How Many Calories Should I Eat?
Your complete guide to calculating daily calorie needs for weight loss, maintenance, or muscle gain — with a free calculator.
Quick answer: The average adult needs 1,600–2,400 calories/day (women) or 2,000–3,000 calories/day (men) depending on age, height, weight, and activity level. Use our calculator below for your exact number.
Understanding Your Calorie Needs
Your daily calorie need is called your Total Daily Energy Expenditure (TDEE). It's made up of three components:
Calories burned at rest
Exercise & movement
Digesting food
Calorie Needs by Age and Activity
| Age Group | Sedentary | Moderate | Active |
|---|---|---|---|
| Women 19-25 | 2,000 | 2,200 | 2,400 |
| Women 26-50 | 1,800 | 2,000 | 2,200 |
| Women 51+ | 1,600 | 1,800 | 2,000 |
| Men 19-25 | 2,400 | 2,800 | 3,000 |
| Men 26-50 | 2,200 | 2,600 | 2,800 |
| Men 51+ | 2,000 | 2,400 | 2,600 |
Source: USDA Dietary Guidelines for Americans, 2020-2025
For Weight Loss
To lose weight, you need a calorie deficit — eating fewer calories than your body burns. A safe deficit is 500-750 calories/day, which produces about 1-1.5 pounds of fat loss per week.
⚠️ Important: Never go below 1,200 calories/day (women) or 1,500 calories/day (men) without medical supervision. Extreme restriction slows metabolism and causes muscle loss.
For Muscle Gain
To build muscle, eat a calorie surplus of 250-500 calories/day above your TDEE, combined with resistance training. This supports muscle growth while minimizing fat gain.
🔢 Calculate Your Exact TDEE
Get your personalized calorie number based on your specific stats and goals.
Open Calorie Calculator →The Mifflin-St Jeor Formula
The most accurate formula for estimating BMR (and therefore TDEE):
📐 How We Calculate This
Our calculations follow clinical guidelines from the CDC, WHO, and NIH. BMI uses the standard formula: weight (kg) / height (m²). Caloric estimates use the Mifflin-St Jeor equation, validated as the most accurate resting metabolic rate formula.
These tools are for informational purposes and do not replace medical advice. Consult a healthcare provider for personalized health recommendations.
📚 Sources & References
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
Then multiply by your activity factor: Sedentary (×1.2), Light exercise (×1.375), Moderate (×1.55), Very active (×1.725), Extra active (×1.9).
Frequently Asked Questions
Is 1,200 calories a day enough?
For most adults, 1,200 calories is the minimum recommended for women and is too low for most men. At this level, it's difficult to get adequate nutrition. Consult a doctor before going this low.
How accurate are calorie calculators?
Online calculators are estimates within 10-15% of your actual needs. They're a great starting point — then adjust based on real results over 2-4 weeks.
Should I count calories?
Calorie counting works well for short-term goals but isn't necessary long-term. Many people find success with portion control and mindful eating instead.