Health

Q: Why do some calculators ask for more fields now?

Because more context can improve calculation personalization. Weight, activity, body composition and resting heart rate help reduce oversimplification.

Q: Are health inputs sent to analytics?

No. Project policy is not to send sensitive values such as age, weight, circumferences or health results to analytics.

Educational health, nutrition and body-composition calculators with estimates, sources and clear medical disclaimers.

Tools: 19
Updated: July 26, 2026

19 of 19 tools

BMI CalculatorCalculate adult BMI with classification and explicit limitations.
BMR CalculatorEstimate basal metabolic rate using the Mifflin-St Jeor equation.
TDEE CalculatorEstimate daily energy expenditure from BMR and activity.
Child and Teen BMI CalculatorCalculate BMI-for-age percentile using CDC references for people ages 2–19.
Macro CalculatorSplit calories into protein, carbohydrates and fat using AMDR ranges.
Daily Water Intake CalculatorEstimate total daily water intake by age, sex, pregnancy, lactation and context.
Ideal Weight CalculatorCompare historical adult reference-weight formulas.
Target Heart Rate CalculatorCalculate moderate and vigorous training zones by age, with Karvonen option.
Body Fat CalculatorEstimate body fat percentage from circumferences with explicit limitations.
Due Date CalculatorEstimated due date by Naegele's Rule, with trimester, gestational progress and pregnancy milestones.
Gestational Weeks CalculatorExact gestational weeks and days from LMP, with current trimester and estimated due date.
Fertile Window CalculatorEstimated ovulation date, fertile window and cycle calendar — with irregular cycle guidance and clear disclaimers.
Gestational Age by UltrasoundEstimates gestational age from biometric measurements (CRL, BPD, HC, AC, FL) — ideal when LMP is uncertain.
Calories Burned by Activity CalculatorNewEstimate calories burned in each physical activity with the MET method.
Chinese Gender PredictorNewTraditional Chinese baby gender prediction chart. Entertainment folklore, with no proven medical basis.
Child Growth Chart (0-24 Months)NewWeight, length and head-circumference percentile and z-score for 0-24 months, using the official WHO growth curves.
Dog & Cat Pregnancy CalculatorNewEstimated due date, expected range and a milestone timeline, from the mating date.
Running Pace CalculatorNewPace, time or distance, km/mile splits and race-to-race equivalence using the Riegel formula.
Decibel MeterNewSound level meter with A, C and Z weighting, slow and fast response, Leq, and a check against Brazil's NR-15 limits.

Health calculators with an educational focus and more context

The health category brings together common calculators with context, sources and important warnings. Beyond the result, each page explains what the calculation measures and what its limits are.

That includes BMI, child BMI, BMR, TDEE, daily water, macros, ideal weight, target heart rate and body fat percentage.

Common calculations in this category

The most common calculations here include BMI, TDEE, BMR, daily water, macros and target heart rate.

What differentiates these pages

Because health is sensitive, these pages avoid diagnostic promises, use visible disclaimers and add explanations about limits, formulas and safer interpretation.

Frequently asked questions

Do these calculators replace a doctor or dietitian?

No. They are educational and serve as a starting estimate. Clinical situations, pregnancy, lactation, heart disease or medication use require professional guidance.

Why do some calculators ask for more fields now?

Are health inputs sent to analytics?

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