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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
TDEE Calculator
Total daily energy expenditure.
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Training Load Calculator
Session load from perceived exertion and duration.
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VO2 Max Estimate Calculator
Estimate VO2 max from a 12-minute run or from heart rates.
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Waist-to-Height Ratio Calculator
Waist-to-height ratio.
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Waist-to-Hip Ratio Calculator
Waist-to-hip ratio and WHO risk threshold.
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Water Intake Calculator
Daily hydration estimate.
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Water Weight Calculator
Weight of a volume of water at a given temperature.
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Weight Change Rate Calculator
Average weight change per week and as a share of starting weight.
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Weight Gain Calculator
Daily calorie surplus for a target weekly weight gain.
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Weight Loss Percentage Calculator
Percentage of starting weight lost.
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Workout Volume Calculator
Total lifted volume from sets, reps and weight.
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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.