Heart Rate Zone Calculator
Estimate training heart-rate zones from age and resting heart rate using the Karvonen heart-rate-reserve method. The result is an educational estimate based on the selected formula and entered values.
Fill in the required fields to see your result.
Use this calculator on your website
Add this free Heart Rate Zone Calculator to your blog, article, or business website. Copy the embed code and publish it in minutes.
Perfect for blogs, WordPress, Webflow, and business websites.
The primary result summarizes the selected estimate. Supporting outputs expose related values or intermediate calculations.
Need a calculator like this?
Calciro can build a custom calculator around your formulas, pricing rules, or lead-generation process.
How to Use This Calculator
Enter measurements using the units shown. Review the formula, assumptions and limitations before interpreting the result.
Formula & Methodology
The calculator applies the named equation or user-defined factors directly to the inputs. It does not infer medical history, medications, symptoms, laboratory values or individual clinical needs.
Worked example
The calculator uses estimated maximum heart rate minus resting heart rate, then applies percentage bands to that reserve.
Population formulas can be inaccurate for individuals. Results may be affected by measurement error, age, health status, medication, pregnancy, training level, environmental conditions and formula choice.
Educational information only. Not medical advice, diagnosis, treatment, nutrition therapy or an exercise prescription. Do not use the result to delay care or override advice from a qualified professional.
Related Calculators
- Target Heart Rate CalculatorCalculate your target heart rate training zone from your age.
- VO2 Max CalculatorEstimate VO2 max using the Cooper 12-minute run formula from distance covered in meters.
- Macro CalculatorSplit a daily calorie target into protein, carbohydrate and fat grams using editable percentage targets.
- Protein CalculatorEstimate a daily protein intake range from body weight, activity level and goal using editable grams-per-kilogram assumptions.
- Wilks CalculatorCalculate a Wilks score from body weight, total lifted weight and sex using the classic Wilks coefficient formula.
- AP Macroeconomics Score CalculatorEstimate an AP Macroeconomics composite and AP score from MCQ and free-response performance.
Related Guides
- Heart Rate Zone Calculator: Training Zones by Age and Max HRCalculate your five heart rate training zones. Understand what each zone develops, how to find your actual max heart rate, and how zone training improves cardiovascular fitness.
- How One-Rep Max Is Calculated: Formulas, Accuracy & ExamplesCalculate your 1RM from submaximal lifts using Epley, Brzycki, and Lander formulas. Understand which formula is most accurate, and how to use 1RM percentages for training intensity.
- How Running Pace Is Calculated: Pace, Speed & Race Time ExplainedUnderstand how running pace is calculated from speed, how to convert minutes-per-mile to mph, and how to predict race finish times at any distance from 5K to marathon.
- One Rep Max Calculator: How to Estimate Your 1RM SafelyCalculate your one-rep max (1RM) for squat, bench, deadlift, and other lifts using submaximal rep formulas. Covers Epley, Brzycki, and other prediction equations with accuracy notes.
- VO2 Max Calculator: What It Is, How to Estimate It & Why It Predicts LongevityEstimate VO2 max from your running performance or heart rate. Understand why VO2 max is the strongest single predictor of longevity and how to improve it.
Frequently Asked Questions
- What does the Heart Rate Zone Calculator calculate?
- Estimate training heart-rate zones from age and resting heart rate using the Karvonen heart-rate-reserve method.
- Is this a diagnosis, prescription or personalized medical recommendation?
- No. It is an educational estimate based on the values entered and the specific formula described on the page.
- Can the result differ from a professional assessment?
- Yes. Individual physiology, health conditions, medications, measurement error, training status and the chosen formula can materially change the appropriate result.
- When should I seek professional guidance?
- Consult a qualified healthcare or fitness professional before making major changes, especially if you have symptoms, a medical condition, take medication, are pregnant, are under 18 or have a history of disordered eating.
Last updated 7/21/2026