Body & Weight
Nutrition & Diet
Pregnancy, Fertility & Family
Fitness & Sleep
Everyday Health
Start with a Question
Each of these guides answers one question with its numbers, then points you to the calculators that give yours.
- How much should I weigh? BMI, waist, ratio and body fat side by side, with the range for each.
- How many calories should I eat a day? Your maintenance figure, the deficit that works, and the floors that keep it safe.
- Menstrual cycle phases The four phases day by day, and the period and ovulation tools that track them.
- What is a normal blood pressure? The reading, the categories, and the mean arterial pressure behind them.
- How to fall asleep faster Sleep timing, cycles and the numbers that move them.
- How to start working out Heart rate zones, calories burned and a first month that holds.
- What supplements should I take? What the evidence supports, dose by dose.
- Skin care routine for women over 40 The routine, the actives, and the skin type quiz.
- Lower back pain exercises What to do, what to avoid, and when the pain scale says to see someone.
About These Tools
Every calculator on this page runs entirely in your browser: nothing you type is collected, stored or sent anywhere. The meal matcher is the one exception, and only partly. It sends the two targets you set so the server can weigh the food against them, and it keeps neither them nor anything else. 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.