# Karvonen Heart Rate Zone Calculator Estimate your target heart rate training zones using the Karvonen formula based on resting and maximum heart rate for workouts. --- - **Canonical URL:** https://dothecalculation.com/calculators/heart-rate-reserve-karvonen-calculator - **Category:** Health and fitness - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology - **Reviewed by:** Dr. Sarah Jenkins, PhD, PhD in Exercise Physiology & Metabolism, Stanford University (https://dothecalculation.com/about/team/sarah-jenkins) --- ## Karvonen Heart Rate Target Zones Calculate target heart rate training zones using the Karvonen formula based on your Heart Rate Reserve (HRR). - HRR calculation (Max HR minus Resting HR) - Gellish age-adjusted maximal heart rate formula - Five structured cardiovascular training zones ## Why the Karvonen Formula is Superior to Standard Heart Rate Zones Standard heart rate zone formulas (like the simple $220 - \text{age}$) assume everyone of the same age has the same cardiovascular baseline. The **Karvonen Formula** is superior because it factors in your **Resting Heart Rate**, using **Heart Rate Reserve (HRR)** to customize training zones. HRR represents the true range of your heart's operational capacity. Tracking your heart rate zones helps you program aerobic base development (Zone 2) or anaerobic threshold work, and pairs with our [pace calculator](/calculators/pace-calculator) and [workout planner](/calculators/workout-calculator). ## The Mathematics of the Karvonen Equation First, the calculator estimates your maximal heart rate ($HR_{\text{max}}$) using the validated **Gellish formula**: $$HR_{\text{max}} = 207 - 0.7 \times \text{age}$$ Next, we calculate **Heart Rate Reserve (HRR)** by subtracting your resting heart rate ($HR_{\text{rest}}$) from max heart rate: $$\text{HRR} = HR_{\text{max}} - HR_{\text{rest}}$$ Finally, the target heart rate ($HR_{\text{target}}$) for any intensity percentage ($I$) is calculated as: $$HR_{\text{target}} = (\text{HRR} \times I) + HR_{\text{rest}}$$ For example, at 70% intensity: $HR_{\text{target}} = (\text{HRR} \times 0.70) + HR_{\text{rest}}$. ## The Five Cardiovascular Training Zones The Karvonen formula divides aerobic work into five progressive zones: * **Zone 1 (50-60% Intensity)**: Active recovery and warm-up. * **Zone 2 (60-70% Intensity)**: Aerobic base building. Maximizes fat oxidation and mitochondrial density. * **Zone 3 (70-80% Intensity)**: Tempo/aerobic endurance. Builds stamina and cardiorespiratory power. * **Zone 4 (80-90% Intensity)**: Anaerobic threshold. Improves lactate tolerance and maximal running velocity. * **Zone 5 (90-100% Intensity)**: VO2 Max intervals. Enhances absolute cardiac output and stroke volume. ## How to Use This Calculator Enter your age, your measured resting heart rate (taken first thing in the morning), and your target training intensity as a percentage. The calculator applies the Gellish formula for max heart rate, subtracts resting heart rate to get Heart Rate Reserve, then scales HRR by your chosen intensity percentage and adds back resting heart rate to produce your target BPM and all five zone ranges. ## Worked Example: 30-Year-Old, Resting HR 60, 70% Intensity Age 30, resting heart rate 60 bpm, target intensity 70%. Max HR (Gellish): \(207 - 0.7 \times 30 = 186\) bpm. Heart Rate Reserve: \(186 - 60 = 126\) bpm. Target HR: \(126 \times 0.70 + 60 = 148.2 \approx 148\) bpm — this falls right at the Zone 3/Zone 4 boundary (Tempo/Aerobic Endurance moving into Anaerobic Threshold). Full zone breakdown: Zone 1 123-136 bpm, Zone 2 136-148 bpm, Zone 3 148-161 bpm, Zone 4 161-173 bpm, Zone 5 173-186 bpm. ## Related Calculators Estimate your aerobic ceiling with the [VO2 Max calculator](/calculators/vo2-max-estimation-calculator), or plan your session around these zones with the [workout planner](/calculators/workout-calculator). ## Frequently asked questions ### What is Heart Rate Reserve (HRR)? HRR is the difference between your maximum heart rate and your resting heart rate. It represents your heart's working capacity. ### Why does the Karvonen formula include resting heart rate? Including resting heart rate ensures the training zones adjust to your individual cardiovascular fitness. A fitter person with a lower resting heart rate will have different target zones than an untrained peer. ### What is Zone 2 training? Zone 2 training (60-70% intensity) is low-intensity cardiovascular exercise that builds aerobic capacity, increases mitochondrial density, and optimizes fat oxidation. ### How is Max Heart Rate calculated here? We use the Gellish formula: Max HR = 207 - (0.7 * Age), which is clinically shown to be more accurate than the traditional 220 - Age equation. ### How do I accurately measure my resting heart rate? Measure it first thing in the morning, immediately after waking up while still lying in bed, using a heart rate monitor or counting your pulse for 60 seconds. ### Can I use these heart rate zones for cycling? Yes. The zones apply to cardiorespiratory exercise, though cycling max heart rate is often 5-10 beats lower than running max heart rate. ### What is the anaerobic threshold? The anaerobic threshold (Zone 4) is the intensity at which lactic acid begins to accumulate in the bloodstream faster than it can be cleared. ### Why do fit people have lower resting heart rates? Consistent cardiovascular exercise strengthens the heart muscle, allowing it to pump more blood per contraction (higher stroke volume), which reduces the number of beats needed. ### Can I calculate these zones without a heart rate monitor? You can use the Rated Perceived Exertion (RPE) scale, but a heart rate monitor is required for precise tracking. ### What is Zone 5 training used for? Zone 5 training (90-100% intensity) consists of short, high-intensity intervals designed to improve VO2 Max, stroke volume, and anaerobic capacity. ## Related guides - [Heart Rate Zone Training: How to Use Intensity Zones Correctly](https://dothecalculation.com/blog/health/heart-rate-zone-training) — Learn how heart rate zones work, how to estimate target ranges, and how to use zone-based training with the right medical and practical caution. ## Related calculators - [BMR Calculator](https://dothecalculation.com/calculators/bmr-calculator) — Estimate your basal metabolic rate (BMR) and daily calorie needs at rest based on your age, gender, height, and weight for accurate results. - [Metabolic Age Calculator](https://dothecalculation.com/calculators/metabolic-age-calculator) — Estimate your metabolic age by comparing your basal metabolic rate (BMR) to population health benchmarks for your age group. - [One-Rep Max (1RM) Calculator](https://dothecalculation.com/calculators/one-rep-max-calculator) — Estimate your one-rep max from a real working set using the Epley and Brzycki formulas, plus a training percentage table. - [Resting Metabolic Rate Calculator](https://dothecalculation.com/calculators/rmr-calculator) — Calculate the calories your body burns daily at complete rest using proven, science-based metabolic rate estimation models and formulas. - [Metal Detector Target Depth Estimator](https://dothecalculation.com/calculators/metal-detector-depth-calculator) — Estimate the maximum target detection depth for your metal detector based on coil size, frequency, and soil mineral type. - [Average Blood Sugar (A1C) Calculator](https://dothecalculation.com/calculators/a1c-average-blood-sugar-calculator) — Convert an A1C percentage into estimated average glucose (eAG) in mg/dL and mmol/L using the ADA formula. --- _This calculator is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider or physician before starting any new diet, exercise, or health program, or making decisions based on these metrics._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/heart-rate-reserve-karvonen-calculator). Quote freely with attribution and a link to this page._