All Health Tools
Browse calculators and educational guides by topic. Each page explains its current method and limits.
Pregnancy Weight Gain Calculator
Pre-pregnancy BMI, current gain and total-gain guidance for singletons or twins.
Calculator + Guide →TDEE Estimate
Mifflin–St Jeor resting estimate times an explicitly labeled site activity assumption.
Calculator + Guide →BMI Calculator
Adult BMI from height and weight; screening limitations explained.
Calculator + Guide →Perceived Stress Scale information
PSS permission and interpretation information.
Calculator + Guide →Due Date Calculator
Estimated delivery date from LMP, conception, or IVF transfer.
Calculator + Guide →Macro Calculator
Illustrative macro splits for selected calorie and diet preferences.
Calculator + Guide →HCG Doubling Time
Arithmetic hCG change and doubling or halving time; no pregnancy diagnosis.
Calculator + Guide →A1C to Blood Sugar Converter
Convert A1C percentage to estimated average blood sugar.
Calculator + Guide →Body Composition Estimate
Apply a documented military circumference equation to entered measurements.
Calculator + Guide →Calorie Difference Calculator
Subtract user-entered calorie values; no target or rate is recommended.
Calculator + Guide →Ovulation Calculator
Estimated six-day calendar window with explicit assumptions and limits.
Calculator + Guide →Sleep Quality Calculator
Estimate sleep duration and efficiency from a diary.
Calculator + Guide →Fetal Weight Percentile Guide
Understand ultrasound weight percentiles and clinical references.
Calculator + Guide →Protein Intake Reference
Apply the current U.S. guideline range to an entered weight; not a personal prescription.
Calculator + Guide →BMI Calculator for Teens
Age and sex-specific BMI percentiles for ages 2-19.
Calculator + Guide →GFR Calculator
Estimate kidney function using the CKD-EPI 2021 equation.
Calculator + Guide →Pregnancy Safe Food Checker
Find source-linked food guidance; preparation and food type matter during pregnancy.
Calculator + Guide →Resting Energy Estimate
Mifflin–St Jeor estimate for its original healthy adult age range.
Calculator + Guide →One-repetition maximum estimate information
Published equations and population limits; no active estimator.
Calculator + Guide →Historical Weight Equations
Four historical equation outputs; not personal weight targets.
Calculator + Guide →WHO Burnout Guidance
WHO definition of burnout and occupational scope.
Calculator + Guide →GAD-7 Screening Questionnaire
Seven-item symptom screen and its study-specific limits.
Calculator + Guide →Lean Body Mass Equation Estimate
Calculate the Boer equation output with study limits.
Calculator + Guide →Resting Energy Estimate for Women 50–78
Female Mifflin–St Jeor resting-energy estimate, not a calorie intake target.
Calculator + Guide →Contraction Timer
Record contraction duration and start-to-start intervals; no labor assessment.
Calculator + Guide →Adult ADHD Screening Guidance
Official adult ADHD screening resources and limits.
Calculator + Guide →Anemia Risk Checker
Why anemia symptoms need clinical assessment and testing.
Calculator + Guide →Teen Nutrition Guidance
NIDDK and Canadian teen nutrition guidance; no calorie target.
Calculator + Guide →Protein Reference for Healthy Older Adults
ESPEN European population guidance; arithmetic range, not a personal prescription.
Calculator + Guide →Adult eGFR Equation Calculator
Calculate an adult CKD-EPI 2021 eGFR estimate; no diagnosis or treatment guidance.
Calculator + Guide →PCOS Nutrition Guidance
Evidence-based guidance on diet composition for PCOS.
Calculator + Guide →IVF Due Date Calculator
Due date from IVF transfer — 3-day or 5-day, fresh or FET.
Calculator + Guide →WHO Baby Weight-for-age Percentile
WHO daily weight-for-age reference from birth to five years; local clinical chart guidance may differ.
Calculator + Guide →Sleep Calculator
Plan bedtime using wake time and desired sleep duration.
Calculator + Guide →Cholesterol Ratio Calculator
TC/HDL, LDL/HDL, and triglyceride/HDL ratios.
Calculator + Guide →Waist-to-Hip Ratio
Waist divided by hip circumference; measurement limits explained.
Calculator + Guide →Vitamin D Calculator
US age-based recommended total intake reference.
Calculator + Guide →Thyroid Function Calculator
Compare values with your own laboratory reference intervals.
Calculator + Guide →EPDS information
Screening limits, source information and reproduction conditions.
Calculator + Guide →