Prenatal & Postnatal Fitness

Estimate a due date and gestational age from a last menstrual period and 20–45 day cycle, with calendar-safe arithmetic and clear ultrasound-dating limits.

Estimate an LMP-based due date with usual-cycle adjustment and reproducible as-of gestational age, with clinical dating limits.

Calculate adult BMI from metric or imperial height and weight. See CDC screening categories, formula steps, and limitations without treating BMI as a diagnosis.

Compare adult BMR equations and a selected activity-multiplier TDEE scenario without generating calorie, macro, or meal prescriptions.

Convert a user-selected energy total and carbohydrate, protein, and fat percentages into calories and grams with adult AMDR context.

Free online baby budget calculator to estimate first-year costs for diapers, gear, medical care, and childcare. Plan newborn expenses before your baby arrives.

Allocate exactly 100% of monthly income, compare non-negative actual spending, expose fixed-dollar extras, and review transparent balances and planning ratios.

Free online diaper calculator to estimate how many diapers you need per month and yearly diaper costs by baby age. Compare disposable and cloth diaper budgets.

Apply entered in-network deductible, coinsurance, copays, and out-of-pocket maximum terms to an entered allowed-charge scenario, plus premiums.

Estimate adult body-fat percentage with a sex-specific U.S. Navy circumference equation, explicit measurement guidance, unit conversion, and non-diagnostic limitations.

Estimate adult basal metabolic rate with Mifflin–St Jeor, revised Harris–Benedict, or Katch–McArdle, plus a clearly labeled activity-multiplier TDEE scenario.

Calculate average pace per kilometer and mile plus speed from one entered distance and elapsed time. Transparent constant-pace arithmetic, not a race predictor.

Calculate a user-entered heart-rate-reserve percentage range with the Tanaka age-estimated maximum. Shows formula and limits; never prescribes training zones.

Reproduce mean kilometre/mile pace and speed from one completed source-owned race result and retained event distance, with an optional same-result displayed-pace comparison—without creating targets, splits, predictions or training advice.

Reconcile one completed conventional bicycle gear-pair record from whole tooth counts, measured loaded wheel rollout, and installed crank length.

Reconcile one completed bicycle cadence-speed interval from whole-tooth gearing, measured loaded rollout, recorded speed, and observed distance/time.

Reconcile pace per 100 for one completed, source-labelled swim distance and elapsed-time record without converting course performance or prescribing training.

Reproduce and reconcile the two-point critical swim speed calculation from one source-labelled completed 200 m and 400 m record without prescribing training.

Reconcile a source-labelled swim timing schedule, including every full checkpoint and any final remainder segment, without prescribing race or training pace.

Reconcile one completed adult swimming record with an exact 2024 Compendium code, standard-MET arithmetic, and an independent kcal estimate.

Reconcile a source-labelled latitude/longitude endpoint pair on WGS 84 or GRS 80 with an independent ellipsoidal distance without claiming a route, track, course or swim.

Reconcile one completed session-RPE load with its protocol, duration, global rating, source context, and independent same-record result.

Compare Devine, Robinson and Miller adult reference-weight formulas and a separate BMI screening interval without prescribing a target.

Compare adult beverage water with National Academies total-water Adequate Intake references while keeping food water and individual needs explicit.