What is Estimated Energy Requirement (EER)?
Estimated Energy Requirement is the number of calories your body needs each day to maintain your current body weight, based on age, sex, body size, and activity level. Think of it as a maintenance target rather than a strict rule. Your real-world needs can shift with sleep quality, stress, health conditions, and training intensity.
A good EER estimate gives you a practical starting point for nutrition planning. If your goal is weight maintenance, you can eat near this value. If your goal is fat loss or weight gain, you can adjust from this baseline in small, sustainable steps.
How this calculator estimates your daily calories
This tool uses standard adult equations from nutrition science references. The formula combines:
- Age (metabolic needs generally decline with age)
- Sex (male and female equations are different)
- Body weight and height (larger body size usually means greater energy needs)
- Physical activity level (the strongest driver outside body size)
The result is your estimated maintenance energy intake in calories (kcal/day) and kilojoules (kJ/day).
Activity level guide
Sedentary
Mostly sitting during the day with minimal intentional exercise.
Low active
Daily life includes light movement, walking, and occasional exercise.
Active
Consistent moderate exercise or physically active routines on most days.
Very active
High training volume, physically demanding work, or both.
How to use your result in real life
- Maintenance: Start near your EER and monitor body weight trends for 2–3 weeks.
- Fat loss: Reduce by about 250–500 kcal/day, depending on your size and activity.
- Weight gain: Increase by about 200–350 kcal/day and adjust gradually.
- Performance: Keep intake near or slightly above EER during heavy training blocks.
The best approach is to make small changes, track progress, and adjust based on outcomes rather than aiming for perfect precision on day one.
Important notes and limitations
- This is an estimate, not a diagnosis or medical prescription.
- Hydration, medications, hormonal factors, and illness can change calorie needs.
- Pregnancy, lactation, or growth phases require special considerations.
- Athletes with very high output may need more individualized planning.
If you have a medical condition, are recovering from illness, or need therapeutic nutrition planning, consult a registered dietitian or qualified clinician.
Quick FAQ
Is EER the same as BMR?
No. Basal Metabolic Rate (BMR) is the energy your body uses at complete rest. EER includes activity and therefore is usually much higher than BMR.
Why might my weight still change at my estimated calories?
Because every formula has error. Also, activity and intake are often inconsistent week to week. Track averages, not single days.
How often should I recalculate?
Recalculate after meaningful changes in body weight, activity level, or training schedule.