Free Health Calculators – Calories, Water Intake, Ideal Weight & Pregnancy
Personal health decisions start with understanding your own numbers - daily calorie needs, Total Daily Energy Expenditure (TDEE), optimal sleep cycle timing, how much water you actually need each day, what a healthy weight looks like for your height and frame, and your pregnancy due date and current week. These 6 calculators give you a personalized starting point based on your inputs, not a generic population average. All run in your browser with no account or data upload required.
Calorie Calculator
Calculate your daily calorie needs online free - no login. Enter your age, gender, weight (kg), height (cm), and activity level to get your BMR, TDEE, and a 500-calorie deficit/surplus estimate. Not medical advice.
Water Intake Calculator
Calculate how much water you should drink per day online free - no signup. Based on your weight, activity level, and climate, get a personalized daily hydration recommendation.
Ideal Weight Calculator
Calculate your ideal body weight online free - no login. Based on your height, gender, and frame size, get ideal weight ranges from multiple medical formulas.
Pregnancy Week Calculator
Calculate how many weeks pregnant you are online free - no login. Enter the first day of your last period or conception date to find your current pregnancy week and estimated due date.
TDEE Calculator
Free TDEE calculator to find your Total Daily Energy Expenditure, BMR, and daily calorie needs for weight loss, maintenance, or muscle gain.
Sleep Cycle Calculator
Free sleep cycle calculator to find the best time to wake up or go to sleep based on 90-minute sleep cycles so you feel refreshed every morning.
How to use these tools
Select the tool that matches your task, open it, and follow the steps below.
- Choose the calculator that matches your health question - daily calories, water intake, ideal weight, or pregnancy due date.
- Enter your personal data: weight, height, age, sex, and activity level where relevant.
- Review the personalized result and use it as a starting point for your health planning or appointment discussion.
Common ways to use these tools
- Calculate your daily calorie target for weight loss, maintenance, or muscle gain based on your actual activity level.
- Find your personalized daily water intake recommendation based on weight and climate.
- Check your ideal weight range using multiple formulas (Hamwi, Devine, BMI) to get a realistic healthy target.
- Calculate a pregnancy due date and current week from the last menstrual period or a confirmed conception date.