Estimated Energy Requirement (EER) Calculator
The EER calculator (Estimated Energy Requirement calculator) estimates the average dietary energy intake needed to maintain energy balance in healthy, normal-weight individuals. Similar to TDEE calculations and the maintenance calorie calculator, this tool tells you how many calories you can eat each day to maintain your current weight.
What Is Estimated Energy Requirement?
Estimated Energy Requirement (EER) is the average energy intake needed to maintain the current weight of an individual. Its value depends on:
- Age — energy needs change throughout life;
- Sex — males and females have different metabolic rates;
- Weight — heavier individuals require more energy;
- Height — taller individuals have a larger body surface area;
- Level of physical activity — more active people burn more calories;
- Physiological state (e.g., pregnancy, lactation, illness) — not covered by this calculator.
EER Formula
The EER calculator uses formulas developed by the Institute of Medicine:
For Males:
For Females:
Where:
- EER — estimated energy requirement (kcal/day);
- A — age in years;
- W — weight in kilograms;
- H — height in meters;
- PA — physical activity coefficient.
Physical Activity (PA) Coefficients
| Activity Level | Description | Male PA | Female PA |
|---|---|---|---|
| Sedentary | Little or no exercise, desk job | 1.00 | 1.00 |
| Low Active | Light exercise, walking, 1–3 days/week | 1.11 | 1.12 |
| Active | Moderate exercise 3–5 days/week | 1.25 | 1.27 |
| Very Active | Hard exercise 6–7 days/week or physical job | 1.48 | 1.45 |
How to Calculate EER — Example
Let's calculate EER for John, a 40-year-old male who wants to maintain his weight. He weighs 70 kg, is 172 cm tall, and describes his activity level as "Low Active" (office job, enjoys walking, visits the gym occasionally).
Using the male EER formula:
EER = 662 − 381.2 + 1.11 × [1113.7 + 928.1]
EER = 280.8 + 1.11 × 2041.8
EER = 280.8 + 2266.4
EER ≈ 2,547 kcal/day
John needs to eat approximately 2,547 calories per day to maintain his current weight.
Don't worry if you prefer pounds and inches — our EER calculator has built-in unit converters that switch between metric and imperial units automatically. Just select your preferred unit system!
EER Nutrition: Macronutrient Distribution
Once you know your EER, how calories are distributed across macronutrients becomes equally important. According to USDA Dietary Guidelines, a healthy diet should have the following macronutrient distribution:
| Macronutrient | % of Daily Energy | Calories per gram |
|---|---|---|
| Protein | 10–35% | 4 kcal/g |
| Carbohydrates | 45–65% | 4 kcal/g |
| Fat | 20–35% | 9 kcal/g |
Following these recommendations may not only help you maintain your weight but also protect you from diabetes and cardiovascular disease.
Frequently Asked Questions
What is the difference between EER and TDEE?
EER (Estimated Energy Requirement) uses the Institute of Medicine formulas designed specifically for healthy, normal-weight individuals to estimate the average energy needed for weight maintenance. TDEE (Total Daily Energy Expenditure) typically uses the Mifflin-St Jeor equation and can account for a wider range of body compositions. For most healthy people, the results are similar.
Can I use EER if I want to lose or gain weight?
The EER is your maintenance calorie baseline. To lose weight, consume fewer calories than your EER (typically a 500 kcal/day deficit). To gain weight, consume more (typically a 300–500 kcal/day surplus). Check our calorie deficit calculator and weight gain calculator for detailed plans.
Does EER account for pregnancy or illness?
No. The standard EER formulas are for healthy, non-pregnant, non-lactating adults. Pregnancy, lactation, illness, and recovery require additional energy — consult a healthcare professional for personalized needs.
How accurate is the EER formula?
The EER formula provides a population-level average estimate. Individual metabolic rates can vary by ±10–20% depending on genetics, muscle mass, and health conditions. Use the result as a starting point and adjust based on real-world observations of your weight over 2–4 weeks.
Does age affect EER significantly?
Yes. Metabolic rate tends to decrease with age due to muscle loss (sarcopenia). The formula accounts for this through the age coefficient (−9.53 × A for males, −6.91 × A for females). Regular strength training can help preserve muscle mass and maintain a higher EER with age.