A Diet Calorie Calculator for Your Daily Calorie Needs

Estimate how many calories your body needs each day and each week. Adjust the goal to see a realistic starting target for maintaining, gaining or losing weight.

How This Calories Calculator Works

Enter your age, sex, weight, height, and general activity level to map out your baseline daily burn. You'll get estimates for maintaining, cutting, or bulking. Treat these numbers as a smart starting point—monitor your weight for two weeks and adjust your portions based on real-world results, not rigid math.

How to Use the Diet Calorie Calculator

Start dialing in your diet plan by punching in your age, current weight, and height in feet and inches (like 5' 10"). Choose your biological sex to lock in the baseline metabolic formula, then pick an activity level that honestly reflects an average week.

Look at your entire routine—not just dedicated gym time. An office worker pacing through 10,000 steps burns energy on a completely different scale than someone lifting freight in a warehouse or sitting behind a desk for eight hours straight.

Once your numbers are plugged in, hit "Calculate my calories" to generate your daily diet and calorie targets.

Making Sense of Your Results

• Daily Maintenance: This is your break-even point. It's the baseline energy your body demands to keep your current weight stable. The diet calorie calculator uses the Mifflin–St Jeor formula to determine your Basal Metabolic Rate (BMR)—what your organs burn purely at rest—before scaling that up with your activity tier.

• Weight Loss: Drops 500 calories under maintenance to support a steady one-pound-per-week loss. The tool floors this output at 1,200 calories per day to keep intake from dipping dangerously low.

• Weight Gain: Adds 500 calories above maintenance for lean mass additions or recovery.

Why Look at Weekly Calories?

Real life rarely matches a rigid 24-hour box. Multiplying your daily target by seven gives you an overall weekly fuel budget. This makes social dinners, heavy training days, or lighter rest days far easier to manage without blowing your targets—eating a little more on Saturday just means shaving a few bites off Tuesday.

Treat the Math as a Starting Point

No algorithm can scan your thyroid, lean muscle mass, or medication list. The number on the screen is a calculated estimate, nothing more.

Take your result, eat at that target for two to three weeks, and track the scale trend. Don't sweat daily morning water spikes or sodium bloat; look for the weekly average to move. If you're pregnant, nursing, or managing a metabolic condition, skip the automated tools and dial in your targets with a registered dietitian.