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Health & Wellness39

Explore estimates with their methods explained, or choose optional device tracking.

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Adult BMI CalculatorCalculate adult body mass index with independent kg/lb and cm/feet inputs.

BMR CalculatorCompare three adult resting-energy equations with clear assumptions.

TDEE CalculatorEstimate maintenance energy from resting expenditure and whole-day activity.

Calorie Needs CalculatorEstimate maintenance energy from resting expenditure and whole-day activity.

Body Fat CalculatorCompare a circumference estimate with a BMI-derived adult estimate.

Ideal Weight CalculatorCompare four historical reference-weight equations without setting a personal target.

Healthy Weight Range CalculatorFind the weight interval corresponding to the adult BMI reference band.

Lean Body Mass CalculatorEstimate adult fat-free body mass using the Janmahasatian equation.

Army Body Composition CalculatorCalculate waist-to-height ratio using the current 2026 Army approach.

Pace & Race Time CalculatorCalculate pace, speed, duration, distance or an illustrative race time.

Calories Burned CalculatorEstimate gross and net activity energy across 38 sourced activities.

One Rep Max CalculatorCompare seven estimates from a completed set of 1–10 repetitions.

Heart Rate Zones CalculatorCompare percentage-of-maximum and Karvonen reserve-based zones.

Macro CalculatorExplore calorie-to-gram splits using presets or your own percentages.

Carbohydrate CalculatorConvert adult energy-share reference intervals to grams for an entered energy level.

Fat Intake CalculatorConvert adult energy-share reference intervals to grams for an entered energy level.

Protein CalculatorCalculate the adult protein reference or an explicitly chosen g/kg factor.

GFR CalculatorEstimate adult kidney filtration using the race-free 2021 CKD-EPI creatinine equation.

Body Surface Area CalculatorCompare adult surface-area estimates in square metres.

Body Proportions CalculatorExplore measurement-based clothing proportions with a transparent shape convention.

BAC CalculatorIllustrate the limits of a simplified alcohol model. Never a driving or sobriety test.

Water Intake ReferenceSee the adult total-water reference, including beverages and food moisture.

Health Unit ConverterConvert weight, height, distance and temperature with explicit units.

Period CalculatorEstimate your next period and six upcoming starts from your own cycle interval.

Ovulation & Fertility CalculatorExplore an estimated ovulation date alongside a clearly labelled uncertainty interval.

Cycle Length CalculatorCalculate mean, median, shortest and longest intervals from recorded period starts.

Cycle & Follicular Phase CalculatorSee the entered cycle day and an educational follicular, ovulation and luteal phase model.

Irregular Cycle CalculatorSummarize your recorded variation and show a next-period interval without false precision.

Implantation Timing CalculatorView a research-based implantation interval without treating it as a pregnancy test.

Cycle Estimate After Pregnancy LossEstimate a later cycle only after a true menstrual period has resumed after a loss.

Fertility Awareness CalendarUnderstand the Standard Days calendar rule and why no dates are guaranteed pregnancy-safe.

Pregnancy CalculatorCalculate gestational weeks, due date and calendar milestones for a chosen observation date.

Due Date CalculatorEstimate a due date from a period, known ovulation, fertilization or reported ultrasound age.

IVF Due Date CalculatorConvert your clinic-recorded transfer date and embryo age into pregnancy dating.

Conception Timing CalculatorBack-calculate an approximate fertilization date from a pregnancy dating reference.

Pregnancy Weight Gain CalculatorCompare measured weight change with a singleton total-gain reference, without a weekly score.

Pregnancy Calorie ReferenceAdd the U.S. trimester energy reference to a pre-pregnancy maintenance amount you know.

Health & Cycle TrackerKeep a device-only calendar of periods, BBT, weight, water and workouts, with explicit opt-in.

BBT ChartLog waking temperatures in Celsius or Fahrenheit and review a chart with observation notes.

Image tools and everyday generators run in your browser. PDF exports use the server. Health calculators explain their sources and do not save your inputs; device tracking is a separate choice.