Health

How to choose a health calculator

Pick the tool that matches your question, read the how-it-works section on that page for assumptions and limits, then adjust inputs until the scenario looks like your real numbers. Results are for education and planning—not personalized professional advice.

• BMI Calculator — Calculate adult Body Mass Index from height and weight and see the matching WHO category range.
• BMR Calculator — Estimate basal metabolic rate with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle and map it to activity levels.
• Calorie Calculator — Estimate maintenance calories from BMR and activity, then plan deficit or surplus targets for weight goals.
• TDEE Calculator — Estimate total daily energy expenditure by combining a BMR formula with your typical activity multiplier.
• Body Fat Calculator — Approximate body fat percentage from common measurement formulas and visualize lean vs fat mass.
• Protein Calculator — Estimate daily protein targets from weight, activity, and goals, with adjustments for pregnancy or lactation.
• Ideal Weight Calculator — Calculate your ideal body weight using Devine, Robinson, Miller, and Hamwi medical formulas and healthy BMI range.
• Water Intake Calculator — Estimate recommended daily water hydration in liters, ounces, and glasses based on weight, activity, and climate.
• Heart Rate Zones Calculator — Calculate your maximum heart rate and target training zones for fat burning, aerobic cardio, and VO2 max.