Calorie Deficit Calculator

You are trying to figure out how many calories you need. You want a simple tool that gives you a clear number you can use today. This calculator does that for you.

It estimates your BMR, your activity level, and the calorie target you need for weight loss. You only need to answer a few questions. Your results will update step by step so you always know what is happening and why.

Basal Metabolic Rate

Basal metabolic rate is the number of calories your body burns at rest each day. It covers the energy you need for breathing, circulation, digestion, and basic organ function.

Your age, sex, height, and weight drive this number. BMR gives you a starting point so you can calculate your total daily needs.

Activity Level

Activity level tells you how many calories you burn on top of your BMR. It includes your daily movement, workouts, and the physical demands of your routine.

There are categories that your activity level could fall in. Read the description of each and pick the one the best describes your current lifestyle.

Sedentary
You sit most of the day. You do little structured exercise. Office work fits here.

Lightly active
You get in light movement most days. You walk more than average or train one to three times per week.

Moderately active
You move often. You train three to five times per week and stay on your feet more during the day.

Very active
You train hard. You lift or do cardio five to seven days per week. Your job or routine keeps you moving.

Super active
You have a physically demanding job or you train twice per day. You push high weekly training volumes.

Calorie deficit

A calorie deficit happens when you eat fewer calories than your body burns. If your maintenance level is 2000 calories and you eat 1600, you create a 400 calorie deficit.

Most people do best with a deficit of 5 to 25 percent below maintenance. This range helps you lose weight without feeling drained or hungry all the time.

What to expect

Your rate of weight loss depends on your weekly deficit. One pound of fat holds about 3500 calories.

If you average a 500 calorie deficit each day for a week, your total deficit is about 3500 calories. That usually shows up as about one pound of fat loss. A 250 calorie daily deficit adds up to about 1750 calories per week. That usually shows up as about half a pound of fat loss.

Your results can shift based on changes in water, digestion, training, sleep, and stress. Focus on the weekly trend instead of the day to day swings.