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BMI Calculator
Find your Body Mass Index (BMI) and weight status.
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Free health calculators for everyday questions, from quick checks to detailed breakdowns.
Featured calculators
Health tools (35)
- Tested
BMI Calculator
Find your Body Mass Index (BMI) and weight status.
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Ape Index Calculator
Arm span compared with height.
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BMR Calculator
Estimate basal metabolic rate.
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Body Fat Calculator (U.S. Navy)
Estimate body fat percentage from tape measurements (U.S. Navy method).
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Calorie Calculator
Daily calorie needs by goal.
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Calorie Density Calculator
Calories per gram of a food.
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Calories Burned Calculator
Estimate calories burned from activity, body weight and time using MET values.
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Calories Burned Hiking Calculator
Calories burned hiking for a given body weight, pace and time.
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Calories Burned Standing Calculator
Calories burned while standing, from Compendium MET values.
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Carbohydrate Calculator
Daily carbohydrate range from calorie intake.
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Fat Intake Calculator
Daily fat range from calorie intake.
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FFMI Calculator
Fat-free mass index and its height-normalized value.
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All health calculators by topic (35)
Body Composition
Body Metrics
Exercise
Nutrition
Personal care
Weight Management
Weights
About health calculators
Health Calculators help you turn a question into a clear, checkable answer. Each tool lists its inputs, shows the formula it relies on and explains how to read the result.
Browse by topic using the filters, or search for a specific tool. Tools that are still being built are clearly marked as previews and are not presented as finished calculators.
Frequently asked questions
Are the health calculators calculators free?
Yes. Every calculator on Calculator Atlas is free to use and requires no sign-up.
How are results verified?
A calculator is only published after its formula has been implemented, tested against independently computed reference values. It is an automated check, not a professional review.