Health Calculator | BMI, BMR, Calories, Water, and Heart Rate

Health

Health and BMI Calculator

Estimate BMI, basal metabolic rate, daily calories, water intake, and exercise target heart-rate ranges.

BMI calculator

Enter height and weight to calculate BMI and Korean BMI category.

Height (cm) Weight (kg)

Enter values to calculate. BMI = weight (kg) ÷ height (m)²

underweight below 18.5

normal 18.5 to below 23

pre-obesity 23 to below 25

class 1 obesity 25 to below 30

class 2 obesity 30 to below 35

class 3 obesity 35 or higher

BMR calculator

Estimate daily basal metabolic rate from sex, age, height, and weight.

Sex Age Height (cm) Weight (kg)

Enter values to calculate. Mifflin-St Jeor equation

Target heart rate calculator

Calculate your exercise heart-rate range from age and workout intensity.

Age Exercise intensity

Enter values to calculate. Maximum heart rate ≈ 220 - age

Daily calorie calculator

Estimate maintenance calories and goal calories from BMR and activity level.

Sex Age Height (cm) Weight (kg) Activity level Goal

Enter values to calculate. BMR × activity factor = maintenance calories

Water intake calculator

Estimate daily water intake from weight, exercise time, and warm conditions.

Weight (kg) Exercise time (min) Environment

Enter values to calculate. weight × 30ml + activity adjustment

When to use this calculator

Estimate BMI, basal metabolic rate, daily calories, water intake, and exercise target heart-rate ranges.

Reviewing a general weight category
Planning a rough calorie or hydration target
Choosing an exercise heart-rate range

Worked examples

BMI

At 170 cm and 70 kg, BMI is about 24.2.

BMR

The calculator uses the Mifflin-St Jeor equation.

Target heart rate

The range is estimated from maximum heart rate and exercise intensity.

Frequently asked questions

Is BMI a diagnosis?

No. BMI is a screening indicator and does not measure body composition or diagnose disease.

Are calorie estimates exact?

No. Actual energy needs vary by metabolism, activity, and health status.

Does water intake include food?

The estimate focuses on drinks and notes that food and other beverages also contribute water.

How to interpret the result

The BMI categories shown follow commonly used Korean adult ranges and can differ from international cutoffs.

Consult a qualified professional for symptoms, treatment, pregnancy, chronic disease, or a medically prescribed diet.