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Free Health Calculators & Tools

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Twenty-four free health calculators, built on established clinical formulas and guidelines from the CDC, WHO, AHA, the Institute of Medicine, and peer-reviewed research. No sign-up, no app to install, nothing stored. Enter your numbers and get your answer instantly, on any device.

Body & Weight

BMI CalculatorFind out if your weight is in the healthy range.Open calculatorBody Fat CalculatorEstimate your body fat percentage from tape measurements.Open calculatorIdeal Weight CalculatorSee your ideal weight range for your height.Open calculatorWaist to Hip Ratio CalculatorCheck your waist to hip ratio and health risk level.Open calculatorBody Shape CalculatorFind out if you are an hourglass, pear, apple, or rectangle.Open calculatorLean Body Mass CalculatorHow much of your weight is not fat.Open calculator

Nutrition & Diet

Calorie CalculatorYour daily calorie needs for weight loss, maintenance, or gain.Open calculatorBMR CalculatorThe calories your body burns at complete rest.Open calculatorMacro CalculatorDaily protein, carb, and fat targets for your goal.Open calculatorProtein Intake CalculatorHow many grams of protein you need every day.Open calculatorWater Intake CalculatorHow much water you should drink every day.Open calculatorIntermittent Fasting CalculatorYour fasting and eating window times.Open calculator

Pregnancy, Fertility & Family

Pregnancy Due Date CalculatorEstimate when your baby will arrive.Open calculatorOvulation CalculatorFind your fertile window and best days to conceive.Open calculatorPregnancy Weight Gain CalculatorHealthy weight gain targets for each pregnancy week.Open calculatorPeriod CalculatorPredict your next six periods.Open calculatorChild Height PredictorHow tall will your child grow up to be?Open calculator

Fitness & Sleep

Heart Rate Zone CalculatorYour target heart rate zones for training.Open calculatorCalories Burned CalculatorCalories burned in 20+ activities and workouts.Open calculatorSleep CalculatorThe best bedtime for your wake up time.Open calculatorSteps to Calories CalculatorWhat your daily steps are really worth.Open calculator

Everyday Health

Blood Pressure CheckerWhat your blood pressure reading means.Open calculatorA1C CalculatorConvert A1C to average blood sugar and back.Open calculatorCaffeine CalculatorHow much coffee is safe for you per day.Open calculator

About These Tools

Every calculator on this page runs entirely in your browser. We do not collect, store, or transmit anything you type. Each tool’s page explains the formula behind it, shows the reference ranges doctors use, and answers the most common questions, so you understand the number you get, not just receive it.

The results are educational reference points, not medical advice. Bodies differ, and no formula knows your history. For decisions about your health, medication, pregnancy, or diet, talk to a licensed healthcare provider who does.

Missing a calculator you would find useful? Tell us and we will consider building it next.

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