Planning calculators
Quick, private calculators for the numbers behind your plans. No sign-up, no ads. Each one links to the offline planner that helps you act on the result.
Womens Health
Ovulation Calculator
Free ovulation calculator: find your fertile window, peak days and estimated ovulation date from your last period and cycle length. Then track it in a TTC planner.
Due Date Calculator
Free pregnancy due date calculator. Estimate your due date, current week, trimester and milestone dates from your last period, conception date or IVF transfer.
Period Calculator
Free period calculator. Predict the start and end of your next six periods from your last period and cycle length, with an estimated ovulation date for each.
Pregnancy Weight Gain Calculator
Free pregnancy weight gain calculator using IOM guidelines. See your recommended total gain and whether you are on track for your week, based on pre-pregnancy BMI.
Health & Wellness
TDEE Calculator
Free TDEE calculator using the Mifflin-St Jeor formula. Find your maintenance calories plus cut and bulk targets, then track the deficit in a weight-loss planner.
Sleep Calculator
Free sleep calculator. Find the best time to go to bed or wake up based on 90-minute sleep cycles, so you wake between cycles feeling more refreshed.
A1C Calculator
Free A1C to average blood glucose (eAG) converter. Enter your A1C to see your estimated average blood sugar in mg/dL and mmol/L, and vice versa.
Blood Pressure Calculator
Free blood pressure category checker using the ACC/AHA 2017 guidelines. Enter your systolic and diastolic numbers to see whether they are normal, elevated or high.
BMI Calculator
Free BMI calculator. Get your body mass index, WHO category and the healthy weight range for your height, in metric or imperial units.
Macro Calculator
Free macro calculator. Turn your daily calories into protein, carb and fat grams with balanced, high-protein, low-carb or keto splits, plus a fiber target.
Water Intake Calculator
Free water intake calculator. Estimate how much water to drink per day from your weight, exercise and climate, shown in liters, cups and fluid ounces.
Ideal Weight Calculator
Free ideal weight calculator. See a healthy weight range for your height from BMI, plus the Devine, Robinson, Miller and Hamwi clinical formulas.
Protein Calculator
Free protein calculator. See how many grams of protein to eat per day based on your weight and goal, from the RDA to muscle-building and age-65-plus ranges.
Caffeine Calculator
Free caffeine calculator. See how much caffeine is still in your system at bedtime and the latest time to have your last coffee for undisturbed sleep.
Body Fat Calculator
Free body fat percentage calculator using the US Navy tape method. Enter a few measurements to estimate body fat, fat mass and lean mass, no scan needed.