🔥 Nutrition
How Many Calories Should I Eat Per Day? Complete Personalised Guide (2026)
Find out exactly how many calories you need per day based on your size, age, and activity level. Science-based guide with ranges for every goal. Updated January 2026.
Key Takeaways
- Most adults need 1,600–3,000 calories per day depending on size and activity
- NHS averages of 2,000 (women) and 2,500 (men) are rough population averages — not personalised
- Your TDEE is your true personalised calorie need — use our calculator
- Eating 500 calories below TDEE produces approximately 0.5 kg of fat loss per week
- Never eat below 1,200 cal (women) or 1,500 cal (men) without medical supervision
In This Article
What Determines Your Calorie Needs?
Your total daily energy expenditure (TDEE) has four components: Basal Metabolic Rate (BMR — calories burned at complete rest), physical activity level, thermic effect of food (~10% of intake), and non-exercise activity thermogenesis (NEAT — all movement outside formal exercise).
60–70%
of TDEE comes from resting metabolism (BMR)
500 cal
daily deficit = ~0.5 kg fat loss per week
200–400
Fewer calories needed at 60 vs 25 (same size/activity)
Estimated Daily Calorie Needs by Activity
| Activity Level | Women (avg) | Men (avg) | Description |
|---|---|---|---|
| Sedentary | 1,600–1,800 | 2,000–2,200 | Desk job, minimal movement |
| Lightly active | 1,800–2,000 | 2,200–2,500 | Light exercise 1–3 days/week |
| Moderately active | 2,000–2,200 | 2,500–2,800 | Moderate exercise 3–5 days/week |
| Very active | 2,200–2,600 | 2,800–3,200 | Hard exercise 6–7 days/week |
| Extremely active | 2,600–3,000+ | 3,200–4,000+ | Physical job + daily training |
Calories for Specific Goals
Weight Loss: Create a Deficit
Subtract 300–500 calories from your TDEE. This produces 0.3–0.5 kg of fat loss per week — slow but predominantly fat (not muscle). Never go below 1,200 cal (women) or 1,500 cal (men). Larger deficits increase muscle loss and metabolic adaptation.
Muscle Building: Slight Surplus
Eat 200–300 calories above TDEE. This supports approximately 0.25 kg of lean tissue per week for natural trainers, minimising fat gain.
Pregnancy (Additional Calories)
First trimester: no extra needed. Second trimester: +300 cal/day. Third trimester: +500 cal/day (NHS guidelines). These are above your pre-pregnancy TDEE.
✅ Most Accurate Way to Find Your Calorie Needs
Calculate your TDEE (use our free calculator above), then adjust based on 4 weeks of real results. If weight is not moving in the expected direction, adjust by 100–200 calories. Your body's response is the most accurate calorie counter available.🔢 Free Tool
TDEE Calorie Calculator
Get personalised results based on your own data.
Open Free Calculator →Frequently Asked Questions
Why does the NHS say 2,000 calories for women?▼
These are population average estimates for a moderately active adult of average size — not personalised recommendations. Actual needs vary by 30–40% based on body size, age, and activity level. A 55 kg sedentary woman may need 1,450 calories; a 75 kg active woman may need 2,300. Use a TDEE calculator for a personalised estimate.
Do calorie needs decrease with age?▼
Yes — resting metabolic rate decreases approximately 2–3% per decade after age 20, primarily due to muscle mass loss. A 60-year-old needs roughly 200–400 fewer calories than a 25-year-old of the same size and activity level. Maintaining muscle mass through resistance training mitigates this decline.
Is 1,200 calories too low?▼
For most adults, 1,200 calories is the minimum floor that can meet basic nutritional needs — not an ideal diet. Eating significantly below your TDEE increases muscle loss, slows metabolism, causes nutrient deficiency, and makes long-term adherence nearly impossible. A 300–500 calorie deficit below your TDEE is safer and more effective.
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⚕️ Medical Disclaimer: For informational purposes only. Not a substitute for professional medical advice. Always consult a qualified healthcare professional.
EC
Dr. Emma Clarke, PhD, RD
WellCalc Medical Contributor
All articles reviewed by qualified healthcare professionals following NHS, AHA, and WHO guidelines.