Calorie Calculator

What Is the Calorie Calculator?

The Calorie Calculator helps you estimate the number of calories you burn every day. It calculates your Basal Metabolic Rate (BMR) and your Total Daily Energy Expenditure (TDEE) based on your physical attributes and activity level. With this information, you can set precise targets for weight loss, maintenance, or weight gain.

Practical Examples & Reference Guide

Example 1: Planning for Weight Loss

A 30-year-old female weighing 70 kg, who is 165 cm tall and moderately active, wants to lose weight. Her BMR is around 1,440 calories, and her TDEE is about 2,230 calories. To lose 0.5 kg a week, she should consume approximately 1,730 calories daily.

Example 2: Bulking Up

A 25-year-old male weighing 75 kg, who is 180 cm tall and very active (working out 6 days a week), wants to gain muscle. His TDEE is around 3,250 calories. To gain weight at a healthy pace, he needs a surplus, pushing his recommended daily intake to around 3,750 calories.

In-Depth Technical Guide

Understanding the BMR Formulas

Our calculator provides three distinct formulas to estimate your Basal Metabolic Rate (BMR):

1. Mifflin-St Jeor Equation (Default)

Currently considered the most accurate formula for the general population. It factors in weight, height, age, and gender to provide a highly reliable BMR estimate.

2. Revised Harris-Benedict Equation

The classic formula used for decades. It tends to slightly overestimate BMR in obese individuals but remains widely respected and utilized in clinical settings.

3. Katch-McArdle Formula

Unlike the others, this formula doesn't use age or gender. Instead, it relies on your Lean Body Mass (LBM) by subtracting your Body Fat Percentage. This makes it incredibly accurate for athletes and those with very high or very low body fat.

Why Katch-McArdle Needs Body Fat Percentage

Unlike Mifflin-St Jeor or Harris-Benedict, Katch-McArdle doesn't estimate metabolism from age and gender averages — it calculates BMR directly from your Lean Body Mass Calculator result, since muscle tissue burns significantly more calories at rest than fat tissue does. This is why two people of identical age, height, and weight can have meaningfully different BMR under this formula: the one with more muscle and less fat will burn more calories at rest, and Katch-McArdle is built to reflect that difference rather than average it away.

Activity Multipliers (TDEE)

Your BMR is the energy your body burns at rest. To find your Total Daily Energy Expenditure (TDEE), your BMR is multiplied by an activity factor:

The Six Activity Levels Explained

Activity Level	Description	Multiplier
Sedentary	Little to no exercise	BMR × 1.2
Light	Exercise 1–3 times a week	BMR × 1.375
Moderate	Exercise 4–5 times a week	BMR × 1.55
Active	Daily exercise or intense exercise 3–4 times a week	BMR × 1.725
Very Active	Intense exercise 6–7 times a week	BMR × 1.9
Extra Active	Very intense daily exercise or a physically demanding job	BMR × 2.1

Most people overestimate their own activity level — someone who works a desk job and exercises three times a week is Light or Moderate, not Active, even if the workouts themselves are intense, since this multiplier is meant to reflect the whole week, not just training days.

How Many Calories Should You Eat? (By Goal)

Calories for Weight Loss

A calorie deficit — eating fewer calories than your TDEE — is required to lose weight. A moderate deficit of roughly 500 calories per day below TDEE typically produces about 0.5 kg (1 lb) of weight loss per week, which is generally considered a sustainable pace that limits muscle loss. Larger deficits can speed up short-term results but raise the risk of fatigue, muscle loss, and difficulty sustaining the plan.

Calories for Maintenance

Eating at or near your TDEE keeps your weight roughly stable over time. This is the number worth targeting during a maintenance phase between a cutting and bulking cycle, or simply when weight change isn't the current goal.

Calories for Weight Gain

A calorie surplus — eating more than your TDEE — is required to gain weight. A surplus of roughly 250 to 500 calories per day above TDEE supports a gradual, mostly-muscle gain when paired with resistance training, while larger surpluses lead to faster weight gain but a higher proportion of that gain coming from fat.

A Note on Bulking Speed: Lean Gain vs Fast Gain

A smaller surplus (around 250 calories) combined with consistent strength training tends to favor muscle over fat gain, often called "lean bulking." A larger surplus (500+ calories) produces faster scale weight gain but a higher share of that gain is typically fat, which usually means more time later spent on a cut to reach the same physique. Neither approach is universally "correct" — the right choice depends on how much someone prioritizes speed versus body composition during the gaining phase.

Calorie Calculator vs BMR Calculator: What's the Difference?

These two tools are closely related but answer different questions, which is why they're listed side by side in Recommended Tools. The BMR Calculator isolates one number: the calories your body burns at complete rest, with no activity factored in at all. The Calorie Calculator (this page) starts from that same BMR calculation but adds an activity multiplier on top of it to produce TDEE — your total daily burn including movement and exercise — and then goes a step further by translating that TDEE into practical daily calorie targets for weight loss, maintenance, or weight gain. In short: use the BMR Calculator if you only want your resting metabolic number, and use this Calorie Calculator when you want a full daily target based on your actual activity level and goal.