This weight loss percentage calculator can calculate how much weight you’ve lost by comparing the current weight to the initial one. You can read more about these determinations below the form.

Initial Weight: *
Current Weight: *
Initial Weight: *
Current Weight: *

How does this weight loss percentage calculator work?

This is a quick weight tool that can help you determine how much of your weight you managed to loose in terms of percentage. You can use it in any of the two measurement systems available, English and metric and you can make as many calculations as you want. All you need to do is input the initial and current weight and you will be given the weight loss percentage.

There is also a different case that might appear whenthe initial weight is smaller than the current weight it will return the percentage of weight gain. If the initial weight is equal to current weight it will return that the weight was kept over time at the same level.

Although this calculator is designed as a help to see what you’ve lost, you can also use it to make scenarios on weight loss for your plan and see which the percentages that suit your needs are.

Example calculations

  • Using the English tab:
Initial weight 210lbs Please note there is a 11.90% weight loss!
Current weight 185lbs
  • Using the metric tab:
Initial weight 125kg Please note there is a 24.80% weight loss!
Current weight 94kg

Why is it the percentage of weight loss important?

This is a determination of how much of your initial weight you lost, while comparing it to the actual one. You can use this percentage to assess whether you are loosing weight in a healthy manner.

There are certain limits discussed about this and some advocate that an initial 10 percent loss in sufficient to begin with while everything going above, especially in a short period of time, might suggest a drastic weight loss that could accompany or determine health deficits.

What stands for a healthy weight loss?

Perhaps one of the most important things you need to keep in mind when you embark on a diet or make plans about loosing weight is to set some realistic goals.

Realistic in terms of both your capacity to sustain a diet and exercise but also in terms of maintaining your health and not causing any imbalances.

If you feel you’ve put some pounds on maybe you should take a look at your lowest adult weight and try and set that as a goal instead of going way beyond it, because that would be an unrealistic goal. Also, you should aim not to exaggerate by loosing more than 10 percent of your initial weight. Once this goal is achieved you should wait for at least half a year before you start off dieting again if you still want to continue loosing weight.

Don’t forget that you also need to monitor your caloric intake but in the same time analyze the time frame you’ve set. Healthy loss means 1 to 2 pounds per week not more so you should reduce your calories with around 500 to 1000 per day.


1) Tomiyama AJ, Ahlstrom B, Mann T. (2013) Long-term effects of dieting: Is weight loss related to health? Social and Personality Psychology Compass; 7(12): 861-877.

2) Asher RC, Burrows TL, Collins CE. (2013) Very low-energy diets for weight loss in adults: a review. Nutrition and Dietetics; 70(2): 101-112.

08 Jan, 2015