How Many Calories Should I Eat Per Day? (By Goal and Body Type)

"How many calories should I eat?" is one of the most Googled nutrition questions in the world — and one of the most individually variable. A petite sedentary woman may maintain her weight at 1,600 kcal. A tall active man may need 3,200 kcal to do the same. General advice like "eat 2,000 calories" is useless without personalisation.

This guide shows you how to calculate your exact number, adjust for your goal, and apply it practically.

Step 1: Calculate Your BMR

Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest — just to keep your heart beating, lungs breathing, and organs functioning. It accounts for roughly 60–70% of total calorie burn.

Mifflin-St Jeor equation (most accurate):

For women: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161

For men: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5

Example — 30-year-old woman, 65kg, 165cm: BMR = (10 × 65) + (6.25 × 165) − (5 × 30) − 161 = 650 + 1,031 − 150 − 161 = 1,370 kcal

Step 2: Multiply by Your Activity Level (TDEE)

Your TDEE (Total Daily Energy Expenditure) is your actual daily calorie burn — BMR adjusted for how active you are.

Continuing the example — moderately active: TDEE = 1,370 × 1.55 = 2,124 kcal/day (maintenance)

Step 3: Adjust for Your Goal

Once you know your TDEE, the adjustment is straightforward:

For our example woman targeting moderate fat loss: 1,624 − 500 = 1,624 kcal/day

Real-World Reference Calorie Ranges

While individual needs vary, these ranges cover the majority of adults:

Women

Men

These are starting points — individual variation can be 30% in either direction.

Why "Eat 2,000 Calories" Is Often Wrong

The 2,000 kcal daily reference was set in the 1990s for food labelling purposes based on average estimates. It:

• Is too high for many sedentary women (their TDEE may be 1,700–1,800 kcal)
• Is too low for active men (who may need 2,500–3,000 kcal at maintenance)
• Doesn't account for body composition (a muscular person burns more at rest)
• Doesn't adjust for goal

Your number is yours. Calculate it properly and use it.

How to Track Your Calories

1. Use a food scale — measuring cups are inaccurate for calorie-dense foods (1 tablespoon of peanut butter can be 80 kcal or 180 kcal depending on how generous you are)
2. Use an app — MyFitnessPal, Cronometer, or MacroFactor have large food databases with barcode scanning
3. Track for 2–4 weeks — after this period, most people develop accurate portion intuition and can relax the tracking

What If the Calculation Isn't Working?

If you're eating at your calculated target but not seeing expected results:

Not losing weight despite being at a calculated deficit:

• Your TDEE calculation may be overestimated (common with fitness trackers)
• Tracking may have creep errors — weigh food for one week with a scale
• Your actual activity level may be lower than selected

Losing weight too fast (>1kg/week):

• Your deficit is likely larger than intended
• Increase calories by 150–200 kcal, prioritise from carbohydrates
• Ensure protein is at minimum 1.6g/kg to protect muscle

Not gaining muscle despite eating above maintenance:

• Check that protein is 1.6–2.2g/kg
• Progressive overload in training is the primary driver — nutrition supports it
• If gaining fat too fast, reduce surplus to 150–200 kcal above TDEE

The Bottom Line

Your daily calorie needs = BMR × activity multiplier (TDEE). Subtract 300–500 kcal to lose fat, add 200–350 kcal to build muscle, or maintain at TDEE.

Use the TDEE Calculator to get your personalised number in 60 seconds — no manual maths required.

Sources

1. Comparison of predictive equations for resting metabolic rate — Frankenfield et al., Journal of the American Dietetic Association, 2005
2. Energy balance and its components — Hall et al., American Journal of Clinical Nutrition, 2012
3. NHS: Understanding calories — NHS, 2023