How many calories should a woman eat per day?

A moderately active woman aged 26-30 needs about 2,000 calories to maintain weight. Sedentary: ~1,800. Very active: ~2,400. For weight loss, subtract 500 calories (1 lb/week loss). These are averages — your exact number depends on height, current weight, and muscle mass. Use a TDEE calculator for your personalized number.

How many calories should a man eat per day?

A moderately active man aged 26-30 needs about 2,600 calories to maintain weight. Sedentary: ~2,200. Very active: ~3,000+. For weight loss, a 500-calorie deficit targets 1 lb/week. Men generally need more calories due to higher muscle mass and larger frame size.

How many calories should I eat to lose weight?

Eat 500 fewer calories than your TDEE (Total Daily Energy Expenditure) to lose about 1 lb per week. A 1,000-calorie deficit targets 2 lbs/week, but going below 1,200 (women) or 1,500 (men) calories is not recommended without medical supervision. Calculate your TDEE first, then subtract.

What is the difference between BMR and TDEE?

BMR (Basal Metabolic Rate) is calories your body burns at complete rest — just to keep your organs functioning. TDEE (Total Daily Energy Expenditure) is BMR multiplied by an activity factor. TDEE is the number that matters for diet planning. BMR for a 30-year-old, 5'10", 180 lb man is about 1,800. TDEE at moderate activity: about 2,800.

How do I calculate my daily calorie needs?

Step 1: Calculate BMR using the Mifflin-St Jeor equation (most accurate). Step 2: Multiply by activity factor: sedentary (×1.2), lightly active (×1.375), moderately active (×1.55), very active (×1.725), extra active (×1.9). The result is your TDEE — the calories you need to maintain your current weight.

Do calorie needs change with age?

Yes. Metabolism slows about 1-2% per decade after age 20. A moderately active woman needs ~2,200 at age 20, ~2,000 at age 30, ~1,800 at age 50. Men: ~2,800 at 20, ~2,600 at 30, ~2,400 at 50. This is partly why people gain weight as they age without changing eating habits.

Is 1,200 calories enough?

1,200 calories is the minimum recommended for women trying to lose weight — and only for short-term use under medical guidance. Most women need 1,400-1,600 for sustainable weight loss. For men, the floor is typically 1,500 calories. Going too low slows metabolism, causes muscle loss, and leads to nutrient deficiencies.

How accurate are calorie calculators?

TDEE calculators are estimates within a 10-15% margin. The Mifflin-St Jeor equation is the most accurate general formula. For precision, track your actual weight changes over 2-3 weeks at a set calorie level — if weight stays stable, that is your true TDEE. Adjust from there.

How Many Calories Should I Eat Per Day? The Complete Guide by Age, Gender, and Goal

Last updated: April 20268 min readCalculator Tools

A moderately active 30-year-old woman needs about 2,000 calories per day. A man the same age needs about 2,600. But these are averages — your actual number depends on your height, weight, muscle mass, activity level, and whether you are trying to lose, maintain, or gain weight. Here is how to find your exact number.

Daily Calorie Needs by Age and Gender

These estimates are for moderately active adults (exercise 3-5 days/week):

Age	Women (Maintain)	Women (Lose 1 lb/wk)	Men (Maintain)	Men (Lose 1 lb/wk)
18-20	2,200	1,700	2,800	2,300
21-25	2,100	1,600	2,700	2,200
26-30	2,000	1,500	2,600	2,100
31-35	2,000	1,500	2,600	2,100
36-40	1,900	1,400	2,500	2,000
41-45	1,900	1,400	2,500	2,000
46-50	1,800	1,300	2,400	1,900
51-55	1,800	1,300	2,300	1,800
56-60	1,700	1,200	2,200	1,700
61-65	1,700	1,200	2,200	1,700
66+	1,600	1,200*	2,000	1,500

*Do not go below 1,200 (women) or 1,500 (men) without medical supervision. Numbers rounded to nearest 100.

How to Calculate Your Exact Number

The table above is a starting point. For your personalized calorie target, use this two-step process:

Step 1: Calculate Your BMR (Mifflin-St Jeor Equation)

Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

Example: 30-year-old woman, 5'6" (167 cm), 150 lbs (68 kg):
BMR = (10 × 68) + (6.25 × 167) − (5 × 30) − 161 = 680 + 1,044 − 150 − 161 = 1,413 calories

Step 2: Multiply by Activity Factor to Get TDEE

Activity Level	Description	Multiplier	Example (BMR 1,413)
Sedentary	Desk job, no exercise	× 1.2	1,696 cal
Lightly Active	Light exercise 1-3 days/week	× 1.375	1,943 cal
Moderately Active	Moderate exercise 3-5 days/week	× 1.55	2,190 cal
Very Active	Hard exercise 6-7 days/week	× 1.725	2,437 cal
Extra Active	Athlete, physical job + training	× 1.9	2,685 cal

Calorie Targets by Goal

Goal	Calorie Adjustment	Expected Result	Timeline
Lose weight (slow)	TDEE − 250	0.5 lb/week loss	Sustainable long-term
Lose weight (standard)	TDEE − 500	1 lb/week loss	Recommended for most people
Lose weight (aggressive)	TDEE − 750	1.5 lb/week loss	Short-term only
Maintain weight	TDEE ± 0	Weight stays stable	Indefinite
Gain muscle (lean bulk)	TDEE + 250	0.5 lb/week gain	Minimize fat gain
Gain weight (bulk)	TDEE + 500	1 lb/week gain	Some fat gain expected

Why Online Calculators Give Different Numbers

Different calculators use different equations:

Equation	Used By	Accuracy
Mifflin-St Jeor	Most modern calculators	✓ Most accurate for most people
Harris-Benedict (revised)	Some older tools	~Within 5% for most adults
Katch-McArdle	Bodybuilding sites	✓ Most accurate if you know body fat %
WHO/FAO	Government guidelines	~Good for populations, less individual accuracy

The Mifflin-St Jeor equation is considered the gold standard for healthy adults. If you know your body fat percentage, Katch-McArdle may be more accurate because it factors in lean body mass.

Common Mistakes That Throw Off Your Count

Overestimating activity level: Walking around the office is not "moderately active." Be honest — most people with desk jobs are sedentary or lightly active, even if they exercise 3 times a week.
Not counting liquid calories: A daily latte (250 cal) + evening beer (150 cal) = 2,800 extra calories per week — nearly 1 lb of fat.
Ignoring cooking oils: 1 tablespoon of olive oil = 120 calories. A generous pour while cooking can add 300-500 uncounted calories.
Weekend calorie amnesia: Eating 1,800 cal on weekdays but 3,500 on weekends averages to 2,286/day — enough to stall weight loss entirely.

Tool Workflow: Get Your Exact Number

Calorie Calculator — enter your stats and get your TDEE instantly
Body Fat Calculator — for a more accurate Katch-McArdle BMR estimate
BMI Calculator — check where you fall on the BMI scale
Percentage Calculator — calculate macronutrient percentages
Discount Calculator — quick math for meal-prep bulk buying

When These Numbers Do Not Apply

Calorie calculators are estimates for typical adults. They are less accurate for: pregnant or breastfeeding women (need 300-500 extra cal/day), people over 70 (metabolism varies widely), athletes training 2+ hours daily (may need 4,000+ calories), people with thyroid conditions or hormonal disorders, and anyone recovering from surgery or illness. In these cases, work with a registered dietitian for personalized guidance.

Calculate your exact daily calorie needs right now — enter your age, height, weight, and activity level.

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How Many Calories Should I Eat Per Day? The Complete Guide by Age, Gender, and Goal

Daily Calorie Needs by Age and Gender

How to Calculate Your Exact Number

Step 1: Calculate Your BMR (Mifflin-St Jeor Equation)

Step 2: Multiply by Activity Factor to Get TDEE

Calorie Targets by Goal

Why Online Calculators Give Different Numbers

Common Mistakes That Throw Off Your Count

Tool Workflow: Get Your Exact Number

When These Numbers Do Not Apply

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