Health & Fitness Tools
Body metrics, energy balance, hydration and pace calculators using published formulas, with the assumptions stated openly.
Built for runners, gym-goers, general public. 22 tools published.
A1C to eAG
Apply the published ADAG relationship to A1C reported as a percentage.
🏃Absolute Neutrophil Count
Combine total white blood cells with neutrophil and band percentages from one CBC.
🏃BMI Calculator
Your BMI, your category, the healthy weight range for your height — and an honest account of the four situations where BMI gives the wrong answer about you.
🏃Body Fat (Navy)
A 2 cm slip on the waist moves the answer by more than a point, so a single decimal is false precision. This shows the range and where the formula breaks.
🏃Body Surface Area
They agree closely on an average build and diverge at the extremes, because most were fitted on small samples of average people.
🏃BUN/Creatinine Ratio
Divide BUN by serum creatinine when both are reported in mg/dL.
🏃Calculated Osmolality
Apply the common mg/dL equation to values from the same blood specimen.
🏃Child BMI Change
Subtract two BMI values while preserving the visit dates and growth-chart context.
🏃Child BMI Value
Calculate kg/m² while keeping percentile interpretation outside the arithmetic.
🏃Child Dose Adherence
Compare logged doses taken with doses scheduled on the prescription label.
🏃Child Fluid Goal
Turn recorded intake into completion of a goal supplied by the care team.
🏃Child Height Velocity
Convert two standing-height measurements into centimeters per year.
🏃Child Medicine Supply
Divide dispensed volume by the exact label-directed daily volume.
🏃Child Sleep Opportunity
Measure the clock interval from bedtime to wake time, including an overnight crossing.
🏃Corrected Anion Gap
Apply an editable albumin adjustment to an already calculated anion gap.
🏃Corrected Calcium
Apply the conventional editable albumin correction to total calcium in mg/dL.
🏃Growth Age in Months
Combine completed years and months into one growth-chart age value.
🏃Growth Percentile Change
Record movement between two clinician- or chart-reported percentiles.
🏃Medication Adherence
Compare doses logged as taken with doses prescribed for the same period.
🏃TDEE Calculator
Mifflin-St Jeor BMR with activity levels described by what your week actually looks like, not by adjectives. Includes a deficit planner and the error range stated openly.
🏃Waist to Height Ratio
Keep your waist under half your height. One measurement, one division, and in most published comparisons a better predictor of risk than BMI.
🏃Waist-to-Hip Ratio
It is a ratio, so large hips hide a large waist. And one centimetre of tape placement moves the result by 0.01 — a category is only about 0.05 wide.