Health calculators

Calculate your body mass index from height and weight in lb and ft or kg and cm. See your category, the healthy weight range for your height and a BMI chart from 4′10″ to 6′4″.

Calculate BMI and BMI-for-age percentile for a child or teen aged 2 to 19, in kg and cm or lb and ft. CDC or WHO growth reference, the category, and BMI charts by age for boys and girls.

Set a target weight and a deadline to see how many calories to eat per day, or set your calories to see when you will get there. With a safe-pace check and a week-by-week plan.

Calculate your fat-free mass index from weight, height and body fat. See where you sit on the FFMI scale, your lean mass, and how much muscle you could still add naturally.

Find out how many calories you burn per day, and how much to eat to lose, keep or gain weight. Uses the Mifflin-St Jeor equation.

Find your daily protein target in grams based on weight and goal: fat loss, muscle gain, general health, endurance or age. With a per-meal split and food equivalents.

Add up the protein in what you eat: pick foods, enter grams or ounces and eggs, and see the total against your daily target. With a protein chart per 100 g for 38 foods.

Work out how much water to drink per day from your weight, age, exercise, climate and pregnancy. Result in liters, ounces and glasses, with a simple daily schedule.

Estimate your one-rep max from a set you have already done. Compare the Epley, Brzycki, Lander and Lombardi formulas, and get a training table of working weights from 60% to 100%.

Work out running pace, finish time or distance from the other two, in kilometers or miles. Enter any distance you like. With a split for every kilometer or mile and equivalent times at 5K, 10K, half and full marathon.

Work out your estimated due date from your last period, the date of conception, or an IVF transfer. See how many weeks pregnant you are today, your trimester and the key dates ahead.

Find your estimated ovulation date and fertile window from your last period and cycle length. Day-by-day chances, when to test, and the due date if you conceive this cycle.

Enter the first day of your last period and your cycle length to see when your next period is due, your current cycle phase, and the next six months of dates.

Estimate your blood alcohol content from drinks, drink size, strength, weight, sex and hours since you started. See how you compare to driving limits and how long until you are sober.

Find the right dose of children’s paracetamol in the UK, such as Calpol Infant (120 mg/5 ml) and Calpol Six Plus (250 mg/5 ml), by your child’s age, with the NHS limits on doses and timing.

Find the right dose of infant or children's Tylenol (acetaminophen) by weight, in mL or tablets for the product you have. Based on the AAP dosing table, with the 24-hour maximum and safety checks.

Count your days, weeks and months sober from your sobriety date, see your next milestone dates, and what you have saved in drinks, money and calories.