Target Heart Rate Zones for Age 25, Resting HR 55 bpm
A fit 25-year-old with a low 55 bpm resting heart rate will have high training zone ceilings for intense exercise.
How to use this tool
- Enter age and resting heart rate in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your zone 1 low (50%) and the full breakdown beneath it.
Calculate heart rate training zones for a 25-year-old athlete with a resting heart rate of 55 bpm.
Frequently asked questions
- What is the Karvonen formula?
- Karvonen target HR = (Max HR - Resting HR) × intensity% + Resting HR. It gives more personalised zones than simple percentage-of-max because it accounts for your cardiovascular fitness.
- Which zone is best for fat burning?
- Zone 2 (60–70% of max) is the classic fat-burning zone. Higher zones burn more total calories but use a higher proportion of carbohydrates.