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Zone 2 Heart Rate Calculator
Find your Zone 2 range using MAF, Karvonen & % Max HR
Most Zone 2 calculators use one formula. This runs all three — MAF, Karvonen, and % of Max HR — simultaneously so you see the full picture. Enter your age, resting heart rate, and fitness level. Get your Zone 2 range three ways, a complete 5-zone training table, weekly volume recommendations, and plain-English explanations. Free. No signup. No email. Built for runners, cyclists, and anyone serious about aerobic base training and longevity.
Hey Product Hunt! 👋
I built this because I kept running into the same frustration — every Zone 2 calculator online picks one formula and gives you a single number, with zero explanation of why different methods produce different results.
MAF, Karvonen, and percentage of Max HR all give different Zone 2 ranges — and they're all "correct" depending on your situation. So I built a tool that runs all three simultaneously and explains the science behind each.
Enter your age, resting heart rate, and fitness level. You get:
→ Zone 2 range calculated three ways side by side
→ Complete 5-zone training table
→ Weekly training volume recommendations
→ Plain-English explanation of each method
Free. No signup. No email. Works on mobile.
Would genuinely love feedback from anyone who trains by heart rate — especially if the numbers feel off for your experience level. Happy to answer any questions about the methodology!
I built this because most Zone 2 calculators felt too simplistic or inconsistent.
This one shows 3 methods side-by-side so you can compare and choose what works best for you.
Curious — how are you currently tracking your Zone 2 training?
Would love your feedback 🙏
About Zone 2 Heart Rate Calculator on Product Hunt
“Find your Zone 2 range using MAF, Karvonen & % Max HR”
Zone 2 Heart Rate Calculator was submitted on Product Hunt and earned 3 upvotes and 2 comments, placing #87 on the daily leaderboard. Most Zone 2 calculators use one formula. This runs all three — MAF, Karvonen, and % of Max HR — simultaneously so you see the full picture. Enter your age, resting heart rate, and fitness level. Get your Zone 2 range three ways, a complete 5-zone training table, weekly volume recommendations, and plain-English explanations. Free. No signup. No email. Built for runners, cyclists, and anyone serious about aerobic base training and longevity.
Zone 2 Heart Rate Calculator was featured in Health & Fitness (82.6k followers), Productivity (650.7k followers) and Sports (11.2k followers) on Product Hunt. Together, these topics include over 159.2k products, making this a competitive space to launch in.
Who hunted Zone 2 Heart Rate Calculator?
Zone 2 Heart Rate Calculator was hunted by Lawrence Goh. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Lawrence Goh