All Health Calculators & Trackers

Calculate adult BMI from height and weight, show the CDC adult category, and explain why BMI is a screening measure rather than a diagnosis.

Calculate BMI-for-age for ages 2–19 using CDC sex-specific growth-chart data and report percentile/category without applying adult thresholds.

Estimate the adult body-weight range corresponding to BMI 18.5–24.9 for a supplied height.

Compare Devine, Robinson, Miller and Hamwi reference-weight formulas rather than presenting one “perfect” weight.

Estimate adult body-fat percentage with the Deurenberg BMI-age-sex model and show its uncertainty and limitations.

Run Step 1 of the current U.S. Navy body-composition assessment using waist-to-height ratio, then see whether the official Step 2 lookup is required.

Calculate the current U.S. Army waist-to-height ratio standard from waist at the navel and height, to three decimal places.

Compare established lean-body-mass equations and show estimated fat-free mass in kilograms and pounds.

Calculate fat-free mass index and height-normalized FFMI from height, weight and body-fat percentage.

Calculate a reference adjusted body weight for educational comparison only, never for medication dosing.

Calculate Body Adiposity Index from hip circumference and height and explain the model’s population limitations.

Estimate Relative Fat Mass from height, waist circumference and sex using the published RFM equation.

Calculate waist-to-hip ratio and provide neutral, source-controlled context without turning the ratio into a diagnosis.

Calculate waist-to-height ratio as a simple anthropometric ratio and keep military thresholds separate from general health context.

Calculate Body Roundness Index from waist circumference and height with the published BRI equation.

Calculate Ponderal Index from mass and height cubed and explain how it differs mathematically from BMI.

Calculate a height-to-wrist ratio and show legacy frame-size categories only as a non-clinical heuristic.

Estimate total body water with the Watson equations and show liters plus percentage of body weight.

Calculate absolute and percentage weight change from starting and current weight with neutral gain/loss wording.

Track weight privately on this device with dated entries, local trends, export and explicit delete-all controls.

Estimate adult BMR and maintenance calories from age, sex, height, weight and activity level using a named formula and transparent activity multipliers.

Estimate basal/resting energy with Mifflin-St Jeor and optionally compare established equations.

Estimate resting energy needs and explain the practical distinction between RMR and BMR.

Estimate total daily energy expenditure from BMR and a clearly described activity multiplier.

Estimate maintenance calories from a known TDEE or profile and show the activity assumptions used.

Calculate a target daily intake from TDEE and a user-selected calorie deficit, with conservative adult-only warnings.

Estimate a calorie target and arithmetic timeline from current weight, goal weight and a chosen deficit without guaranteeing an outcome.

Estimate a calorie target and arithmetic timeline from current weight, goal weight and a chosen surplus without promising lean-mass gain.

Convert daily calories and macro percentages into protein, carbohydrate and fat grams with sum validation.

Estimate a general protein range from body weight and activity/goal assumptions without disease-specific advice.

Convert calories and carbohydrate percentage to grams, or grams back to calories and percentage.

Convert calories and fat percentage to grams, or fat grams back to calories and percentage.

Show a general daily fiber reference using age/sex or calorie-based guidance with the source scope stated.

Estimate a general total-water reference and distinguish total water from beverages-only intake.

Track drinks privately on this device against a user-defined daily goal with local history and export.

Estimate daily energy requirement using the current National Academies 2023 EER framework and show the equation/version used.

Look up supported dietary reference intakes by age, sex and life stage and label each value as RDA, AI or other DRI type.

Estimate resting energy expenditure with the revised Harris-Benedict equation and show the formula used.

Estimate resting energy expenditure with the Mifflin-St Jeor equation and show the calculation inputs.

Estimate BMR from lean body mass using the Katch-McArdle equation and show sensitivity to body-fat input.

Estimate net carbohydrates from total carbs, fiber, erythritol and other sugar alcohols with the subtraction assumptions visible.

Convert a daily calorie intake into a reference added-sugar cap in calories and grams.

Calculate meal energy from protein, carbohydrate, fat and optional alcohol grams without relying on a food database.

Count steps during an active browser session using motion permission when supported, with a manual fallback and no background-counting claim.

Convert steps to miles using a measured stride when available or a clearly labelled height-based estimate.

Convert steps to kilometres using a measured stride when available or a clearly labelled height-based estimate.

Estimate steps from miles and stride length using the same conversion engine as the step-distance tools.

Estimate steps from kilometres and stride length using the same conversion engine as the step-distance tools.

Estimate walking distance and calories from steps, weight and stride assumptions, with the method shown.

Calculate stride length from measured distance and steps, with an optional height-based estimate as a fallback.

Estimate walking calories from weight, duration and pace/intensity using a named MET value.

Calculate walking pace per kilometre and mile plus speed from distance and elapsed time.

Estimate walking time from distance and pace or speed using exact unit conversions.

Calculate walking speed in km/h and mph plus pace from distance and time.

Calculate walking distance from steps and stride or from speed and time, with the method clearly labelled.

Estimate calories, calories per minute and MET-hours from MET value, body weight and activity duration.

Estimate activity calories from a selected MET, body weight and duration with the MET value and uncertainty visible.

Estimate running calories from weight, distance/duration and pace or speed assumptions.

Estimate cycling calories from body weight, duration and selected speed/intensity MET.

Estimate swimming calories from body weight, duration and selected stroke/intensity MET.

Estimate hiking calories from body weight, duration and hiking intensity, with optional sourced modifiers kept conservative.

Estimate resistance-training calories from body weight, duration and intensity while avoiding false precision.

Calculate running pace per kilometre and mile, speed and common-distance equivalents from distance and elapsed time.

Predict an equivalent race time with the Riegel equation and warn when extrapolation distances are far apart.

Build even, negative or positive split tables from race distance, finish time and split interval.

Estimate training-pace ranges from a recent race performance using a named preset methodology, not a medical prescription.

Estimate VO₂ max with a named field-test method such as Cooper 12-minute or 1.5-mile and show the method-specific assumptions.

Compare age-predicted maximum heart-rate equations and explain individual variability.

Calculate a target heart-rate range using percent of max HR or heart-rate reserve/Karvonen mode.

Build a five-zone heart-rate table using percent of max HR or heart-rate reserve.

Estimate a Zone 2 heart-rate range and explain why different methods can produce different ranges.

Estimate one-repetition maximum from lifted weight and reps using Epley, Brzycki and other established formulas.

Estimate the next period date from recent cycle lengths or the last start date, showing uncertainty rather than a single guaranteed date.

Store observed period dates locally, derive cycle statistics and forecasts on-device, and keep estimates visually separate from observations.

Calculate cycle day from the last period start date and a target/current date using date-only arithmetic.

Calculate individual cycle lengths, average, median and variability from at least two period-start dates.

Show observed and estimated cycle dates in a private local calendar with different visual treatment.

Estimate ovulation from the expected next period minus an editable luteal-phase assumption and show the assumption used.

Estimate a broad fertile window around ovulation and explicitly state that the result is not contraception.

Calculate luteal-phase length from an observed/estimated ovulation date and next period start.

Estimate an earliest/recommended pregnancy-test window from expected period or ovulation timing and defer to test instructions.

Show a broad estimated implantation window from ovulation/conception timing and emphasize uncertainty.

Estimate conception date or range from LMP, due date or ovulation and clearly label the chosen method.

Calculate gestational age, trimester, estimated due date, progress and countdown from LMP or due date using date-only arithmetic.

Estimate due date from LMP, cycle length, conception or IVF-related timing and explain the ultrasound-dating caveat.

Calculate current pregnancy week and day from LMP or due date and show the estimated due date.

Calculate gestational age in completed weeks and days from LMP or due date and show the calculation basis.

Map gestational weeks to a reference month range without pretending pregnancy months all have equal week counts.

Map gestational age to a clearly stated trimester convention and show weeks and days.

Keep a local pregnancy profile and show week, trimester, countdown and informational milestones without cloud sync.

Show CDC/National Academies reference weight-gain ranges based on pre-pregnancy BMI and singleton/twin pregnancy.

Estimate due date from embryo transfer or egg retrieval/fertilization date and show the embryo-age method used.

Calculate days and weeks until an estimated due date, or days past it, without treating the date as a guarantee.

Plan a sleep window from desired bedtime/wake time and duration, with optional approximate cycle visualization.

Calculate a bedtime from desired wake time, sleep duration and optional sleep-onset buffer.

Calculate a wake-up time from bedtime, desired sleep duration and optional sleep-onset buffer.

Show approximate cycle-aligned candidate bed/wake times without implying that every sleep cycle lasts exactly 90 minutes.

Calculate sleep duration between start and wake times, including overnight rollover.

Calculate daily and cumulative sleep debt or surplus from actual and target sleep duration; optional saving is local-only.

Plan practical nap durations and end times with context, without claiming one nap length is medically optimal for everyone.

Convert food Calories (kcal), kilojoules, small calories and joules with the exact thermochemical energy conversion and clear food-label terminology.