Use this calculator to estimate resting calorie needs before exercise and activity are added.
Inputs
This topic also has a deeper guide and a printable reference pack, so you can move from the live answer into the method, assumptions, and worked examples without leaving the topic cluster.
A deeper guide to BMI, BMR, ideal body weight, and formula-based baseline metrics, written as a responsible planning reference rather than a diagnostic tool.
A fuller guide to intake planning, covering hydration, macro splits, and calorie-burn style estimates in a careful, formula-based way that stays useful without pretending to be medical advice.
These are the main values the calculator uses. Keep the units consistent and, where relevant, match the assumptions explained in the related guide.
Choose the formula variant used by the Mifflin-St Jeor BMR equation.
Unit: years
Enter age in years for the BMR estimate.
Choose metric or imperial entry for height and weight.
Unit: kg
Enter body weight in kilograms.
Unit: cm
Enter height in centimetres.
Unit: lb
Enter body weight in pounds.
Use this page when you want a starting estimate of resting energy needs based on age, sex, height, and weight.
The main result is estimated basal metabolic rate in kcal per day. Supporting values show the measurements used in the formula.
A 30-year-old woman who is 170 cm tall and weighs 70 kg has an estimated BMR of about 1,451.5 kcal per day under the Mifflin-St Jeor equation.
BMR is an estimate built from a population-level equation. Real energy needs vary with health status, body composition, and activity.
No. BMR estimates resting needs only. Daily calorie needs are usually higher once movement, exercise, and digestion are included.
Turn a calorie target and chosen percentage split into daily protein, carbohydrate, and fat goals.
Use the Calorie Burn Calculator as a general planning estimate with clear assumptions and careful interpretation.
Estimate a daily hydration target from body weight, activity, and climate using a cautious planning-oriented approach.
Estimate body mass index from height and weight using metric or imperial inputs, with screening-focused interpretation rather than medical claims.