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Weight Loss Percentage Calculator

Enter your starting weight and current weight to calculate your total percentage loss.

Track your weight loss as a percentage of your starting body weight.

Quick Answer

To find your weight loss percentage, subtract your current weight from your starting weight, divide by the starting weight, then multiply by 100. Formula: **((Start - Current) / Start) × 100**. Losing 20lbs from 200lbs is a 10% loss.

Weight Loss Percentage Calculator

lbs/kg
lbs/kg

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How It Works

  1. Weigh yourself and note your **Current Weight**.
  2. Recall your **Starting Weight**.
  3. Subtract Current from Start to find the pounds/kg lost.
  4. Divide the lost amount by the Starting Weight.
  5. Multiply by 100.

Formula:

Loss % = ((Start - Current) / Start) × 100

Why Percentage Matters

Losing 10 lbs is very different for someone who weighs 150 lbs vs 300 lbs. - **10 lbs loss at 150 lbs**: 6.7% loss (Significant) - **10 lbs loss at 300 lbs**: 3.3% loss (Moderate) Tracking percentage normalizes your progress relative to your size, giving a fairer picture of your effort.

Examples

Example A: The 10% Goal

Result: Start: 200 lbs. Current: 180 lbs. Loss: 20. 20/200 = 0.10 (10%).

Example B: Small Win

Result: Start: 150 kg. Current: 147 kg. Loss: 3. 3/150 = 0.02 (2%).

Example C: Weight Gain

Result: Start: 120 lbs. Current: 125 lbs. Loss: -5. -5/120 = -4.1% (Gain).

Frequently Asked Questions

What is a healthy weight loss percentage?

Experts recommend losing 5-10% of body weight to see significant health improvements like lower blood pressure and cholesterol.

How fast should I lose weight?

A safe rate is generally 1-2 lbs per week, or about 1% of your body weight per week.

Does the unit (lbs vs kg) matter?

No. As long as you use the same unit for both Start and Current, the percentage calculation works exactly the same.

How do I calculate % body fat?

This calculator is for scale weight only. To measure body composition, use our [Body Fat Percentage Calculator](/calculators/body-fat-percentage-calculator).

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