A1c Calculator
Enter an A1c or an average blood sugar and get the other, in mg/dL and mmol/L, with the ADA category and the IFCC mmol/mol value labs outside the US report.
Tools
Health calculators
Free, no sign-up, nothing stored. Each calculator comes with the formula it uses, a reference table and the honest limits of the number it gives you.
Blood Pressure Chart
Enter your top and bottom numbers to see your category on the current US chart, what a normal blood pressure is at any age, and how to take a reading at home that your doctor will trust.
BMI Calculator
Enter height and weight to get your body mass index, see where it lands on the CDC and WHO adult chart, and learn when the number should not be trusted on its own.
Body Fat Calculator
Estimate your body fat percentage with a tape measure using the US Navy method, then see where it falls on the ACE chart for women and men.
Calorie Calculator
Estimate your maintenance calories from the Mifflin-St Jeor equation, then see a daily target and macro split for losing, holding or gaining weight.
Calories Burned Calculator
Pick an activity, enter your weight and the minutes you spent, and get the calories you burned from the same MET values researchers use, with a table for walking, running, cycling and more.
Children's Tylenol Dosage by Weight
Enter your child's weight to see the dose from the US label chart for children's acetaminophen liquid, 160 mg per 5 mL, plus the limits the label puts around it.
Creatine Dosage Calculator
Enter your body weight to get a daily creatine monohydrate dose, an optional loading phase split into four servings, and how long each route takes to fill your muscle stores.
Due Date Calculator
Estimate your due date from your last period, conception date or IVF transfer, see how many weeks pregnant you are today, your trimester, and the milestone dates ahead.
Health Screening Schedule by Age
Enter your age and sex to see which screenings and vaccines are due now, which are coming up, and which to ask about, based on the USPSTF A and B recommendations and the CDC adult schedule.
Heart Rate Zones Calculator
Enter your age, and optionally your resting pulse, to get your estimated max heart rate and five training zones, with the Karvonen version and the honest limits of any formula.
Ideal Weight Calculator
Your ideal body weight by height and sex from the four classic formulas, plus the healthy BMI range that matters more than any single number.
Menopause Symptom Quiz
Rate 11 symptoms on the validated Menopause Rating Scale to get a total score, three subscale scores and a plain-English read on whether it is time to talk to a clinician, plus the cycle clues that actually stage perimenopause.
Ovulation Calculator
Enter the first day of your last period and your cycle length to estimate your ovulation day, six-day fertile window, next period and earliest pregnancy-test date, and learn when the calendar cannot be trusted.
Period Calculator
Enter the first day of your last period, your cycle length and how long you bleed to see your next three periods, the estimated ovulation day and fertile window, and how many days you are from your next period or how late it is.
Protein Calculator
Find out how much protein you should eat per day, in grams, based on your weight, your age and whether you want to lose fat, build muscle or simply stay strong.
Sleep Calculator
Enter the time you need to wake up, or the time you are going to bed, and get bed and wake times built from 90-minute sleep cycles, plus how many hours adults, teens and people over 65 actually need.
Steps to Miles Calculator
Convert your daily step count into miles and kilometers using a stride length estimated from your height, with walking time at 3 mph and a rough calorie figure.
Waist to Height Ratio Calculator
Enter your waist and height, and optionally your hips, to get your waist-to-height ratio, see where it lands on the Ashwell and NICE bands, and check your waist-to-hip ratio against the WHO cutoffs.
Water Intake Calculator
Enter your weight, sex, activity and climate to get a daily fluid target from drinks in ounces, liters and cups, based on the National Academies' adequate intake rather than the 8×8 myth.