FREE CALCULATOR
Resting Energy Expenditure Calculator
Estimate the calories your body uses at rest based on your age, sex, weight, and height.
Your Estimated REE
0 kcal
calories per day at rest
Age
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Weight
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Height
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Resting Energy Expenditure is an estimate of the energy your body uses
to maintain basic physiological functions while resting.
Practical Uses of Resting Energy Estimates
Knowing your baseline energy requirement provides several practical advantages for health management:
- Establishes a Safe Caloric Floor: Helps prevent severe undereating by showing the minimum energy required to keep vital biological systems running properly.
- Optimizes Macronutrient Distribution: Provides a stable baseline for calculating daily protein, carbohydrate, and fat targets tailored to your true metabolic rate.
- Informs Weight Loss Strategies: Allows you to design moderate, sustainable calorie deficits that reduce fat while preserving muscle mass and energy levels.
- Supports Muscle Building Protocols: Ensures you eat enough above your resting requirement to fuel muscle protein synthesis and post-workout recovery.
Understanding Your Calculated Resting Energy Expenditure
The output provided by a Resting Energy Expenditure Calculator represents an accurate mathematical estimate based on average biological data. It serves as your primary baseline, showing what your body burns before considering daily steps, chores, or exercise.
To make practical use of your result:
- Do not eat below your REE: Consistently consuming fewer calories than your resting energy requirement can lead to muscle loss, nutrient deficiencies, and fatigue.
- Apply an activity factor: Multiply your REE by an appropriate activity level to find your maintenance calorie budget.
- Track real-world results: Monitor your body weight and energy levels over 2 to 3 weeks. If your weight remains steady while eating at your calculated maintenance level, your REE baseline is accurate. Adjust intake slightly if scale trends move faster or slower than expected.