Free face shape calculator using forehead, cheekbones, jawline and face length to classify your face as oval, round, square, heart or diamond.

Estimate your conception date, due date, and gestational age using due date or LMP with this free conception date calculator.

Predict your next period start/end, ovulation day, and fertile window from LMP and cycle length with this free period calculator.

Calculate INR instantly using patient PT, control PT, and ISI. Fast, accurate, and mobile-friendly INR calculator online.

Convert mmol/L to mg/dL (or mg/dL to mmol/L) instantly using molar mass. Includes glucose presets + custom molecules. Live, accurate, simple.

Estimate a child’s possible blood types from parents’ ABO and Rh factors. Get instant % chances for A, B, AB, O, Rh+ and Rh−.

Check your child’s height percentile (0–5 years) using the WHO LMS method. Enter age, sex, and height to get percentile, z-score, and band.

Calculate your IQ percentile using μ=100 and σ=15 or 16. See percentile plus percent above and below instantly with live results.

Estimate your child’s future adult height using Khamis–Roche or mid-parental method. Works in cm/kg or ft/in/lb. Fast & free.