Your health numbers, finally explained
In-depth health guides paired with interactive tools. Every topic comes with expert-level articles, visual results, and citations from WHO, NIH, and peer-reviewed research.
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Every category covers both the tools and the knowledge to understand your results.
Pregnancy Weight Gain: Your Complete Guide
Understand healthy pregnancy weight gain week by week with IOM guidelines. Read our evidence-based guide, then use the interactive tracker to see where you stand with visual charts and personalized ranges.
All Calculators & Tools
40 tools available — each with an in-depth guide
Pregnancy Weight Gain Calculator
Week-by-week tracking based on IOM guidelines with visual trajectory chart.
TDEE Calculator
Total Daily Energy Expenditure using Mifflin-St Jeor equation.
BMI Calculator
Visual gauge with age and gender-adjusted interpretation.
Stress Level Test
PSS-10 based clinically validated stress assessment.
Due Date Calculator
Estimated delivery date from LMP, conception, or IVF transfer.
Macro Calculator
Personalized macro splits for keto, PCOS, balanced, and more.
HCG Doubling Time
Track early pregnancy HCG levels and doubling rate.
A1C to Blood Sugar Converter
Convert A1C percentage to estimated average blood sugar.
Body Fat Calculator
Navy method and skinfold-based body fat estimation.
Calorie Deficit Calculator
Calculate your ideal deficit for sustainable weight loss.
Ovulation Calculator
Predict your most fertile days based on cycle length.
Sleep Quality Calculator
PSQI-based sleep quality assessment with improvement tips.
Fetal Weight Percentile
Track baby's growth against WHO standards week by week.
Protein Intake Calculator
Daily protein needs based on weight, activity, and goals.
BMI Calculator for Teens
Age and sex-specific BMI percentiles for ages 2-19.
GFR Calculator
Estimate kidney function using the CKD-EPI 2021 equation.
Pregnancy Safe Food Checker
Search if a food is safe to eat during pregnancy.
BMR Calculator
Basal Metabolic Rate using Mifflin-St Jeor and Harris-Benedict.
One Rep Max Calculator
Estimate your 1RM with percentage-based training chart.
Ideal Weight Calculator
Four formulas compared — Devine, Robinson, Miller, Hamwi.
Burnout Quiz
Assess burnout risk across exhaustion, cynicism, and efficacy.
Anxiety Self-Assessment
GAD-7 clinically validated anxiety screening.
Lean Body Mass Calculator
Estimate lean mass using Boer and James formulas.
Calorie Calculator for Women Over 50
Daily calorie needs with menopause and sarcopenia considerations.
Contraction Timer
Track contraction frequency, duration, and the 5-1-1 pattern.
ADHD Self-Assessment
ASRS v1.1 Part A screener for adult ADHD.
Anemia Risk Checker
Symptom-based anemia risk screening.
Body Frame Size Calculator
Determine small, medium, or large frame from wrist measurement.
TDEE Calculator for Teens
Growth-adjusted calorie needs for ages 10-19.
Protein Needs for Seniors
Daily protein targets for 65+ to prevent sarcopenia.
Kidney Function Calculator
Detailed CKD staging with action recommendations.
Macro Calculator for PCOS
PCOS-specific macro splits by phenotype.
IVF Due Date Calculator
Due date from IVF transfer — 3-day or 5-day, fresh or FET.
Baby Growth Percentile
WHO growth standards from birth to 5 years.
Sleep Calculator
Ideal bedtime by sleep cycles and age group.
Cholesterol Ratio Calculator
TC/HDL, LDL/HDL, and triglyceride/HDL ratios.
Waist-to-Hip Ratio
WHO cardiovascular risk from waist and hip measurements.
Vitamin D Calculator
Daily IU needs by body weight and current level.
Thyroid Function Calculator
TSH interpretation with pregnancy-adjusted ranges.
Postpartum Depression Screening
Edinburgh Postnatal Depression Scale (EPDS).
Not just a number. A complete picture.
Most calculator sites give you a result and leave. We give you understanding.
Enter your data
Simple inputs with metric/imperial support. No signup, no accounts.
See visual results
Color-coded gauges, trajectory charts, comparison graphics.
Read the full context
A 2,000-word evidence-based article explains what your results mean.
Continue your journey
Related tools link together. TDEE → macros → protein — one flow.
Built on published science, not guesswork
Every calculator uses established, peer-reviewed formulas — Mifflin-St Jeor for TDEE, IOM guidelines for pregnancy, WHO growth standards for child development. We cite the exact equation and the original paper on every page.
Our articles pull information exclusively from authoritative sources: WHO, NIH, ACOG, Mayo Clinic, and PubMed studies. Every key claim is cross-referenced against at least two major medical references.
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Pick a calculator, get your results, and read the science behind them. Free, forever.
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