Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Health, Fitness & Wellness
Heart Rate Zone Calculator (Karvonen) by Age
Target HR = resting + (max − resting) × intensity (Karvonen).
Find fat-burn, aerobic, and peak zones from age and resting heart rate. Estimates only—not a diagnosis or prescription.
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Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Fat-burn zone = 135–148 bpm. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
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Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Age (years)
Length of the repayment schedule.
Resting HR (bpm)
The “Resting HR (bpm)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Find fat-burn, aerobic, and peak zones from age and resting heart rate. Estimates only—not a diagnosis or prescription. Target HR = resting + (max − resting) × intensity (Karvonen). Example: Age 35, resting 60 bpm → fat-burn zone roughly 132–145 bpm.
Target HR = resting + (max − resting) × intensity (Karvonen).
Example: Age 35, resting 60 bpm → fat-burn zone roughly 132–145 bpm.
When to use this Heart Rate Zone
Common use cases
- Find fat-burn, aerobic, and peak zones from age and resting heart rate.
- Sanity-check with this case: Age 35, resting 60 bpm → fat-burn zone roughly 132–145 bpm.
- The relationship is: Target HR = resting + (max − resting) × intensity (Karvonen).
Localized examples
- Health, Fitness & Wellness: the example on this page uses the same formula as the widget.
What you get
- Fields: Age (years), Resting HR (bpm)
- Target HR = resting + (max − resting) × intensity (Karvonen).
- Example on the page: Age 35, resting 60 bpm → fat-burn zone roughly 132–145 bpm.
How to Calculate Heart Rate Zone Step-by-Step
- 1Enter Age (years), Resting HR (bpm). Use the values you have, not a catalog average, unless that is all you know.
- 2Target HR = resting + (max − resting) × intensity (Karvonen).
- 3Worked case: Age 35, resting 60 bpm → fat-burn zone roughly 132–145 bpm.
- 4If this number would change a drug, a diet, or a return-to-play call, take it to a clinician. The page never examined you.
Governing formula
Target HR = resting + (max − resting) × intensity (Karvonen).
Age 35, resting 60 bpm → fat-burn zone roughly 132–145 bpm.
Example: set Age (years) = 35, Resting HR (bpm) = 60, then read the result.
Variable definitions
- ageYears
Age (years)
The “Age (years)” field. Default 35; typical range 15–90.
- restingHr
Resting HR (bpm)
The “Resting HR (bpm)” field. Default 60; typical range 40–100.
- The formula (Target HR = resting + (max − resting) × intensity (Karvonen).) does not see labs, medications, sleep, or injury history. A clinician does.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Target HR = resting + (max − resting) × intensity (Karvonen).
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Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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