Kalkulator za vježbanje zone otkucaja srca

The Heart Rate Zone Training Calculator computes your five training zones (Zone 1 through Zone 5) using either the Karvonen Heart Rate Reserve formula (recommended — accounts for individual cardiovascular fitness via resting heart rate) or the simpler percentage-of-maximum-heart-rate method. Zone-based training is the foundation of structured cardiovascular training across running, cycling, swimming, rowing, and other endurance disciplines: Zone 2 builds aerobic capacity and mitochondrial density, Zone 4 develops lactate threshold, and Zone 5 increases VO₂ max. The 80/20 rule — popularized by Stephen Seiler's research on elite endurance athletes — shows that most successful endurance athletes spend approximately 80% of training time in Zone 2 (the highest sustainable aerobic intensity) and 20% in Zones 4–5 (threshold and VO₂ max work). This polarized training distribution produces better adaptations than the 'moderate intensity' Zone 3 training that most recreational athletes default to. The 80/20 split applies across distance running, cycling, cross-country skiing, swimming, and rowing. The calculator's max-heart-rate formula uses Tanaka et al. (2001): MaxHR = 208 − (0.7 × Age). This is significantly more accurate than the older 220-age rule, especially for older adults where the original formula systematically underestimates max HR. The Karvonen formula then computes each zone as: Zone HR = RestingHR + (HRR × Zone%), where HRR = MaxHR − RestingHR. This approach personalizes zones based on your individual cardiovascular fitness — athletes with low resting HR (40s–50s) have wider zones than untrained individuals with resting HR in the 70s. This calculator provides starting estimates for setting heart rate monitor zones on Garmin, Whoop, Apple Watch, Polar, or other devices. For elite training precision, lactate threshold testing or a treadmill VO₂ max test provides personalized values that supersede formula-based estimates. For 95% of recreational athletes, the formula-based zones are accurate enough to guide training effectively. The calculator also outputs the Heart Rate Reserve, which is useful for tracking fitness improvements: as cardiovascular fitness improves, resting HR decreases and HRR increases, even when max HR stays constant.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

1. 1Step 1 — Enter Your Age: Used in the Tanaka formula 208 − (0.7 × Age) to estimate maximum heart rate. This formula is significantly more accurate than the traditional 220 − Age rule, especially for older adults. For a 35-year-old, Tanaka gives MaxHR = 184 bpm vs the older formula's 185 bpm; for a 60-year-old, Tanaka gives 166 vs the older formula's 160 (which underestimates by 6 bpm).
2. 2Step 2 — Enter Resting Heart Rate: Measure first thing in the morning before getting out of bed. Lie still for 1 minute, count beats for 60 seconds, or check your smartwatch's morning RHR. Average over 3 consecutive days for accuracy. Resting HR varies significantly with sleep, hydration, stress, and caffeine — single readings can be misleading.
3. 3Step 3 — Choose Calculation Method: Karvonen (recommended) uses Heart Rate Reserve to personalize zones based on individual fitness. Two athletes of the same age but different fitness levels will have different zones with Karvonen but identical zones with the simpler %Max method. Karvonen is the standard in clinical exercise physiology and elite endurance coaching.
4. 4Step 4 — Calculate Heart Rate Reserve: HRR = MaxHR − RestingHR. This is the dynamic range available for training. Untrained individuals: HRR ~100–120 bpm. Fit recreational: ~120–140 bpm. Elite endurance: ~150–170 bpm. HRR increases as cardiovascular fitness improves through reduced resting HR.
5. 5Step 5 — Compute Each Zone (Karvonen Method): Zone HR = RestingHR + (HRR × Zone%). For a 35-year-old with resting HR 60 (MaxHR 184, HRR 124): Z2 = 60 + (124 × 0.60) to 60 + (124 × 0.70) = 134–147 bpm. Z4 = 60 + (124 × 0.80) to 60 + (124 × 0.90) = 159–172 bpm. The Karvonen formula produces narrower, more individualized zones than %Max.
6. 6Step 6 — Compute Each Zone (%Max Method): Simpler alternative: Zone HR = MaxHR × Zone%. For the same 35-year-old (MaxHR 184): Z2 = 184 × 0.60 to 184 × 0.70 = 110–129 bpm. Note the difference — %Max produces lower Zone 2 numbers because it doesn't account for the resting HR floor. For untrained individuals, this can mean Zone 2 falls below their walking heart rate.
7. 7Step 7 — Apply to Training: Set up your heart rate monitor with the calculated zones. Aim for 80% of weekly cardio time in Zone 2 (the polarized 80/20 rule from elite athlete research). Use Zone 4 (lactate threshold) for tempo runs/intervals lasting 8–20 minutes total. Use Zone 5 (VO₂ max) for short intervals (3–8 minutes) totaling 15–30 minutes per week.

• !Using the old 220-age formula — the Tanaka formula (208 − 0.7 × Age) is significantly more accurate, especially for older adults where 220-age systematically underestimates by 5–10 bpm.
• !Skipping Karvonen and using %Max — Karvonen accounts for individual fitness via resting HR and gives more accurate, training-relevant zones especially for untrained individuals.
• !Measuring resting HR after caffeine or stress — measure in bed first thing in morning, ideally averaged over 3 consecutive days, for accurate baseline.
• !Training too hard in Zone 2 — the most common mistake; if you can't hold a conversation in full sentences, you're above Zone 2 and not getting the aerobic base benefit you think you are.
• !Treating zone boundaries as hard cliffs — zones overlap and your perceived effort matters more than 2-bpm precision. Z2 ceiling at 147 bpm and Z3 floor at 147 bpm refer to the same intensity transition.