Fitness Age Calculator

Estimate how old your body really is based on fitness and lifestyle factors

Health

Fitness

Wellness

Calculator

Your Information

Chronological Age (years)

Sex

Resting Heart Rate (bpm)

Measure after sitting quietly for 5 minutes

Activity Level

Max Push-ups (in one set)

How many push-ups can you do without stopping?

Flexibility (sit-and-reach)

Waist Circumference (cm)

Height (cm)

Average Sleep (hours/night)

Stress Level (1-10)

Smoking Status

About This Tool

The Fitness Age Calculator estimates your biological fitness age by evaluating five key health and fitness domains: cardiovascular fitness, muscular strength, flexibility, body composition, and lifestyle habits. Your fitness age may be lower or higher than your chronological age depending on these factors.

This tool uses research-backed benchmarks including resting heart rate norms, age-adjusted push-up standards, waist-to-height ratio thresholds, and lifestyle impact scores. For a more detailed body composition analysis, try our Body Fat Percentage Calculator. If you want to track your daily nutrition alongside fitness, our Daily Calorie Needs Calculator can help estimate your BMR and TDEE.

Staying well-hydrated is also key to maintaining peak fitness — check out our Water Intake Calculator for personalized hydration recommendations.

All processing happens entirely in your browser — no personal health data is sent to any server. Your calculation history is stored locally and can be cleared at any time.

Frequently Asked Questions (FAQ)

What is fitness age?

Fitness age is an estimate of your body's biological age based on cardiovascular fitness, strength, flexibility, body composition, and lifestyle factors. It can be higher or lower than your actual (chronological) age. A lower fitness age indicates better overall fitness and health.

How is fitness age calculated?

This calculator evaluates five key domains: cardiovascular fitness (resting heart rate + activity level), muscular strength (push-up capacity vs age-adjusted benchmarks), flexibility (sit-and-reach estimate), body composition (waist-to-height ratio), and lifestyle factors (sleep, stress, smoking status). Each domain adjusts your chronological age up or down.

What is a good resting heart rate?

A normal resting heart rate for adults ranges from 60 to 100 bpm. Well-trained athletes may have resting heart rates as low as 40-50 bpm. Generally, a lower resting heart rate indicates more efficient heart function and better cardiovascular fitness. You can measure yours by sitting quietly for 5 minutes and counting your pulse for 60 seconds.

How accurate is this fitness age estimate?

This calculator provides a general estimate based on well-established health and fitness markers. It is not a medical diagnosis. For a precise assessment, consult a healthcare professional or exercise physiologist who can perform lab-based VO2max testing and comprehensive fitness evaluations.

Can I lower my fitness age?

Yes! Regular aerobic exercise, strength training, flexibility work, adequate sleep (7-9 hours), stress management, and maintaining a healthy waist-to-height ratio can all help lower your fitness age. Even small improvements in activity level can make a meaningful difference. Track your progress over time using the calculation history feature below.

Is my data safe?

Absolutely. All calculations happen entirely in your browser. No personal health data is sent to any server. Your calculation history is stored only in your browser's local storage and can be cleared at any time.

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