Free Heart Rate Zones Calculator Online
Calculate your 5 heart rate training zones for fat burn, cardio, and peak performance based on maximum heart rate using Karvonen or 220-minus-age formula. — 100% free online utility, zero sign-up, zero paywalls, and private client-side processing.
How It Works
Enter Age & Resting HR
Input your age and resting heart rate (measured first thing in the morning).
Calculate Max Heart Rate
Get estimated max HR using 220-age or provide your tested max HR.
View 5 Training Zones
See BPM ranges for each zone: Recovery, Fat Burn, Aerobic, Threshold, and VO2 Max.
Frequently Asked Questions
Related Health & Fitness Calculators & Utilities
Interlinked precision tools in the Health & Fitness collection.
Daily Calorie Calculator (TDEE)
Calculate your Total Daily Energy Expenditure (TDEE) and optimal calorie intake for weight loss, maintenance, or muscle gain using Harris-Benedict or Mifflin-St Jeor.
Body Fat Percentage Calculator
Estimate body fat percentage using Navy Method (waist, hip, neck measurements) and BMI method. Get lean mass vs fat mass breakdown with health category classification.
BMI Calculator & Healthy Weight Range
Calculate BMI with WHO adult classification, healthy weight range, Ponderal Index, and resting Basal Metabolic Rate using Mifflin-St Jeor equation.
Macro Calculator (Protein, Carbs & Fat)
Calculate optimal daily protein, carbohydrates, and fat intake in grams based on your goal (weight loss, muscle gain, or athletic performance) and body composition.
Ideal Weight Calculator
Calculate ideal body weight using 5 evidence-based formulas: Devine, Robinson, Miller, Hamwi, and Lemmens. Compare results and understand healthy weight ranges.
Daily Water Intake Calculator
Calculate your optimal daily water intake based on body weight, activity level, and climate. Get hydration goals in liters, cups, and glasses with hourly reminders.