Weight Loss Percentage Calculator: Why you need it

Weight Loss Percentage Calculation

Weight Loss Percentage Calculator is an essential tool needed during your weight loss journey. No matter the amount of weight you’re trying to lose, keeping track of your weight helps to keep you motivated. There are some days when you’re not going to see huge results when you stand in front of the mirror, but with the calculator, you can monitor your progress toward ultimate goals.


As you keep a record of the pounds you lose, you can as well calculate the percentage of weight you lose. To calculate your weight loss percentage is an easy thing to do and do can do this nat the comfort of your home however, you might need an expert to measure your body fat percentage.

Orange, calculator and notebook on a table

Weight loss percentage calculator:

How to calculate weight loss percentage

Pick a day in a week for your “official” weigh-in. Normally, you’re meant to check your weight in the morning right after you go to the bathroom. This is to get an accurate measurement without your food intake for the day affecting the weight measurement. You’ll have to finish at least two weigh-ins to calculate your weight loss.

Here’s an equation you can use to calculate your weight loss for the week:

Weekly Weight Loss %= [(Last week’s weight – This week’s weight) / Last week’s weight] x 100

There’s also a similar equation you can use to know how much weight you’ve lost over a longer period. To use this equation you have to compare your current weight to your starting weight:

Total Weight Loss %= [ (Starting weight – Current weight) / Starting weight ] x 100.

With this equation, you’ll know the percentage of your bodyweight you’ve lost in total- not just in the last week.

Here’s an example

I know the equations might seem confusing but I can assure you once start using real numbers, you’ll get used to it. The math becomes a lot simpler. Here’s an example to help with that.

Let’s say a woman of 150-pounds wants to lose weight. Then in her first week, she sheds 2 pounds — reducing her weight to 148 pounds, this is how she can calculate her percentage of weight loss:

Weekly Weight Loss %= [(150 – 148) / 150 ] x 100 Weekly 

Weight Loss Percent = [ 2 / 150 ] x 100

Weekly Weight Loss % = 1.33

If by next week she loses another 2 pounds — Now her weight has reduced from 148 to 146 pounds. Now her weekly weight loss is:

Weekly Weight Loss % = [ (148 – 146) / 148 ] x 100 

Weekly Weight Loss % = [ 2 / 148 ] x 100 

Weekly Weight Loss % = 1.35

When she reaches her weight loss goal — let’s say it’s 125 pounds — she could use the equation below to calculate her total percentage weight loss: 

Total Weight Loss % = [ (150 – 125) / 150 ] x 100 

Total Weight Loss % = [ 25 / 150 ] x 100 

Total Weight Loss %= 16.67

Throughout her weight loss journey, she’s lost 25 pounds, which is 16.67% of her original weight.

Weight Loss Percent Vs. Fat Loss Percent

I’m sure you now know how easy it is to know the percentage of your weight loss, but do you know that not all of the weight necessarily comes from fat. We all know you lose fat as you shed weight while doing that you may also lose water weight and muscle tissue. This means your percentage of fat loss may not be the same as your overall weight loss. Especially if you lose weight by dieting (or eating less junk foods), that means you’ll lose more muscle compared to when you slowly lose fat. 

blue measuring tape on scale

Sadly it’s a bit confusing to know your body fat loss in your home. You’ll have to consult an expert. A doctor or sports clinic professional can do this for you by using skinfold calipers or body scans to measure your fat levels. Also, repeated readings can help know the amount of your weight loss that comes from fat. In my view, if you’re worried about your fat levels, I recommend professional testing even if you have a healthy body weight.

What Percentage You Should Expect

While you should focus on moderate weight reduction at least 1 or 2 pounds a week – there’s no standard weekly weight-reduction rate. The reason why is because when you lose 1 to 2 pounds a week, your weight loss percentage will change depending on your starting weight. For instance, if a 160-pound woman loses 2 pounds, she will have lost 1.25% of her body weight. In the final analysis focus on losing 4 to 8 pounds each month. According to the American Council on Exercise, the recommended rate of fat loss is a maximum of 1% of your body fat each month

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