Calorie Calculator

Find your daily calorie needs — how much to eat to lose weight, maintain, or gain — based on your body stats and activity level.


Calorie Calculator Guide

Everything you need to know about how the calculator works, the science behind it, and how to use calories to reach your goals.

What is a Calorie Calculator?

A calorie calculator is a tool that estimates how much energy — measured in calories — your body needs each day. It combines your body stats (age, sex, height, weight) with your activity level to estimate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE), giving you a practical starting point for managing your weight.

How Does the Calorie Calculator Work?

  1. You enter your age, sex, height, weight, and activity level.
  2. It estimates your BMR — calories burned at complete rest.
  3. BMR × activity multiplier = your TDEE (maintenance calories).
  4. Targets for loss, mild loss, maintenance, mild gain, and gain are shown.
  5. Your target calories are split into suggested protein, fat, and carbs.

How Important Is Calorie Counting?

It's a useful tool for building awareness of how much you actually eat compared to how much your body needs — many people underestimate portion sizes significantly. It's not the only way to manage weight, but it replaces guesswork with objective data, which helps most when starting out or when progress has stalled.

Is Calorie Counting Important for Weight Loss?

Weight loss comes down to consistently consuming fewer calories than you burn — a calorie deficit. Counting is one of the most direct ways to create and maintain that deficit reliably. It's a tool, not a requirement, though — some people succeed with portion control or intuitive eating instead. Consistency matters more than the method.

What Are the Weight Loss Steps When Measuring Calories?

  1. Calculate your maintenance calories (TDEE).
  2. Choose a moderate, sustainable deficit.
  3. Track intake consistently to build awareness.
  4. Weigh in regularly and follow the weekly trend.
  5. Adjust your target as your weight changes.

What Are the Equations Used for the Calculations?

This tool supports three well-established formulas for estimating BMR (Basal Metabolic Rate):

Mifflin-St JeorRecommended
Men
10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
Women
10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161
Revised Harris-BenedictClassic
Men
13.397 × w + 4.799 × h − 5.677 × age + 88.362
Women
9.247 × w + 3.098 × h − 4.330 × age + 447.593
Katch-McArdleUses body fat %
Men
370 + 21.6 × lean mass(kg)
Women
370 + 21.6 × lean mass(kg)

Once BMR is calculated, it's multiplied by an activity factor (1.2–1.9) to estimate your TDEE — the total calories you burn in a day, including movement and exercise.

More Questions

Frequently Asked Questions

TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns in a day, including everything from breathing and digestion to walking and exercise. It's calculated by taking your BMR (calories burned at rest) and multiplying it by an activity factor. Your TDEE is the same number shown as "maintenance calories" in your results, and it's the baseline every other target (loss, gain, etc.) is built from.

Pick the level that best matches your typical week, not just your best or worst day. Most people overestimate how active they actually are — if you're unsure, it's usually safer to round down.

LevelDescriptionMultiplier
SedentaryLittle or no exercise, desk job1.2
Light ExerciseExercise 1–3 times/week1.375
Moderate ExerciseExercise 4–5 times/week1.465
Heavy ExerciseDaily exercise or intense 3–4x/week1.55
AthleteIntense exercise 6–7 times/week1.725
Extra ActiveVery intense daily training or physical job1.9

It depends on your age, sex, height, weight, and how active you are. Most adults fall somewhere between roughly 1,600 and 3,000 calories per day at maintenance, but this range varies a lot from person to person. Use the calculator with your own stats for a much more personalized estimate.

Your maintenance calories are simply your TDEE — BMR multiplied by your activity level. This is the number shown at the top of your results after you calculate. Eating at this level, on average, should keep your weight roughly stable over time.

Start from your maintenance calories (TDEE), then subtract a deficit. A moderate deficit of around 250–500 calories per day generally supports a gradual, sustainable rate of loss of about 0.25–0.5 kg (roughly 0.5–1 lb) per week. The calculator shows these targets automatically once you calculate.

That depends on your goal. To maintain your current weight, eat around your TDEE. To lose weight, eat somewhat below it; to gain, eat somewhat above it. The calculator's target cards give you concrete daily numbers for each of these goals based on your own stats.

General guidelines suggest most adults shouldn't go below roughly 1,200 calories/day (women) or 1,500 calories/day (men) without medical supervision, since very low intakes can make it hard to get enough nutrients and can affect energy, mood, and metabolism. If you're considering an aggressive deficit, check in with a doctor or registered dietitian first.

A calorie deficit happens when you consistently consume fewer calories than your body burns. Your body makes up the difference by using stored energy — largely body fat — which is why a sustained deficit leads to weight loss over time. The size of the deficit determines how fast that happens.

Benefits: builds awareness of portion sizes and eating habits, provides objective data instead of guesswork, and creates accountability toward a goal.

Risks: tracking can become overly rigid or stressful for some people, food data isn't always perfectly accurate, and close monitoring of food can contribute to an unhealthy relationship with eating for some individuals. If counting starts to feel obsessive or distressing, step back and talk to a healthcare provider.

On average, walking a mile burns somewhere around 80–100 calories, though this varies with your body weight, pace, and terrain. As a rough rule of thumb, walking burns approximately 0.5–0.75 calories per kilogram of body weight per mile.

Rough calorie counts for everyday foods, for quick reference:

FoodServingCalories
Apple1 medium~95
Banana1 medium~105
Egg1 large~70
White bread1 slice~80
Chicken breast (cooked)100 g~165
Salmon (cooked)100 g~208
White rice (cooked)1 cup~205
Avocado1 whole~240
Almonds1 oz (28 g)~164
Broccoli1 cup~55

Exact values vary by brand, ripeness, and preparation — use these as ballpark figures.

A few example meals to help you gauge portion sizes against your target:

MealExampleCalories
Light breakfastOatmeal with banana~350
Standard lunchGrilled chicken salad~500
Large dinnerPasta with meat sauce~750
SnackProtein bar~200
Fast food comboBurger, fries, soda~900–1,100

Totals vary widely with ingredients and portion size — these are typical examples, not fixed rules.

Approximate calories burned in 30 minutes, for an average adult (~70 kg / 155 lb):

ActivityCalories (30 min)
Walking (3 mph)~120
Cycling (moderate pace)~250
Swimming (laps)~250
Running (6 mph)~300
Weight training~130
Yoga~120
HIIT / circuit training~350

Actual burn depends heavily on body weight, intensity, and fitness level — heavier or more intense efforts burn more.

Every gram of macronutrient carries a fixed amount of energy:

ComponentCalories per gram
Carbohydrates4 kcal/g
Protein4 kcal/g
Fat9 kcal/g
Alcohol7 kcal/g

This is why the macronutrient breakdown on your results page converts protein and carbs at 4 cal/g and fat at 9 cal/g.

A friendly reminder: calorie estimates are a helpful starting point, not an exact science. Everyone's body responds a little differently, so use these numbers as a guide, listen to your body, and check in with a healthcare provider before making major changes to your diet.