Health & Body
Understand the numbers your body and your doctor care about. 12 free tools, no signup.
Blood Type Calculator
Who you can donate to and receive from, and what type a child could be.
BMI Calculator
Body mass index from your height and weight, with your healthy weight range.
Body Fat Calculator
Estimate body fat percentage from tape measurements, no calipers needed.
Calorie Calculator
Daily calories to maintain, lose or gain weight, from the Mifflin-St Jeor equation.
Colour Blindness Test
A quick screening test for red-green colour vision deficiency.
Heart Rate Zone Calculator
Your five training zones, from maximum heart rate or resting heart rate.
Ideal Weight Calculator
A healthy weight range for your height, from four established formulas.
Medicine Schedule Planner
Turns "three times a day" into actual times, and tracks today’s doses.
Period Tracker
Predicts your next few periods and fertile window, stored only on your device.
Sleep Calculator
Bedtimes and wake times that land between sleep cycles, not in the middle of one.
Step Counter
Log daily steps, convert to distance and calories, and track a weekly goal.
Water Intake Calculator
A daily water target based on your weight, activity and climate.