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Precision Nutrition's Weight Loss Calculator

We’ve made it easy to understand what it really takes to lose weight.
Our weight loss calculator will help you determine the calorie deficit you need to reach your goals faster.

step 1 of 5

Let's start by getting to know you

Choose unit system

Choose unit system

What's your age?
How tall are you?
How much do you weigh right now?
What's your biological sex?

Developed by Brian St. Pierre, MS, RD, and the Precision Nutrition Team.

Calculating Calories for Weight Loss Made Easy

One of the most common questions Precision Nutrition certified nutrition coaches get from their new clients: Our weight loss calculator—based on the NIH Body Weight Planner and adapted from research collected at the National Institute of Diabetes and Digestive and Kidney Diseases—takes into account the adaptive nature of metabolism. This helps make sure that, as you eat less, and your metabolism slows, you continue to stay in the necessary calorie range to meet your goals.

By inputting details about your lifestyle and habits in just a few easy steps, our weight loss calculator can give you more accurate information on how many calories you’ll need to eat (and how long it may take) to reach your weight loss goals.

Features of Weight Loss Calorie Calculator

Our calorie deficit calculator helps you lose weight by taking into account a number of different factors about your lifestyle, habits, preferences, and metabolism.

What is a Calorie Deficit for Weight Loss?

A calorie deficit refers to when someone consumes fewer calories than the amount needed to power the body’s essential functions and daily activities.

A calorie deficit is important for weight loss because when the body receives fewer calories than it needs to power those daily activities, it starts breaking down body fat (and sometimes muscle) for fuel. This is what results in weight loss.

Eating in a calorie deficit is necessary for weight loss, but as you lose weight—or as your body composition changes—so will your metabolism. It’s important to keep these changing calorie needs in mind to maintain an effective calorie deficit throughout your weight loss journey.

Weight Loss Calculator & Calorie Tracking FAQs

We Can Support You on Your Weight Loss Journey

A new nutrition and fitness plan can seem daunting, but you don’t have to do it on your own. The coaches at Precision Nutrition can help you build habits that improve your physical and mental health, bolster your immunity, help you better manage your stress, and get sustainable weight loss results.