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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)
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Fiber Calculator
Daily fiber target from calorie intake.
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Hair Growth Calculator
How long it takes hair to reach a target length at a growth rate you choose.
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Healthy Weight Calculator
Weight range for a normal BMI at your height.
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Height Calculator
Convert height between centimeters and feet-and-inches.
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Ideal Weight Calculator
Healthy weight range for your height.
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Karvonen Formula Calculator
Target heart rate from heart-rate reserve and training intensity.
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Macro Calculator
Split daily calories into grams of carbohydrate, protein and fat.
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Max Heart Rate Calculator
Maximum heart rate and Karvonen training zones.
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Net Carb Calculator
Net carbohydrates after subtracting fiber and sugar alcohols.
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Ponderal Index Calculator
Weight relative to the cube of height.
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Protein Calculator
Daily protein target by body weight and activity.
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Push-Up Calorie Calculator
Calories burned doing push-ups (calisthenics) for a given effort level and time.
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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.