How many calories should I eat to lose weight?

A deficit of 500 calories per day typically results in about 1 pound of weight loss per week.

Basal Metabolic Rate is the calories your body burns at rest to maintain basic functions.

Do calorie needs change with age?

Yes, BMR decreases with age, so calorie needs generally decline over time.

How to Calculate Daily Calorie Needs

A calorie calculator estimates how many calories you need daily based on your metabolism and activity level. It is essential for managing weight and nutrition goals.

The Formula

Calories = BMR x Activity Factor

Where:

CaloriesDaily Calories — Total calories needed per day

BMRBasal Metabolic Rate — Calories burned at complete rest

AFActivity Factor — Multiplier based on activity level

Step-by-Step Example

Here's how to calculate daily calorie needs step by step:

1Calculate BMR: Use the Mifflin-St Jeor equation with your age, sex, weight, and height.
2Assess activity level: Choose a factor from sedentary (1.2) to very active (1.9).
3Multiply: Multiply BMR by your activity factor for total daily calorie needs.

Following these 3 steps gives you the final daily calorie needs value.

Skip the Math

A 30-year-old man (175 cm, 80 kg) with moderate activity has a BMR of about 1,800 and needs roughly 2,800 calories daily.

Use the Free Calculator

Why You Need This Calculation

Knowing your daily calorie needs is the foundation for any weight loss, gain, or maintenance plan.

Common Mistakes

Overestimating activity level.

Be honest about your exercise frequency; most people are lightly active.

Using outdated BMR equations.

The Mifflin-St Jeor equation is considered the most accurate for most adults.

Ignoring non-exercise activity.

Walking, fidgeting, and daily tasks contribute significantly to calorie burn.