Health calculators
Free Health calculators. Pick one to get started.
BMI Calculator
Enter your height and weight, in metric or imperial units, to see your Body Mass Index and category.
OpenDaily Calorie Calculator
Estimate the calories your body burns at rest and across your day.
OpenPregnancy Due Date Calculator
Estimate your due date and how many weeks along you are, based on your last period.
OpenA1C to Average Blood Sugar Calculator
Convert an A1C percentage to an estimated average blood glucose level.
OpenBlood Sugar Converter (mg/dL ↔ mmol/L)
Convert a blood glucose reading between mg/dL and mmol/L.
OpenSleep Calculator
Work out the best time to sleep or wake up so you finish on a full sleep cycle and wake up less groggy.
OpenBody Fat Calculator
Estimate your body fat percentage using the US Navy tape method and a few measurements.
OpenIdeal Weight Calculator
Estimate a healthy target weight for your height using three well-known formulas.
OpenMacro Calculator
Split your daily calories into protein, carbs and fat for the diet style you choose.
OpenCalories Burned Calculator
Estimate how many calories an activity burns from your weight and how long you did it.
OpenBody Surface Area (BSA) Calculator
Work out your body surface area in square metres using the Mosteller formula.
OpenLean Body Mass Calculator
Estimate how much of your body weight is lean mass versus fat, using the Boer formula.
OpenWater Intake Calculator
Estimate how much water to drink each day from your weight and exercise.
OpenOvulation Calculator
Estimate your ovulation day and fertile window from your last period and cycle length.
OpenPeriod Calculator
Predict your upcoming period dates from your last period and average cycle length.
OpenPregnancy Weight Gain Calculator
See the healthy total weight gain range for your pregnancy based on your starting BMI.
OpenConception Calculator
Estimate when conception likely happened, based on your due date.
OpenOne Rep Max (1RM) Calculator
Estimate the most you could lift for a single rep from a set you have already done.
OpenRunning Pace Calculator
Turn a distance and a time into your pace per km and per mile, plus your speed.
OpenTarget Heart Rate Calculator
Find your max heart rate and the training zones for moderate and vigorous exercise.
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