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Cold Plunge Calc
Stop guessing your cold plunge time. Free & science-backed.
Cold Plunge Calc gives you a safe, personalized plunge time based on your water temperature, experience, and goal — then builds a free 6-week plan toward the ~11 min/week target from Dr. Søberg's research. Every recommendation links to real studies (Harvard Health, PubMed, Cell Reports Medicine). No sign-up, no tracking, no upsells. Your data never leaves your device. Available in 7 languages. 100% free.
Hey Product Hunt! 👋
I built Cold Plunge Calc because I was tired of two things:
Random numbers on social media — "Stay in for 3 minutes!" (Based on what? Whose water temperature?)
"Free" apps that are just funnel pages for $4,000 cold plunge tubs
So I made something different:
⏱️ It calculates your safe time based on your water temperature, experience, and goal
🧪 Every claim links to an actual study (Harvard, PubMed, Cell Reports)
🔒 Your data never leaves your browser. No signup, no tracking
🌐 7 languages, fully free, no paywall
The core insight comes from Dr. Susanna Søberg's research: regular cold-water swimmers naturally accumulate about 11 minutes per week across 2–3 sessions. The app builds you a progressive plan toward that target.
Happy to answer questions! 🧊
About Cold Plunge Calc on Product Hunt
“Stop guessing your cold plunge time. Free & science-backed.”
Cold Plunge Calc was submitted on Product Hunt and earned 4 upvotes and 1 comments, placing #88 on the daily leaderboard. Cold Plunge Calc gives you a safe, personalized plunge time based on your water temperature, experience, and goal — then builds a free 6-week plan toward the ~11 min/week target from Dr. Søberg's research. Every recommendation links to real studies (Harvard Health, PubMed, Cell Reports Medicine). No sign-up, no tracking, no upsells. Your data never leaves your device. Available in 7 languages. 100% free.
On the analytics side, Cold Plunge Calc competes within Health & Fitness, Productivity and Sports — topics that collectively have 748.9k followers on Product Hunt. The dashboard above tracks how Cold Plunge Calc performed against the three products that launched closest to it on the same day.
Who hunted Cold Plunge Calc?
Cold Plunge Calc was hunted by New User. 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.
For a complete overview of Cold Plunge Calc including community comment highlights and product details, visit the product overview.
New User