BMR Calculator – Addition.site

Use this free, web‑based Basal Metabolic Rate (BMR) calculator to quickly estimate the number of calories your body burns at rest.
Simply enter your age, gender, weight (kg) and height (cm), then click “calculate”. The result – your daily resting calorie needs – appears in the read‑only field and is automatically rounded to the nearest whole number. It's quick and simple to use, and totally free.

The calculator applies the Mifflin‑St Jeor equation (the most widely used modern formula):

• Male: BMR = 10 × weight + 6.25 × height – 5 × age + 5
• Female: BMR = 10 × weight + 6.25 × height – 5 × age – 161

(Weight in kilograms, height in centimeters, age in years.)

Once you have your BMR, you can use it to:

• Plan weight‑loss or weight‑gain diets – combine BMR with your activity level to calculate Total Daily Energy Expenditure (TDEE).
• Track calorie deficits or surpluses for bodybuilding or fat‑loss programs.
• Set realistic fitness goals by understanding the baseline calories your body needs to function.
• Compare different body‑size scenarios (e.g., how changes in weight or height affect resting calories).

How to use the page

1. Enter your data in the input fields.
2. Click the “calculate” button.
3. The result is displayed in the read‑only field.
4. Click the field to copy the number to your clipboard.
5. Click the X button to share your result on X (formerly Twitter).

Why BMR matters

• BMR is the energy your body requires for basic functions such as breathing, circulation, and cell production.
• Knowing your BMR helps you create a calorie plan that supports your health goals without over‑ or under‑feeding.
• BMR is only the resting portion of your total energy needs; add an activity multiplier (sedentary, lightly active, active, very active) to estimate TDEE.

Tips for accurate results

• Use metric units (kg and cm) – the calculator is designed for these measurements.
• Double‑check your age, weight and height for precision.
• Remember that BMR is an estimate; individual variations (muscle mass, metabolism, illness) can affect true calorie needs.

About this tool

• Completely free and ad‑supported (Google Ads).
• Built with HTML, CSS, and vanilla JavaScript – works on all modern browsers and devices.
• Includes a handy copy‑to‑clipboard feature and a share‑on‑X button for quick social sharing.
• A small emoji toggle adds a playful touch to the interface.

Use the Addition.site BMR Calculator to get a clear, science‑based estimate of your resting calorie needs and start planning a healthier, more informed lifestyle today. Totally free to uise and share.