BMI, calorie, macro, body fat, water, pregnancy, and related calculators are useful for rough context, trend tracking, and scenario comparison.
Body and nutrition
Health Calculators
Quick health and fitness calculators for BMI, calorie estimates, weight ranges, and everyday wellness planning.
12 calculators liveFree to use
Category hub
Tools in this category
Health calculators cover body, nutrition, pregnancy, hydration, calorie, macro, and fitness planning. They provide screening or planning estimates and should be read alongside medical or nutrition guidance when the decision matters.
BMI CalculatorUse this BMI calculator to estimate body mass index, BMI category, and a healthy BMI weight range from pounds and feet/inches or kilograms and centimeters.OpenIdeal Weight CalculatorUse this ideal weight calculator to estimate a BMI-based adult weight range from US or metric height and compare it with current BMI.OpenBody Fat CalculatorUse this body fat calculator to estimate body fat percentage from height, weight, neck, waist, and hip measurements in pounds/inches or kilograms/centimeters.OpenCalorie CalculatorUse this calorie calculator to estimate maintenance calories, BMR, and simple daily targets for gradual weight loss or gain.OpenBMR CalculatorUse this BMR calculator to estimate resting daily calorie needs before activity is added.OpenTDEE CalculatorUse this TDEE calculator to estimate maintenance calories from BMR and activity level.OpenMacro CalculatorUse this macro calculator to convert a calorie target and macro split into grams of protein, carbs, and fat.OpenProtein Intake CalculatorUse this protein intake calculator to estimate daily protein grams from body weight and a chosen g/kg target.OpenWater Intake CalculatorUse this water intake calculator to estimate daily total water needs from reference adequate intakes and simple activity adjustments.OpenDue Date CalculatorUse this due date calculator to estimate a pregnancy due date from the first day of the last menstrual period and average cycle length.OpenPregnancy Week CalculatorUse this pregnancy week calculator to estimate gestational age from the first day of the last menstrual period.OpenConception Date CalculatorUse this conception date calculator to estimate conception timing from an estimated pregnancy due date.Open
How to use this hub
Pick the tool by task, then check the assumptions.
Category pages are meant to be useful on their own, not just lists. These notes explain what the group covers, where the limits are, and which pages deserve extra care.
Health results can vary by age, pregnancy, medication, training status, medical history, measurement method, and professional guidance.
Sensitive health pages surface source notes where a public medical or health reference helps explain the method or limitation.
Common tasks
Start with the job, then open the matching tool.
These task groups make the category useful as a hub page, not just an alphabetized list of links.
Use BMI, ideal weight, body fat, and related calculators as rough screening or planning checks.
Estimate calories, TDEE, BMR, macros, protein, and water intake with formulas and source notes visible.
Estimate due dates, pregnancy week, and conception timing for planning, not diagnosis.