Find Your BMI and Health Score in Seconds
Enter your height and weight in metric or imperial units to instantly see your Body Mass Index, weight category, and an estimated health score that factors in your exercise frequency.
Calculate BMI
BMI Calculator
Enter your height, weight, and exercise frequency to see your BMI, category, and health score instantly.
Gender
Unit System
Measurements
Exercise Frequency
3 days / weekEnter your measurements to see your BMI and health score
BMI is a general health indicator for adults. Consult a healthcare professional for personalized advice.
Metric and Imperial Support
Switch between metric (kg and cm) and imperial (lb and ft/in) with one click. The calculator automatically resets to realistic defaults for your selected gender and unit system so you can start adjusting from a sensible baseline.
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BMI and Health Score Charts
Results are displayed as two doughnut charts side by side. The BMI chart compares your value to the ideal midpoint (22). The health score chart shows a composite 0-100 score that accounts for both your BMI and how often you exercise each week.
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Exercise Frequency Slider
The health score is not just about BMI. Drag the slider from 0 to 7 days per week to reflect your actual exercise routine. More exercise days lift the composite score, rewarding active lifestyles regardless of current weight.
Try It NowGet your BMI in three steps
Choose your gender and unit system
Select male or female and pick metric (kg/cm) or imperial (lb/ft+in). The calculator pre-fills sensible default values so you can adjust from there.
Enter your height and weight
Type your values and drag the exercise frequency slider to match your weekly activity level. BMI and health score update automatically with every change.
Read your results
See your BMI value and category in the first chart, and your combined health score rating in the second. Use the Reset button to return to defaults.
Deep Dive
How BMI and the Health Score Work
BMI applies a simple formula to your height and weight. The health score extends this by factoring in exercise frequency to give a more complete picture.
What This Calculator Offers
Metric and Imperial
Switch units instantly; feet and inches split into separate fields for accuracy.
Live Charts
BMI and health score doughnut charts update automatically as you type.
Exercise Factor
A slider blends exercise frequency into the health score for a fuller picture.
Instant Category
WHO BMI category displayed clearly with every result.
Who Uses It
Who Uses This Calculator
Anyone curious about where their weight and BMI fall relative to health guidelines.
Frequently Asked Questions
What inputs does the calculator need?
You need your gender, preferred unit system (metric or imperial), weight, height, and an optional exercise frequency. The calculator pre-fills typical defaults for each gender so you can start from a realistic baseline and adjust.
What is considered a healthy BMI?
The WHO defines a healthy BMI as 18.5 to 24.9 for adults. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is classified as obese in three severity classes. The ideal midpoint used as the chart reference is 22.
Is BMI accurate for everyone?
BMI is a useful population-level screening tool but has known limitations for individuals. It cannot distinguish between muscle and fat, so athletes and heavily muscled people often score as overweight despite low body fat. It is also less accurate for older adults and may not align with body composition norms across all ethnic groups.
How is the health score calculated?
The health score starts at 100 and applies BMI-based penalties for values outside the healthy range, then adjusts for exercise frequency. Exercising more than 3.5 days per week adds points; exercising less subtracts them. The final value is clamped between 0 and 100 and rated from Very Poor to Excellent.
Can children use this calculator?
This calculator is designed for adults 18 and older. BMI for children and adolescents aged 2 to 19 uses age and sex-specific growth chart percentiles rather than fixed cutoffs, because body composition changes significantly during development.
What should I do if my BMI is outside the healthy range?
BMI is one of many health indicators. A reading outside the healthy range is a useful signal to pay closer attention to your overall lifestyle, but it should be interpreted alongside other factors such as diet, fitness level, and family history. A healthcare professional can provide a more complete assessment.
Ready to Check Your BMI?
Enter your measurements and exercise frequency to get your BMI, category, and health score in seconds.