Heart Rate Zone Calculator Explained for Australians
Calculates heart rate training zones using the Karvonen method. This guide walks through what each input means, the formula behind the answer and a worked example using typical Australian figures. You can follow along in the free Heart Rate Zone Calculator.
Why it matters
Australian nutrition labels use kilojoules, alcohol is measured in standard drinks of 10 grams, and health guidance comes from sources such as the NHMRC and Healthdirect. These calculators use common, published formulas as a starting point.
What you need to enter
The calculator asks for 2 inputs. The table shows each one with the example value used later in this guide.
| Input | Example value |
|---|---|
| Age | 35 |
| Resting heart rate (bpm) | 60 |
The formula
Max HR = 220 − age. Zone = resting HR + (max − resting) × intensity.
Worked example
Entering the example values above gives these results:
| Result | Value |
|---|---|
| Maximum heart rate | 185 bpm |
| Zone 2 (60 to 70%) | 135 to 148 bpm |
| Zone 3 (70 to 80%) | 148 to 160 bpm |
| Zone 4 (80 to 90%) | 160 to 173 bpm |
The headline figure is 185 bpm (maximum heart rate). Change any input in the calculator and every result updates instantly, so you can test different scenarios side by side.
How the maximum heart rate changes with age
The table below keeps every other input at the example value and moves only “Age” up and down by 10% and 20%. It shows how sensitive the maximum heart rate is to that one figure.
| Age | Maximum heart rate |
|---|---|
| 28 | 192 bpm |
| 32 | 188 bpm |
| 35 | 185 bpm |
| 38 | 182 bpm |
| 42 | 178 bpm |
At 28 the result is 192 bpm; at 42 it is 178 bpm. If a small change in this input moves the answer a lot, it is worth double-checking that figure before you rely on the result.
A practical tip
The 220 − age formula can be 10 or more beats out. A field test gives a more personal maximum.
Keep going
Before relying on the number, read Heart Rate Zone Mistakes Australians Make and How to Avoid Them. You might also find these guides useful:
- How the Standard Drinks Calculator Works (With a Worked Example)
- Running Pace Calculator: Formula, Example and What the Result Means
- How the BMI Calculator Works (With a Worked Example)
Frequently asked questions
- Are these calculators medical advice?
- No. They provide general information. See your GP or visit healthdirect.gov.au for personal advice.
- Do they work for children?
- No. Adult formulas are used throughout. Children’s growth is assessed differently.
- Where do the formulas come from?
- Each calculator page names the formula used, such as Mifflin-St Jeor for BMR or the US Navy method for body fat.
Run your own numbers in the Heart Rate Zone Calculator.
Open the calculatorGeneral information only. Rates and thresholds change, usually on 1 July. Confirm current figures with the ATO or the relevant authority, and get personal advice for decisions about your situation.