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.

Free cholesterol ratio calculator. Enter total, HDL, LDL and triglycerides to get TC/HDL, LDL/HDL, TG/HDL, non-HDL and estimated LDL in seconds.