount?
Around 5% can improve blood pressure, blood sugar and cholesterol.
Why do I see a negative number?
You have gained weight since the start.
What formula does the Weight Loss Percentage Calculator use?
Weight loss % = (start − current) ÷ start × 100.
Can I work backwards from the result?
Yes. Type the result you want into Weight lost and the calculator finds the matching current weight.