Perform fast calculations with our user-friendly online calculator! Conveniently crunch numbers and solve equations instantly. Ideal for quick math tasks, our tool simplifies your daily computations effortlessly. Try our intuitive calculator for accurate results on the go!
Calculate your Resting Metabolic Rate with our easy online RMR calculator. Use age, sex, height, and weight to estimate daily calories at rest.
A Resting Metabolic Rate calculator helps you estimate how many calories your body needs at rest. It uses your age, sex, height, and weight to estimate your daily resting calorie burn.
Our online Resting Metabolic Rate calculator uses the Mifflin-St Jeor equation. This is a widely used formula for estimating resting energy needs. The result is shown in calories per day.
You can use this calculator for weight planning, calorie tracking, fitness goals, and nutrition planning. It can also help you understand your RMR, resting calories, daily calorie needs, and energy expenditure.
Resting Metabolic Rate (RMR) is the energy your body uses while at rest. Your body needs this energy for basic functions. These include breathing, blood flow, brain function, and keeping your body warm.
RMR is not the same as your total daily calorie needs. Your total needs also include movement, exercise, digestion, and daily activity.
This calculator uses the Mifflin-St Jeor formula.
For men:
RMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
For women:
RMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Here, weight is in kilograms, height is in centimeters, and age is in years.
| Input | Unit |
|---|---|
| Weight | kg |
| Height | cm |
| Age | years |
| Result | kcal/day |
If you enter pounds, the calculator converts pounds to kilograms. If you enter inches or feet and inches, it converts height to centimeters before applying the formula.
Suppose a woman is 30 years old. Her weight is 65 kg, and her height is 165 cm.
First, use the female RMR formula:
RMR = (10 × 65) + (6.25 × 165) − (5 × 30) − 161
Now calculate each part:
10 × 65 = 650
6.25 × 165 = 1,031.25
5 × 30 = 150
Now combine the values:
RMR = 650 + 1,031.25 − 150 − 161
RMR = 1,370.25 kcal/day
So, the estimated Resting Metabolic Rate is 1,370.25 calories per day.
This means her body may use about 1,370 calories each day for basic functions while at rest. Her actual daily calorie needs will be higher once normal activity and exercise are included.
RMR and Basal Metabolic Rate (BMR) are closely related terms. Both estimate the energy your body needs for basic functions.
However, the testing conditions differ. BMR uses stricter conditions, such as a longer fast and controlled rest. RMR is measured under less strict conditions.
For everyday calorie planning, an RMR estimate can be useful. It gives a practical starting point for understanding resting calorie needs.
Knowing your RMR can help you understand your body's basic energy needs. It can support calorie planning and weight management.
For example, people often use RMR as a starting value when estimating Total Daily Energy Expenditure (TDEE). TDEE includes RMR plus physical activity, exercise, and other energy use.
RMR can also help when setting a calorie target for a fitness or nutrition plan. Still, calorie needs vary from person to person.
A Resting Metabolic Rate calculator gives a quick estimate of the calories your body needs at rest. Our calculator uses the Mifflin-St Jeor equation and supports common weight and height units.
Enter your sex, age, weight, and height. The calculator converts the units when needed. It then gives your estimated RMR in kcal/day.
Remember that RMR is an estimate. It isn't a direct measurement of your metabolism. For a measured result, indirect calorimetry performed under proper conditions is more precise.
A Resting Metabolic Rate calculator estimates how many calories your body uses at rest each day. It uses factors such as age, sex, height, and weight.
This calculator uses the Mifflin-St Jeor equation. It has separate formulas for men and women.
RMR means Resting Metabolic Rate. It is the estimated energy your body uses while resting to support basic body functions.
No. RMR and BMR are similar, but they use different testing conditions. RMR is generally measured under less strict conditions.
Yes. RMR is commonly reported as kilocalories per day (kcal/day).
No. RMR represents energy used at rest. Exercise and daily movement are part of your wider energy needs.
RMR can be a useful starting point for calorie planning. However, weight goals should also consider activity, food intake, health, and individual needs.
No prediction equation can give a 100% accurate result for every person. The calculator provides an estimate. Direct measurement with indirect calorimetry can provide a more precise RMR.
You need your sex, age, weight, and height. The calculator converts pounds to kilograms and inches or feet and inches to centimeters when needed.
There is no single “good” RMR for everyone. RMR varies with body size, age, sex, and other factors. A higher or lower value isn't automatically better.