❤️Heart Rate & Fitness Calculators

Fitness calculators — heart rate, training zones and blood alcohol content

This wizard combines two useful fitness and health calculators: heart rate and training zones calculator, and blood alcohol content (BAC) calculator. Everything runs locally in your browser — no registration, no ads, no data sent to a server.

Heart rate calculator computes maximum heart rate (HRmax) and defines five training zones, helping you plan your workout according to your goal: fat burning, improving aerobic endurance, or high-intensity interval training.

BAC calculator estimates blood alcohol concentration based on the drink consumed, body weight, and time elapsed. The result is indicative only and does NOT qualify you to drive a vehicle or operate machinery. The only reliable way to confirm sobriety is a breathalyser test or blood test. Never get behind the wheel if you have consumed alcohol.

Indicative results

All calculations are performed locally in your browser — no data leaves your device. Results are indicative and do not replace advice from a doctor, personal trainer, or specialist tests.

Frequently asked questions

How do I calculate maximum heart rate and training zones?

The most popular formula is 220 minus age. Training zones are set as percentages of maximum heart rate: zone 1 (50–60%) is recovery, zone 2 (60–70%) — fat burning, zone 3 (70–80%) — aerobic endurance, zone 4 (80–90%) — anaerobic threshold, zone 5 (90–100%) — maximum intensity.

How much alcohol does the body eliminate per hour?

On average the body eliminates about 0.1–0.15 per mille of alcohol per hour. The rate depends on body weight, sex, metabolism and other factors. The BAC calculator provides an indicative result only — it cannot be used to assess fitness to drive.

When is resting heart rate a concern?

In adults, a normal resting heart rate is 60–100 beats per minute. Values below 60 bpm (bradycardia) or above 100 bpm (tachycardia) may require medical attention, although a low resting heart rate is normal in athletes. If in doubt, consult a doctor.