Daily Calorie Needs Calculator – How Many Calories Should You Eat?

Find out exactly how many calories you need each day with our daily calorie needs calculator. Personalized results based on your age, weight, height, and activity level.

Gender

Unit System

Age (years)

Height (cm)

Weight (kg)

Activity Level

Understanding Your Calorie Needs

BMR vs TDEE explained

BMR (Basal Metabolic Rate) is what you'd burn lying in bed all day – breathing, circulating blood, cell repair. It's your body's idle power consumption. For most people, BMR is 1200-1800 calories.

TDEE (Total Daily Energy Expenditure) includes everything: BMR plus walking, exercising, digesting food, even fidgeting. TDEE is typically 1.2-1.9× your BMR depending on activity. This is your maintenance calories – eat this much and weight stays stable.

Calorie Deficits and Surpluses

Goal	Calorie Adjustment	Expected Change
Extreme loss	-25% TDEE	~1.5 lb/week (not recommended long-term)
Weight loss	-15% TDEE	~1 lb/week (sustainable)
Mild loss	-10% TDEE	~0.5 lb/week (easy to maintain)
Maintain	0% (eat at TDEE)	Weight stable
Mild gain	+5% TDEE	~0.25 lb/week (lean bulk)
Weight gain	+10% TDEE	~0.5 lb/week (muscle gain)

Activity Level Guide

Choosing the right multiplier

Level	Multiplier	Description
Sedentary	1.2	Desk job, little or no exercise, mostly sitting
Lightly Active	1.375	Light exercise 1-3 days/week, or standing job
Moderately Active	1.55	Moderate exercise 3-5 days/week, or active job
Active	1.725	Hard exercise 6-7 days/week, or physical job
Very Active	1.9	Very hard exercise daily, or labor-intensive job

Be honest about your activity level. Most people overestimate. "Lightly Active" means you actually work out 1-3 times per week, not that you walked to the car.

Calorie Needs by Age and Gender

General guidelines (moderately active)

Age	Women (calories/day)	Men (calories/day)
18-25	2,000-2,200	2,400-2,800
26-35	1,900-2,100	2,300-2,700
36-45	1,800-2,000	2,200-2,600
46-55	1,700-1,900	2,100-2,500
56-65	1,600-1,800	2,000-2,400
65+	1,500-1,700	1,900-2,300

These are averages for moderately active adults. Individual needs vary based on weight, height, muscle mass, and actual activity level. Use the calculator above for personalized results.

Frequently Asked Questions

How accurate is this calorie calculator?

The Mifflin-St Jeor equation used here is accurate within about 10% for most people. That's ±200-300 calories for average adults. Use the result as a starting point, then adjust based on actual results over 2-4 weeks.

Why am I not losing weight at my calculated deficit?

Common reasons: underestimating food intake (people typically undercount by 30-50%), overestimating activity, water retention masking fat loss, or your actual TDEE is lower than calculated. Track everything precisely for 2 weeks, then adjust.

Should I eat back exercise calories?

If you calculated TDEE correctly with your actual activity level, no – it's already included. Fitness trackers notoriously overestimate calories burned. If you use sedentary TDEE and exercise separately, add back 50-75% of tracked calories (they overestimate).

How low can I go on calories?

Minimum safe intake: 1,200 calories/day for women, 1,500 for men. Below this, it's hard to get adequate nutrients. Very low calorie diets (under 800) should only be done under medical supervision. Slow loss is more sustainable anyway.

Do calorie needs change with weight loss?

Yes. As you lose weight, your BMR drops – smaller bodies need fewer calories. Recalculate every 10-15 lbs lost. Also, metabolic adaptation can reduce TDEE by an extra 5-15% beyond what weight loss alone predicts.

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Daily Calorie Needs Calculator – How Many Calories Should You Eat?

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