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Free Health Calculators
BMI Checks provides practical, browser-based calculators for common health estimates: BMI, BMR, daily calories, ideal weight, and body fat percentage. Each tool is designed for quick education and careful interpretation, not diagnosis.
When to use each calculator
Use these calculators when you want a starting point: a BMI category, an estimated resting metabolism, a calorie target, a formula-based reference weight, or a body fat estimate from tape measurements. For medical decisions, combine the result with context such as symptoms, waist circumference, lab results, medical history, and professional guidance.
BMI Calculator
Calculate Body Mass Index using metric or US units. See your adult BMI category and an estimated healthy weight range for your height.
Ideal Weight Calculator
Estimate reference weights using the Devine, Robinson, and Miller formulas. Results are shown for all three formulas plus an average.
BMR Calculator
Estimate Basal Metabolic Rate and total daily energy expenditure using the Mifflin-St Jeor equation and an activity multiplier.
Calorie Calculator
Estimate daily calorie needs for maintenance, gradual loss, or gain. Results are based on BMR, activity level, and goal.
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method. It uses height, neck, waist, and hip measurements when needed.
Calculator comparison
| Tool | Best for | Inputs | Use responsibly |
|---|---|---|---|
| BMI Calculator | Adult weight category screening | Body weight, Metric and US units, Adult screening | Does not measure body fat directly. |
| Ideal Weight Calculator | Formula-based reference weights | Ideal weight, 3 formulas, Height and gender | Not a required target weight. |
| BMR Calculator | Resting calorie needs and TDEE | Basal metabolic rate, TDEE, Mifflin-St Jeor | Activity multipliers are estimates. |
| Calorie Calculator | Maintenance, loss, or gain targets | Daily calories, Weight goals, Activity level | Avoid extreme deficits without professional advice. |
| Body Fat Calculator | Circumference-based body composition estimate | Body fat percent, US Navy method, Tape measure | Measurement technique affects the result. |
Which calculator should I use?
Start with the BMI Calculator if you want a quick adult screening category. Use the BMR Calculator when you want resting energy needs, then the Calorie Calculator when you want a daily calorie estimate based on activity and goal. Use Ideal Weight and Body Fat calculators for extra context, not as final answers.
Privacy and local calculations
Calculator inputs are processed in your browser. BMI Checks does not require an account and does not ask for your name. If a tool offers local saving, that data stays on your own device unless you choose to share it.
Responsible use
All calculators on BMI Checks use standard, widely published formulas from public health guidance or peer-reviewed research. Results are estimates based on population averages. They can help you ask better questions, but they cannot assess your complete health, diagnose a condition, or replace advice from a qualified healthcare professional.
Health calculator FAQ
Are these calculators medical tools?
No. They are educational estimates and screening tools. They do not diagnose health conditions or replace professional medical advice.
Do you store calculator inputs?
No account is required and calculations are processed in your browser. BMI Checks does not need to send your measurements to a server to calculate results.
Which calculator should I start with?
Start with BMI for a quick adult screening category, then use BMR and calorie calculators if you want energy estimates.
Can I use these tools while pregnant?
Pregnancy changes weight and body composition. Use standard adult calculators cautiously and ask a qualified healthcare professional for personal guidance.
Can children use these calculators?
Adult BMI categories and several formulas are not designed for children. Pediatric interpretation usually requires age- and sex-specific tools.
Health disclaimer
All tools on this site are for general informational purposes only and do not replace professional medical advice. Always consult a qualified healthcare provider for personal health concerns.