Health

Use our Calorie Calculator to estimate daily calories for maintenance, weight loss, or weight gain from age, sex, height, weight, and activity level.

Use our Conception Date Calculator to estimate conception date, due date, ovulation day, fertile window, and pregnancy progress from due date or LMP.

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

Use our INR Calculator to solve for INR, patient PT, control PT, or ISI with the standard PT/INR formula. Fast educational estimate online.

Use our ABSI (A Body Shape Index) Calculator to estimate A Body Shape Index from waist circumference, height, and weight. See BMI and understand central body-shape risk screening.

FFMI calculator to estimate fat-free mass index and normalized FFMI from weight, height, and body fat percentage in seconds.

Blood type calculator to estimate a child’s possible ABO and Rh blood types from the mother’s and father’s blood types.

Adjusted body weight calculator to estimate IBW and AjBW from sex, height, and actual body weight using a clear, fast clinical formula.

Child height percentile calculator to estimate height percentile by age, sex, and length or height using WHO growth data.