Health Calculators
Estimate BMI, calories, age, and health-related numbers with practical calculators for personal planning and tracking.
Health calculators are for general planning and quick checks, with formulas shown so results are easier to understand.
Why this category matters
Health calculators group related formulas so visitors can compare nearby tools instead of landing on a single isolated calculator page.
How to choose a calculator
Pick the task that matches the result you need, then review the formula shown on the calculator page. Related tools are linked when another calculation may fit better.
Accuracy guidance
Enter the original values carefully and round after the result is shown. For health, finance, construction, or schoolwork, verify the formula matches the method your task expects.
What to open next
Open the calculator that matches the result label you need. If the first result is not the right fit, use the category list and related links to move to a nearby formula without starting your search over.
Health tools
BMI Calculator
Calculate your Body Mass Index (BMI).
Formula: BMI = weight(kg) / height(m)²
Calories Burned Calculator
Estimate calories burned during exercise.
Formula: Calories = MET * weight(kg) * time(hours)
Age Calculator
Calculate age from birth date.
Formula: Age = Current Date - Birth Date
Body Fat Calculator (Navy Method)
Estimate body fat percentage using Navy circumference method.
Formula: Body fat % using Navy equations based on sex assigned at birth and body measurements
Ideal Weight Calculator
Calculate ideal weight ranges using multiple formulas (Robinson, Miller, Devine, Hamwi).
Formula: Various formulas based on height and sex assigned at birth
Hydration Calculator
Calculate daily water intake recommendation based on weight and activity level.
Formula: Water (L) = Weight (kg) × 0.033 + Activity Adjustment
Running Pace Calculator
Calculate running pace, time, or distance from any two values.
Formula: Pace = Time / Distance
Heart Rate Zones Calculator
Calculate training heart rate zones based on age and resting heart rate.
Formula: Karvonen formula: Target HR = ((MHR - RHR) × Intensity%) + RHR
Macro Calculator
Calculate daily macronutrients based on your goals.
Formula: Protein = weight * 2.2g; Carbs = calories * 0.50 / 4; Fat = calories * 0.25 / 9
Pregnancy Calculator
Calculate due date and pregnancy milestones from last menstrual period.
Formula: Due Date = LMP + 280 days
Ovulation Calculator
Predict your next ovulation and fertile window.
Formula: Ovulation = LMP + cycleLength - 14 days