Heart Rate Calculator - Max HR Zones

Heart rate calculator for training — free max heart rate and heart rate zones. INTRODUCTION Train smarter with Trencada's free heart rate calculator. Enter your age and optional resting heart rate to get your estimated max heart rate and five training zones — from recovery to maximum effort — using the Tanaka, classic or Gellish formula with the Karvonen method. Runs entirely in your browser — no signup needed. HOW TO USE 1. Enter your age and (optionally) your resting heart rate, measured first thing in the morning. 2. Pick a max-HR formula — Tanaka is the most researched. 3. Click Calculate to see your max heart rate and five training zones. 4. Zone 2 (60–70%) is the classic fat-burn and endurance zone. KEY FEATURES - Max heart rate via Tanaka, classic (220-age) and Gellish formulas. - Five training zones with bpm ranges and color bars. - Karvonen method when resting HR is provided. - Heart rate reserve and Zone 2 (fat burn) highlights. - 100% client-side — nothing uploaded or stored. WHY CHOOSE TRENCADA No signup, no paywall, no app. The heart rate calculator works entirely in your browser and gives runners and cyclists the zones they need to train with intent — free forever. FAQ 1. Is the heart rate calculator really free? Yes — unlimited calculations, free forever, no account needed. 2. Which formula is best? Tanaka (208 − 0.7 × age) is the most researched and the default here. 3. What is the fat-burn zone? Zone 2, roughly 60–70% of max HR, is the classic fat-burn and endurance zone. 4. Is this medical advice? No — estimates only; consult a professional before intense training.